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  • 301.
    Axelsson Fisk, Jenny
    Dalarna University, School of Technology and Business Studies, Information Systems.
    24-timmars myndigheten, säkerhet, design och definition2003Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    Via Internet kan vi sköta många av våra dagliga rutiner. Vi kan handla, betala räkningar, beställa biljetter till diverse evenemang, resor med mera. Även den offentliga sektorn erbjuder alltfler av sina tjänster elektroniskt. Det största hindret för utvecklingen av elektroniska tjänster är den höga säkerhet som måste ställas på exempelvis identifiering och signering. För denna säkerhet kan med fördel PKI, Public Key Infrastructure, användas. Det är en säkerhetsmetod som innebär att man använder privata och publika nycklar. PKI-tekniken skyddar bra mot avlyssning eftersom identifieringen bygger på att ett slumptal krypteras, och att resultatet därför ser olika ut från gång till gång. Socialtjänsten på Borlänge Kommun har påbörjat utvecklingen av en elektronisk tjänst som kommer att innebära att personer som beviljats ekonomiskt bistånd, ska kunna förnya sin ansökan via Internet. Personen i fråga ska även kunna se de uppgifter som Socialtjänsten har ifrån övriga inblandade myndigheter, samt vika utbetalningar som Socialtjänsten gjort och ska göra till personen. I och med detta exjobb kan Borlänge Kommun visa upp en prototyp som fungerar i stort sett som de vill att den skarpa tjänsten ska göra Sverige är en av pionjärerna i världen att öppna förvaltningen på Internet, och Borlänge kommun har som en av de första kommunerna i Sverige startat utvecklingen av en tjänst i enlighet med "24-timmars myndigheten".

  • 302.
    Axelsson, Henrik
    Dalarna University, School of Technology and Business Studies, Human Geography.
    Kriminalitetens geografi: vardagsbrottslighetens spatiala fördelning i Borlänge2008Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [sv]

    The aim of this thesis is to describe and analyze the geographical distribution of everyday criminality in the town of Borlänge during the year 2002 and to analyze which measures to be taken in the physical social planning to decrease this everyday criminality there. The term everyday criminality is here to be understood as those categories of crime that appear most frequently in the records of reports to the police every year. Here two kinds of crime have been in focus, thefts from cars and office burglary. In fulfilling this aim two main questions have been answered. The first one is how the everyday criminality was distributed geographically in the town of Borlänge during the year 2002. The second one is which measures to be taken in the physical social planning to decrease this everyday criminality in the town of Borlänge. In order to answer the first question a spatial autocorrelation analysis, Local Moran LISA has been used. This method is based on the measurement Moran´s I and shows the spatial autocorrelation for every single location. To answer the second question three different theories of crime prevention through environmental design have been studied and applied in the analysis. These are Jane Jacobs’ ideas about ”the living city”, Oscar Newman´s ideas about ”defensible space” and Ronald V. Clarke´s theories about crime prevention. The major conclusions that can be drawn from this thesis are that the risk of being exposed to thefts from cars, during the analyzed time period, was highest in Centrum and Hagalund and their surroundings. The lowest risk of being exposed to this type of crime was found in Domnarvet and Islingby, during the year 2002. The highest risk of being a victim of the crime office burglary was found in Hagalund and its surroundings and in the single area of Kvarnsveden. The corresponding lowest risk was found in Lergärdet and its surroundings and in Norra Backa and Kupolen. The measures that should be taken in order to decrease these types of criminality can be divided into overall changes and place-specific changes. When it comes to the crime thefts from cars a more attractive central business district, a better view of parking lots from nearby buildings, dividing of larger parking lot zones into smaller ones, migration of hidden parking lots and stronger access control to parking lots where problems with this kind of crime have occurred have been suggested as overall changes. The corresponding place-specific changes are to remove vegetation that is blocking the view, better lighting and to put up signs with information about increased risk of exposure to crime at parking lots with the most problems. To decrease the amount of office burglaries overall changes as to create a better view of the area from nearby surroundings, move bigger office compartments or divide them into smaller units, rebuild characteristic buildings and increase security by strengthening the access control to offices with these kinds of problems could be useful. Finally there are possibilities to decrease office burglary by using place-specific measures as surveillance cameras combined with signs containing information about these, high fences and better lighting around the buildings where a higher risk of being exposed to this kind of criminality is present.

  • 303.
    Axelsson, Jessica
    et al.
    Dalarna University, School of Technology and Business Studies, Graphic Arts Technology.
    Levinsson, Ronja
    Dalarna University, School of Technology and Business Studies, Graphic Arts Technology.
    Barn och föräldrars val av bilderbok med fokus på illustrationer: En intervju- och observationsundersökning2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this study was the comparison of children 3–6 years old and parents’ preferences of picture book illustrations, as well as to examine how parents reason about the choice of picture book and the illustration’s role in this context.

    Through individual semi-structured interviews and observations with 22 children (3–6 years) and 10 parents were examined which types of book illustrations that were preferred. The parents then also choose which of five picture books, from which the illustrations were from, they would like to read to their children.

    The results of the study indicate that the illustrations are an aspect for both children and parents in the selection of picture book and that there are factors that are preferred in the illustrations.

    The children in the study seemed to prefer naivistic illustrations with a high number of focal points. The parents preferred realistic illustrations with elements they can connect to real life.

    Parents considered illustrations, moral and knowledge to be of great importance when choosing a picture book for their children. Many parents wanted the opportunity to tell their own story about the illustrations in the picture books.

  • 304. Axelsson, K.
    et al.
    Eriksson, Owen
    Dalarna University, School of Technology and Business Studies, Information Systems.
    Informationssystemarkitekturer och väginformatik: Rekonstruktion och värdering av två metoder för att skapa informationsarkitekturer inom ITS-området1999Report (Other academic)
  • 305.
    Axelsson, Kajsa
    et al.
    Dalarna University, School of Technology and Business Studies, Business Administration and Management.
    Salminen, Tina
    Dalarna University, School of Technology and Business Studies, Business Administration and Management.
    CSR inom inköp - att välja leverantör: En kvalitativ studie om faktorer som påverkar tillverkande företags val av leverantörer2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Our world faces a number of challenges today, such as climate changes and the lack of human

    rights. As a result of this, the trust towards companies and the engagement of Corporate

    Social Responsibility, CSR, have become an increasingly central department for most companies.

    This is a way for companies to contribute to a better world. By developing business

    solutions in such a way, that the needs of the current world population, are met without compromising

    the conditions for meeting future generations needs. Studies point out that manufacturing

    companies are a key source of the depletion of the world's resources.

    The purpose of this study is to identify which factors affect the choice of the companies suppliers,

    when choosing to work with CSR. The interviews were conducted with four manufacturing

    companies within the Dalarna region.

    The results revealed that CSR is primarily linked to corporate applications of certifications. It

    was found that companies are affected by internal and external factors when choosing a supplier.

    We have identified the company's

    "financial prerequisites" and "image" as two key

    factors that affect the company's choice of supplier when choosing to work with CSR.

  • 306.
    Axelsson, Sandra
    Dalarna University, School of Technology and Business Studies, Economics.
    Sysselsättningseffekter i svenska aktiebolag av införandet av RUT-avdraget: En Difference-in-Differenceanalys2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This work has been done with the purpose to evaluate the employment effects in Swedish limited liability companies from the introduction of the RUT deduction. The RUT deduction was introduced in 2007 and means that individuals can make a tax deduction for various kinds of household work. The data used in this study is annual report data for all Swedish limited liability companies during the years 2000 – 2010, aggregated to the three-digit SNI-code level for all Swedish municipalities. Based on this data the employment effects of the RUT deduction were analyzed using a Difference-in-Difference model. The result shows that the RUT deduction has led to 6930 new jobs created in Swedish limited liability companies in the RUT sector. This means that the RUT deduction has had a positive effect on employment.

  • 307.
    Axelsson, Viktor
    et al.
    Dalarna University, School of Technology and Business Studies, Business Administration and Management.
    Engman, Niklas
    Dalarna University, School of Technology and Business Studies, Business Administration and Management.
    Aktivering av sponsorskap – ur ett föreningsperspektiv: Går föreningar i herrarnas fotbollsallsvenska utöver sponsoravtalen?2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The sports in Sweden and the associations in the league Allsvenskan annually generates millions and millions in sponsorship revenues, in some cases the association capitalize even more than its sponsors. Previous research on sponsorship activation through the perspective of associations is very limited and almost absent. This study is therefore based on previous research from the sponsors perspective and is applied on the perspective of the associations.

    Based on this we have shaped the purpose of the study, which was to get an insight into whether associations in Allsvenskan goes beyond the agreement with activities that can benefit the sponsorship and if so, why. The study has been conducted with a qualitative approach and we have done telephone interviews with respondents from associations in Allsvenskan.

    The result of the study showed that there are indications that associations in Allsvenskan choose to go beyond the agreements and activate the sponsorship. But, the extent of the association´s activation is smaller compared to what extent research suggest that the sponsor should activate. The main reason why the associations choose to activate and go beyond the agreement was to create good and long relationships with their sponsors. In addition to this, we could assume an underlying reason in terms of strengthening the association's own organization and therefore offering a more attractive product on the market.

  • 308.
    Axenstedt, Simon
    et al.
    Dalarna University, School of Technology and Business Studies, Human Resource Management.
    Fredriksson, Karin
    Dalarna University, School of Technology and Business Studies, Human Resource Management.
    Chefers upplevelse av framgång i sitt ledarskap: - Vad chefer på en statlig myndighet upplever som faktorer för att utöva ett framgångsrikt ledarskap.2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The field of leadership is a previously well-explored area, but relatively little research in the subject has concerned Swedish organizations and even less government institutions and authorities.

    In the following study, what managers at a government authority are perceived as factors to exercise successful leadership in their organization are investigated. The study is based on empirical evidence from qualitative interviews with five managers at the State Administration of Transport, Trafikverket. Through this study, a new interview method has also been developed, interactive themed interview. Where the respondent is a part in creating and designing the interview guide.

    In the results of this study, it is found that the investigated managers themselves felt that successful leadership in their organization is based on four factors. These are referred to as relationships, decision making, development and

    authenticity.

    The conclusions that this study can contribute beyond what factors the managers themselves consider generating a successful leadership are also how the managers act to exert what they experience successful leadership, but also what roles a successful leadership includes. That the role of the manager, the role of leader and the role as himself, affects the aforementioned factors, relationships, decision and development, and that the interaction between these roles and factors in various ways affects the managers' degree of perceived success in their leadership. The study also shows that Trafikverket's new leadership philosophy is in line with what managers perceive as contributing factors for the pursuit of successful leadership. And that this new philosophy can help managers to exert more what they themselves experience as a successful leadership.

  • 309.
    Ayadi, Osama
    Dalarna University, School of Technology and Business Studies, Energy and Environmental Technology.
    Measurements, Modelling and Simulations of Thermo Chemical Accumulator used for Solar Cooling2007Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    The demand for cooling and dehumidification of indoor air is growing at a high rate worldwide. Producing cooled air by making use of solar power may seem paradoxical at first sight. However there exist thermal processes to produce coldness, in which water is cooled or air-conditioning is driven directly by a heat input from solar system. The R&D effort to develop solar cooling technologies has increased significantly in the last twenty years. This thesis project is concerned with a new patented small scale solar cooling system, the Thermo Chemical Accumulator (TCA), a technology produced by the Swedish company ClimateWell AB and is available commercially. The work was done both at the Solar Energy Research Centre (SERC) in Borlänge, and at the ClimateWell AB headquarters in Stockholm. In this project, measurements, parameter identification, modelling and parametric study were done in order to develop the Trnsys model of the TCA controller. Measurements established the foundation of the work in this project. It aimed to provide accurate and reliable test data of the performance of the machine that cover the whole range of operating conditions of the machine in reality through a set of well planned and carefully executed experiments. Moreover, two tests were performed to measure the coefficient of performance (COP) of the machine. The previous controller component in Trnsys (Type 214) controls the machine operation relying on the concentration of salt in the machine barrels without taking the operation temperatures into consideration. Obviously this has major drawbacks on the performance of the machine. The new developed controller (Type 216) bases its operation on the temperatures of the machine. A brief parametric study was performed both to ensure that the new developed controller is working properly and to investigate the effect of some operating conditions on the performance of the machine. Results obtained from simulations using the new controller model showed good agreement with measured data. The parametric studies showed that the heat sink temperature has a significant influence on the COP of the machine and that an improvement of the insulation of the machine components could improve the COP of the machine.

  • 310.
    Ayertey, Bliss
    et al.
    Dalarna University, School of Technology and Business Studies, Business Administration and Management.
    Asrat, Getnet Mengesha
    Dalarna University, School of Technology and Business Studies, Business Administration and Management.
    Legitimation Strategies in the reporting of Negative CSR Aspects2017Independent thesis Advanced level (degree of Master (Two Years)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The survival of organizations is dependent upon their legitimacy since legitimacy provides them with access to valuable resources. Organizations do not possess legitimacy, but rather it is ascribed to them by the society they are in when their actions meet societal expectations. Fulfillment of these societal expectations requires the moral and practical obligations of organizations which we call Corporate Social Responsibility (CSR). To show their CSR performance, organizations have increasingly adopted the practice of CSR reporting. In CSR reporting, organizations are expected by their stakeholders to disclose both positive and negative aspects. Although disclosing negative aspects can pose a threat to organization’s legitimacy, a third party reporting them may cause more severe damages to the legitimacy of the organization. Therefore, organizations are motivated to legitimize their negative aspects by using legitimation strategies.

    Using the typology of Coombs and Holladay (1996), in combination with the legitimation strategies by Hahn and Lülfs (2014) as our frameworks, and the non-financial reports of the top ten German chemical companies as our illustrative cases, we investigate and interpret the choice of legitimation strategies used by organizations to report different types of negative aspects in CSR reports. Our findings show that there is a clear pattern in the use of corrective action as a legitimation strategy for all types of negative aspects. Furthermore, we identified instances, where a new type of legitimation strategy, which we called shifting blame legitimation strategy was used. We interpreted our findings using analytical reasoning and theoretical framework such as the concept of symbolic and substantive approach to interpret our findings. Based on the findings, we concluded that the dominant pattern identified falls under the substantive approach, theoretically known for helping companies retain their legitimacy.

  • 311.
    Aygun, Oguzhan
    Dalarna University, School of Technology and Business Studies, Environmental Engineering.
    Solar Cooling2004Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    As the temperature worldwide increases so too will the demand for air conditioning solutions. While it may seem contradictory, the heat of the sun can be effectively used to cool large areas of space in commercial and industrial complexes. As of today, the overall useful conversion of solar thermal energy to cooling is limited to 35%, as the thermal energy collection and the cooling conversion subsystems have capabilities of 50% and 70% respectively. As late as the 1960s though, house comfort conditions were only for the few. From then onwards central air conditioning systems became common in many countries due to the development of mechanical refrigeration and the rise of the standard of living. The oil crises of the 1970s stimulated intensive research aimed at reducing energy costs. Also, global warming and ozone depletion and the escalating costs of fossil fuels over the last few years, have forced governments and engineering bodies in order to re-examine the whole approach to building design and control. Energy conservation, in the sense of fuel saving, is also of great importance. Solar cooling can reduce electricity shortages by reducing peak electrical demand often driven by air conditioning and it is an active solution for reducing pollution and dependence on fossil fuel imports. There are many suitable applications for solar cooling, which include resorts, hospitals, shopping malls, schools, industrial, commercial and residential complexes as well as military bases where utility rates are high and grid connections are unavailable.

  • 312.
    Aylott, Benjamin
    Dalarna University, School of Technology and Business Studies, Energy Technology.
    Techno-Economic Evaluation of Distributed Generation within a Community Smart Grid with Demand Side Response Using HOMER2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In this study the distributed generation of renewable energy, primarily photovoltaic power, and consumption of energy within a geographically dispersed smart grid or ‘virtual micro grid’ is simulated using a model based around the HOMER Pro software with the aim of gaining insight into the economic and environmental performance of the system under different assumptions about the configurations of the generators and the presence of low carbon technologies such as heat pumps and electric vehicles. Demand side response for the purpose of reducing carbon emissions was also investigated as part of this.

    As well as simulating the system within HOMER, the study involved constructing a representative load profile for 200 domestic consumers and other loads using existing data, implementing a model for demand side response, using a range of detailed technical and environmental data to configure the HOMER model, and creating custom plotting tools. These features were connected in a data analysis pipeline written in Python included as part of the submission.

    The study found that to improve the environmental and economic performance of the system increasing the amount of renewable generation should be prioritized over other measures, such as demand side response. PV was the easiest to add due to lower upfront costs (compared to battery storage systems and mid-scale wind turbines) and lower financial and regulatory overheads. Carbon emissions were found to be minimized for around 3.5kW of PV per household in this scenario. Including a single mid-scale wind turbine was found to have the potential to greatly increase renewable penetration, and reduce carbon emissions and the cost of energy due to the complementary nature of PV and Wind power production. Battery storage at low penetrations was found to have little impact, but can make a large impact at high penetration but at significant financial expense.

    A range of battery products was also investigated for their suitability for use within the project and future schemes and were evaluated by locating them in the Renewable Fraction/LCOE plane.

    The inclusion of low carbon technologies such as heat pumps and electric vehicles was found to have some negative impact on the performance where only PV is present in the smart grid with little evidence that it can make better use of the renewable power due to poor matching with the available PV generation.

  • 313.
    Azad, Mohammad
    Dalarna University, School of Technology and Business Studies, Energy Technology.
    Evaluation of an Energy System for multi-family houses with Combination of Exhaust Air Heat Pump and PV: Case Study: Demonstration Building of The EU Energy Matching Project, Sweden-Ludvika2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis investigated application of the heat recovery ventilation using an exhaust air heat pump and a roof top photovoltaic (PV) system for a group of three multi-family houses located in Ludvika, Sunnansjö. The buildings in the existing condition have mechanical ventilation and a centralized heating system consists of a pellet boiler as the main source and an oil boiler as back up.

    Exhaust air heat pump (EAHP) has been known by the previous relevant researches as an effective solution to promote the energy efficiency in the buildings. Furthermore, reduction in PV cost has made the PV as a financially viable option to be contributed in supplying electricity demand.

    In this respect, this thesis aimed to calculate the potential of energy saving in the case study using the combination of EAHP and PV. For this purpose, the buildings and the proposed energy system were simulated to enable the comparison of energy demand before and after the renovation. The simulation was gradually progressed through several phases and each stage created the prerequisites of the next.

    Since the buildings were relatively similar in terms of boundary conditions, one of the buildings were initially modeled and the concluded space heating (SH) demand was extrapolated to the three buildings scope. The simulation of the building was done using 3dimensional thermal model offered by Trnsys3d. The primary results were also calibrated against the available annual fuel consumption data. In the second phase, a pre-developed TRNSYS model of the energy system was completed using the result of previous step as the total SH demand as well as the estimated domestic hot water (DHW) consumption from a stochastic model. This simulation produced the electricity demand profile of the heat pump when the heat pump provided the total heat demand. Subsequently, the electricity consumption of the flats and operational equipment were estimated using stochastic model and available monthly measurement, respectively.

    Since the feasibility and optimal placement of 74 𝑘𝑊 PV modules offered for these buildings had been already examined by the author in another study, the final simulation were performed in an hourly basis considering PV production and total electricity demand; i.e. EAHP, flats consumption and operational equipment.

    The results of the simulation showed that 21 % of total electricity demand during a year could be supplied by the proposed PV system even without any electrical storage, whereas 74 % of total yearly PV production is consumed by the local loads. The results also proved that removing old inefficient oil boiler and supplementing the pellet boiler with the combination of EAHP and PV could mitigate the annual purchased energy (including electricity and pellet) by approximately 40 % compared to the current condition.

  • 314.
    Azizoğlu, Yağız
    Dalarna University, School of Technology and Business Studies, Materials Technology. Luleå University of Technology.
    Modeling of Cold Pilgering of Tubes2017Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Cold pilgering is a challenging tube forming process in terms of modeling due to the complexity in kinematic of tools, friction condition and material behavior. The process development has mostly been based on simple formulas and costly full-scale tryouts. The aim in this study is to develop validated Finite element models of cold pilgering to increase the understanding of influence of the process parameters on the produced tubes.

    In the course of this thesis, three-dimensional mechanical and thermo-mechanical Finite element models of cold pilgering were developed. The commercial code MSC.Marc was used in the simulations. General 3D models are needed to be able to capture asymmetric deformation in cold pilgering. It was found that tool deflections together with elastic deformation of roll dies have considerable influence on the rolling force. Furthermore, the strain rate and temperature effects on the response of the material and thereby on the rolling force were evaluated.

  • 315.
    Azizoğlu, Yağız
    et al.
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Gardsback, M.
    Sjoberg, B.
    Lindgren, L. -E
    Finite element modelling of cold pilgering of tubes2015In: Proceedings of the 8th International Conference on Computational Plasticity - Fundamentals and Applications, COMPLAS 2015, 2015, p. 716-726Conference paper (Refereed)
    Abstract [en]

    Cold pilgering is a cold forming process used during manufacturing of seamless tubes. The tube with a mandrel inside is fed forward and rotated in stepwise increments, while the roll stand moves back and forth. The total plastic deformation of the tube is such that the cross-sectional area of the tube decreases and the length of the tube increases during the process. However, this is performed in many small incremental steps, where the direction of deformation in a material point changes at each stroke. Most published models of cold pilgering use simplified material models. In reality, the flow stress is dependent on temperature, strain rate, strain history and microstructure. In this work, temperature and strain rate distributions are computed, using a 3D thermo-mechanical FE model, and the influence of temperature and strain rate on the rolling force is investigated. The Johnson-Cook model is employed to describe the flow stress using isotropic hardening. The results show that strain rate and temperature have a significant influence on the roll separation force.

  • 316.
    Azizoğlu, Yağız
    et al.
    Dalarna University, School of Technology and Business Studies, Materials Technology. Luleå University of Technology, Department of Engineering Sciences and Mathematics.
    Gärdsback, Mattias
    Sandvik Materials Technology, R&D, Sandviken..
    Sjöberg, Bengt
    Sandvik Materials Technology, R&D, Sandviken..
    Lindgren, Lars-Erik
    Luleå University of Technology.
    Finite element analysis of cold pilgering using elastic roll dies2017Conference paper (Refereed)
    Abstract [en]

    A finite element model of cold pilgering with elastic roll dies have been developed and used to investigate the influence of roll die deformation on the material flow, contact region, roll separating force and tube dimensions. Full scale experiments were performed to validate the contact surface and tube dimensions. The results show that the influence of roll die flattening is not significant on the contact length. However, elastic deformation of roll die has strong influence on both the wall thickness reduction and roll separating force. Thus it is recommended to consider elasticity of roll dies when forces and tube dimensions are estimated.

  • 317.
    Azizoğlu, Yağız
    et al.
    Dalarna University, School of Technology and Business Studies, Materials Technology. Luleå University of Technology.
    Gärdsback, Mattias
    Sjöberg, Bengt
    Lindgren, Lars-Erik
    Finite element modeling of tube deformation during cold pilgering2016In: MATEC Web of Conferences, 2016, Vol. 80, article id 15004Conference paper (Refereed)
    Abstract [en]

    A three-dimensional finite element model of cold pilgering of stainless steel tubes is developed in this paper. The objective is to use the model to increase the understanding of forces and deformations in the process. The focus is on the influence of vertical displacements of the roll stand and axial displacements of the mandrel and tube. Therefore, the rigid tools and the tube are supported with elastic springs. Additionally, the influences of friction coefficients in the tube/mandrel and tube/roll interfaces are examined. A sensitivity study is performed to investigate the influences of these parameters on the strain path and the roll separation force. The results show the importance of accounting for the displacements of the tube and rigid tools on the roll separation force and the accumulative plastic strain.

  • 318.
    Baboš, Pavol
    et al.
    Comenius University, Bratislava, Slovakia.
    Klimplová, Lenka
    Dalarna University, School of Technology and Business Studies, Business Administration and Management.
    Systematically uncoordinated? The Czech Republic and Slovakia in the view of varieties of capitalism2013In: Contemporary European Studies, ISSN 1802-4289, no 1, p. 71-98Article in journal (Refereed)
    Abstract [en]

    Conflict or coordination are the most frequently used words describing the industrial relations in developed economies. What is the relationship between the biggest industrial actors in the former Czechoslovakia and is there any coordination? This paper tries to answer this question focusing on the coordination in the main economic spheres in the Czech Republic and Slovakia. The research is based on the analysis of statistical data and a survey in which a group of experts completed a questionnaire stemming from the Varieties of Capitalism approach. Almost 30 experts representing employers, trade unions and the state from both countries provided insight into the amount of coordination that exists among the main economic actors. Our findings not only undermine the recent classifications of the Central Europe in the Varieties of Capitalism literature, but also show a slightly different institutional setting of the industrial relations in these two post-communist countries. The main results of our research shows that there is an emerging pattern of ‘systematic un-coordination’ among the key spheres of the national economy as defined by Varieties of Capitalism. The authors conclude this article with a discussion regarding the results and limitations of their research.

  • 319.
    Back, Jon
    et al.
    Dalarna University, School of Technology and Business Studies, Graphic/Arts Technology.
    Cross-Rosell, Sandy
    Dalarna University, School of Technology and Business Studies, Graphic/Arts Technology.
    Ungdomars tankar kring betydelsen av färg och form vid framställningen av en internationell webbtidning2001Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    När en grafisk profil för en spännande ny internationell webbtidning för ungdomar skall göras är det viktigt att tänka på hur färg och form påverkar våra känslor. Experiment med färg som har gjorts av ledande färgpsykologer och färgvetare som Goethe, Itten, Lüscher och Karl Ryberg bevisar att färg har en stor psykologisk påverkan på människan. Internet är ett väldigt effektiv kommunikationsmedium och för att kommunicera effektivt är det inte bara orden, utan även färgerna och formerna på webbsidorna som skall vara väl genomtänkta. Vilka färger kopplar ungdomar i Sverige och Chile ihop med vissa känslor? Vilka former kopplas ihop med samma känslor? Svaren på de frågorna sammanställdes och analyserades efter svaren på en enkät om färg och form som delades it till två högstadieskolor i Borlänge, Sverige och en i Santiago, Chile.

  • 320.
    Backlund, Malin
    Dalarna University, School of Technology and Business Studies, Graphic/Arts Technology.
    Marknadsundersökning för företaget hp gällande deras nya koncept, Skylta.nu2004Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    Föreliggande rapport har som syfte att uttyda om det finns ett behov hos marknaden för företaget hp;s koncept, skylta.nu, som innebär att mindre butiker själva ska kunna framställa eget skyltmaterial. För att få underlag för rapporten har en undersökning om företaget hp och deras nya koncept gjorts samt en fördjupning i ämnet marknadsundersökning. Marknadsundersökningen utfördes i form av en enkät och djupgående intervjuer till målgruppen. Målgruppen är satt som mindre butiker i hela landet. För att marknadsundersökningen skall vara möjlig har målgruppen delats in i kluster, en galleria i Stockholm och en galleria i Borlänge. Enkäten är uppdelad i tre kategorier för att respondenten enkelt ska kunna förstå och fylla i den snabbt. Syftet med enkäten är att kunna se hur butiken får sitt skyltmaterial i dagsläget och om det finns behov av hp;s koncept. Antalet utdelade enkäter blev 130 stycken ( 80 i Stockholm och 50 i Borlänge) med ett bortfall på 26 stycken. Totalt insamlade enkäter blev 104 stycken. Resultatet visar att av dessa var 35 % positiva, 38% negativa och 27% var osäkra till hp;s koncept.

  • 321.
    Backollas, Sofia
    Dalarna University, School of Technology and Business Studies, Graphic Arts Technology.
    Färgassociationer i Västvärlden2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    There are quite a few articles that addresses the area of colour associations. Where some focus on what associations certain colours has, while others write about colour combinations or cultural and geographical differences when it gets to colour associations. Then there are articles concerning marketing and colour importance as well.The aim for this thesis was to create an overview of colour associations, because there is quite a bit of literature to be found about this subject. Also, to see which colours that are linked to certain associations, and to highlight the importance of colour in marketing. Eight articles concerning this subject, both scientific and experience-based articles were selected. Thereafter they were analysed and compiled into a table containing the colours associated to certain association. These tables were sorted by positive, negative and gender associations.The conclusion is that an association can contain multiple colours and a single colour can contain multiple associations. Black is often associated with something negative, whereas there are other colours such as orange and green that are solely positive. Something that is important to consider about marketing and colour associations is that colour is dependable in which context it is used. Which means you shouldn’t focus too much on what a single colour is associated with, but instead have in mind what context said colour are to be used in.

  • 322.
    Backollas, Sofia
    Dalarna University, School of Technology and Business Studies, Graphic Arts Technology.
    Färgassociationer i Västvärlden2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    There are quite a few articles that addresses the area of colour associations. Where some focus on what associations certain colours has, while others write about colour combinations or cultural and geographical differences when it gets to colour associations. Then there are articles concerning marketing and colour importance as well.

    The aim for this thesis was to create an overview of colour associations, because there is quite a bit of literature to be found about this subject. Also, to see which colours that are linked to certain associations, and to highlight the importance of colour in marketing. Eight articles concerning this subject, both scientific and experience-based articles were selected. Thereafter they were analysed and compiled into a table containing the colours associated to certain association. These tables were sorted by positive, negative and gender associations.

    The conclusion is that an association can contain multiple colours and a single colour can contain multiple associations. Black is often associated with something negative, whereas there are other colours such as orange and green that are solely positive. Something that is important to consider about marketing and colour associations is that colour is dependable in which context it is used. Which means you shouldn’t focus too much on what a single colour is associated with, but instead have in mind what context said colour are to be used in.

  • 323. Backström, Tomas
    et al.
    Isaksson, Kerstin
    Wilhelmson, Lena
    Dalarna University, School of Technology and Business Studies, Occupational science.
    Moström Åberg, Marie
    Dalarna University, School of Technology and Business Studies, Occupational science.
    Åteg, Mattias
    Dalarna University, School of Technology and Business Studies, Occupational science.
    Önnered, Loe
    Regisserad kompetensutveckling2008In: Nordisk arbetslivsforskningskonferens, Växjö, 2008Conference paper (Other academic)
  • 324.
    Backström, Tomas
    et al.
    School for Innovation, Design and Technology, Mälardalen University, Sweden.
    Köping Olsson, Bengt
    School for Innovation, Design and Technology, Mälardalen University, Sweden.
    Wilhelmson, Lena
    Department of Education, Stockholm University, Sweden.
    Moström Åberg, Marie
    Dalarna University, School of Technology and Business Studies, Occupational science.
    Åteg, Mattias
    Dalarna University, School of Technology and Business Studies, Occupational science.
    The manager´s directing task2011Conference paper (Other academic)
    Abstract [en]

    The manager has great influence over the talks in the workplace. A manager as uses

    the appropriate tools can help employees become more democratic in meetings and

    more receptive to what colleagues are saying. This in turn leads to increased learning

    and better working environment for employees. This is shown in a project with

    twenty managers from different businesses. From the public sector participated

    county council, state administration and municipal activity. From private industry

    participated small service companies, banking, automobile, and an additional

    manufacturing industry. The managers had during a year to participate in eight

    workshops with different themes related to communication and collaboration,

    conducted by researchers from Mälardalen University, Dalarna University and

    Stockholm University (Sweden). The employees were requested to answer

    questionnaires before and after this year, to study the extent to which they have been

    influenced by the fact that managers attended the training.

    The results show that the working groups not only become more competent,

    employees have also been more attached to their work group and working groups

    have also become more involved in decisions regarding their work and workplaces.

    Results point at the importance of the manager to support integrated autonomy among

    the employees who then become responsible and empowered actors.

    The ideal that this project seeks is called integrated autonomy. This means that the

    actor at the same time should be both independent and belonging. Employees and

    work groups, should as far as possible, be permitted and develop competence to

    decide how the work should be carried out. The employees belonging enables the

    decision to be made within the framework of the practices, the culture and the

    objectives that the group and the organization has developed. Belonging is both a

    support to staff and ensures that the action is strongly influenced by the organization.

    The manager task is about providing conditions for interaction and to influence the

    emergence of collective competence and coordination in tune with a changing

    environment. This way of working, we describe as the managers' directing task.

  • 325.
    Backström, Tomas
    et al.
    School for Innovation, Design and Technology, Mälardalen University, Sweden.
    Moström Åberg, Marie
    Dalarna University, School of Technology and Business Studies, Occupational science.
    Köping Olsson, Bengt
    School for Innovation, Design and Technology, Mälardalen University, Sweden.
    Wilhelmson, Lena
    Department of Education, Stockholm University, Sweden.
    Åteg, Mattias
    Dalarna University, School of Technology and Business Studies, Occupational science.
    Manager's task to support integrated autonomy at the workplace: Results from an intervention2013In: International Journal of Business and Management, ISSN 1833-3850, E-ISSN 1833-8119, Vol. 8, no 22, p. 20-31Article in journal (Refereed)
    Abstract [en]

    A new managerial task arises in today’s working life: to provide conditions for and influence interaction between actors and thus to enable the emergence of organizing structure in tune with a changing environment. We call this the enabling managerial task. The goal of this paper is to study whether training first line managers in the enabling managerial task could lead to changes in the work for the subordinates. This paper presents results from questionnaires answered by the subordinates of the managers before and after the training. The training was organized as a learning network and consisted of eight workshops carried out over a period of one year (September 2009–June 2010), where the managers met with each other and the researchers once a month. Each workshop consisted of three parts, during three and a half hours. The first hour was devoted to joint reflection on a task that had been undertaken since the last workshop; some results were presented from the employee pre-assessments, followed by relevant theory and illuminating practices, finally the managers created new tasks for themselves to undertake during the following month. The subordinates’ answers show positive change in all of the seventeen scales used to assess it. The improvements are significant in scales measuring the relationship between the manager and the employees, as well as in those measuring interaction between employees. It is concluded that the result was a success for all managers that had the possibility of using the training in their management work.

  • 326.
    Backström, Tomas
    et al.
    School for Innovation, Design and Technology, Mälardalen University, Sweden.
    Wilhelmson, Lena
    Department of Education, Stockholm University, Sweden.
    Åteg, Mattias
    Dalarna University, School of Technology and Business Studies, Occupational science.
    Köping Olsson, Bengt
    School for Innovation, Design and Technology, Mälardalen University, Sweden.
    Moström Åberg, Marie
    Dalarna University, School of Technology and Business Studies, Occupational science.
    The role of manager in the post-industrial work system.2011In: Studies in Industrial Renewal: Coping with Changing Contexts / [ed] In E. Segelod, K. Berglund, E. Bjurström, E. Dahlquist, L. Hallén & U. Johanson (Eds.),, Västerås: Mälardalen university press , 2011, 1, p. 215-227Chapter in book (Other academic)
  • 327.
    Badel, Mbanga
    Dalarna University, School of Technology and Business Studies, Material Science.
    Optical modes for bistable twisted nematic LCD for welding filter applications2003Independent thesis Advanced level (degree of Master (Two Years))Student thesis
  • 328.
    Badri, Seyed Ali Mohammad
    Dalarna University, School of Technology and Business Studies, Energy and Environmental Technology.
    Simulation of Photovoltaic Panel Production as Complement to Ground Source Heat Pump System2013Independent thesis Advanced level (degree of Master (Two Years)), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    This master thesis presents a new technological combination of two environmentally friendly sources of energy in order to provide DHW, and space heating. Solar energy is used for space heating, and DHW production using PV modules which supply direct current directly to electrical heating elements inside a water storage tank. On the other hand a GSHP system as another source of renewable energy provides heat in the water storage tank of the system in order to provide DHW and space heating. These two sources of renewable energy have been combined in this case-study in order to obtain a more efficient system, which will reduce the amount of electricity consumed by the GSHP system.The key aim of this study is to make simulations, and calculations of the amount ofelectrical energy that can be expected to be produced by a certain amount of PV modules that are already assembled on a house in Vantaa, southern Finland. This energy is then intended to be used as a complement to produce hot water in the heating system of the house beside the original GSHP system. Thus the amount of electrical energy purchased from the grid should be reduced and the compressor in the GSHP would need fewer starts which would reduce the heating cost of the GSHP system for space heating and providing hot water.The produced energy by the PV arrays in three different circuits will be charged directly to three electrical heating elements in the water storage tank of the existing system to satisfy the demand of the heating elements. The excess energy can be used to heat the water in the water storage tank to some extent which leads to a reduction of electricity consumption by the different components of the GSHP system.To increase the efficiency of the existing hybrid system, optimization of different PV configurations have been accomplished, and the results are compared. Optimization of the arrays in southern and western walls shows a DC power increase of 298 kWh/year compared with the existing PV configurations. Comparing the results from the optimization of the arrays on the western roof if the intention is to feed AC power to the components of the GSHP system shows a yearly AC power production of 1,646 kWh.This is with the consideration of no overproduction by the PV modules during the summer months. This means the optimized PV systems will be able to cover a larger part of summer demand compared with the existing system.

  • 329. Bai, Wensong
    et al.
    Holmström-Lind, Christine
    Johanson, Martin
    Dalarna University, School of Technology and Business Studies, Business Administration and Management. Uppsala University; Mid Sweden University.
    Leveraging networks, capabilities and opportunities for international success: A study on returnee entrepreneurial ventures2018In: Scandinavian Journal of Management, ISSN 0956-5221, E-ISSN 1873-3387, Vol. 34, no 1, p. 51-62Article in journal (Refereed)
    Abstract [en]

    By integrating social capital theory with a capability-based view on performance, this paper aims to examine the extent to which returnee entrepreneurial ventures (REVs) gain international performance advantages from the founding entrepreneurs’ experience with international networks. Using data on 200 Chinese REVs, the paper proposes and tests a structural model with a focus on the link between individual entrepreneurs and the subsequent development of firm capabilities. The results provide evidence that it is important that the returnee entrepreneurs have an international social network for the REV to develop an international network capability, which, in turn, mediates the effects on opportunity knowledge and the international performance of the REVs. The findings highlight the concurrent effect of the role of entrepreneurs and organizational learning in internationalization, and they provide an understanding as to the importance of the returnee-specific advantages for the international performance of these firms.

  • 330.
    Bai, Wensong
    et al.
    Uppsala universitet.
    Johanson, Martin
    Dalarna University, School of Technology and Business Studies, Business Administration and Management. Uppsala universitet; Mittuniversitetet.
    International opportunity networks2018In: Industrial Marketing Management, ISSN 0019-8501, E-ISSN 1873-2062, Vol. 70, p. 167-179Article in journal (Refereed)
    Abstract [en]

    Opportunity seeking has become increasingly important for explaining firm internationalization, but our understanding of how opportunity is mediated within international networks is limited. This study probes the concept of network-mediated opportunities and attempts to identify what drives a firm's reception of new international opportunities. Based on the notion of opportunity in the entrepreneurship literature with the network view on internationalization, we bring together the concepts of relationships, networks, capabilities, and opportunity in a structural model, where we hypothesize that network-mediated opportunity is dependent on networking capability. This, in turn, is positively influenced by network closure and relational embeddedness. We test the model on a sample of 200 Chinese firms. The analysis partly supports the model, as we find that networking capability is a mediating factor between relational embeddedness and network-mediated opportunity, but does not mediate the relationship between network closure and network-mediated opportunity; on the other hand, we find a direct relationship between network closure and network-mediated opportunity. The paper ends with a discussion of the results and suggestions for future research.

  • 331.
    Bai, Wensong
    et al.
    Department of Business Studies, Uppsala University.
    Johanson, Martin
    Dalarna University, School of Technology and Business Studies, Business Administration and Management.
    Martín Martín, Oscar
    Public University of Navarre/Uppsala University.
    Knowledge and internationalization of returnee entrepreneurial firms2017In: International Business Review, ISSN 0969-5931, E-ISSN 1873-6149, Vol. 26, no 4, p. 652-665Article in journal (Refereed)
    Abstract [en]

    This study aims to answer whether and how returnee entrepreneurs’ international experience and returnee entrepreneurial firms’ international market knowledge influence these firms’ internationalization. Anchored in a framework combining an entrepreneurial and knowledge-based view, we develop a model and four hypotheses on the relations between returnee entrepreneurs’ international experience, international market knowledge, international market commitment, and level of internationalization of the returnee entrepreneurial firm. Empirical evidence of the proposed model is derived from a recent sample of Chinese returnee SMEs in knowledge-intensive and high-technology industries. The main finding is that returnee entrepreneurs’ international experience nurtures international market knowledge of returnee entrepreneurial firms, which in turn has a positive effect on these firms’ international market commitment and level of internationalization. In terms of theory, the study extends our understanding of returnee entrepreneurial firms by uncovering the role of returnee entrepreneurs’ international experience and returnee firms’ international market knowledge during their initial and early international expansion.

  • 332.
    Bai, Yu
    Dalarna University, School of Technology and Business Studies, Computer Engineering.
    Analysis of Enterprise VoIP Traffic from a Wire line IMS System2009Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    With the rapid development of telecommunication industry, the IP multimedia Subsystem (IMS) could very well be the panacea for most telecom operators. It is originally defined as the core network for 3G mobile systems by the 3rd Generation Partnership Project (3GPP), the more recent development is merging between fixed line network and wireless networkd This report researchs the characteristic of the IMS data and proposes an IMS characterization analysis. We captured the IMS traffic data with 10 tousands users for about 41 hours. By analyzing the characteristics of the IMS, we know that the most important application in the IMS is VoIP call. Then we use the tool designed by Tsinghua University & Ericsson Company to recognize the data, and the results we got can be used to build the traffic models. From the results of the traffic models, I will get some reasons and conclusion. The traffic model gives out the types of session and types of VoIP call. I bring into a concept—busy hour. This concept is very important because it can help us to know which period is the peak of the VoIP call. The busy hour is from 10:00 to 11:00 in the morning. I also bring into another concept—connection ratio. This concept is significant because it can evaluate whether the VoIP call is good when it use IMS network. By comparing the traffic model with other one’s models, we found the different results from them, both the accuracy and the busy hour. From the contract, we got the advantages of our traffic models.

  • 333.
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Energy Technology.
    ClimateWell TDC with District Heat2010Report (Other academic)
    Abstract [en]

    The PolySMART demonstration system SP1b has been modeled in TRNSYS and calibrated against monitored data. The system is an example of distributed cooling with centralized CHP, where the driving heat is delivered via the district heating network. The system pre-cools the cooling water for the head office of Borlänge municipality, for which the main cooling is supplied by a 200 kW compression chiller. The SP1b system thus provides pre-cooling. It consists of ClimateWell TDC with nominal capacity of 10 kW together with a dry cooler for recooling and heat exchangers in the cooling and driving circuits. The cooling system is only operated from 06:00 to 17:00 during working days, and the cooling season is generally from mid May to mid September. The nominal operating conditions of the main chiller are 12/15°C.

    The main aims of this simulation study were to: reduce the electricity consumption, and if possible to improve the thermal COP and capacity at the same time; and to study how the system would perform with different boundary conditions such as climate and load.

    The calibration of the system model was made in three stages: estimation of parameters based on manufacturer data and dimensions of the system; calibration of each circuit (pipes and heat exchangers) separately using steady state point; and finally calibration of the complete model in terms of thermal and electrical energy as well as running times, for a five day time series of data with one minute average data values. All the performance figures were with 3% of the measured values apart from the running time for the driving circuit that was 4% different. However, the performance figures for this base case system for the complete cooling season of mid-May to midSeptember were significantly better than those for the monitoring data. This was attributed to long periods when the monitored system was not in operation and due to a control parameter that hindered cold delivery at certain times. 

  • 334.
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Environmental Engineering.
    Combitest - Initial Development of the AC/DC Test Method2002Report (Other academic)
  • 335.
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Environmental Engineering.
    COMBITEST: a new test method for thermal stores used in solar combisystems2004Doctoral thesis, monograph (Other academic)
  • 336.
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Energy and Environmental Technology.
    Combitst-program manual2000Report (Other academic)
  • 337.
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Environmental Engineering.
    Combitst-program manual2000Report (Other academic)
  • 338.
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Energy and Environmental Technology.
    European resarch school on large scale solar thermal - SHINE2014In: Solar District Heating 2014, Hamburg, Germany, 2014Conference paper (Other academic)
    Abstract [en]

    The Solar HeatIntegration NEtwork (SHINE) is a European research school in which 13 PhDstudents in solar thermal technologies are funded by the EU Marie-Curie program.It has five PhD course modules as well as workshops and seminars dedicated to PhDstudents both within the project as well as outside of it. The SHINE researchactivities focus on large solar heating systems and new applications: ondistrict heating, industrial processes and new storage systems. The scope ofthis paper is on systems for district heating for which there are five PhDstudents, three at universities and two at companies. The PhD students allstarted during the early part of 2014 and their initial work has concentratedon literature studies and on setting up models and data collection to be usedfor validation purposes. The PhD students will complete their studies in2017-18.

  • 339.
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Environmental Engineering.
    Generic System #11: Space Heating Store with DHW Load Side Heat Exchanger(s) and External Auxiliary Boiler (Advanced Version). A Technical Report of IEA-SHC Task 26 Solar Combisystems2002Report (Other academic)
  • 340.
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Environmental Engineering.
    Generic System #12: Space Heating Store with DHW Load Side Heat Exchanger(s) and External Auxiliary Boiler (Advenced Version). A Technical Report of IEA-SHC Task 26 Solar Combisystems (system description, modelling, sensitivity, optimisation2002Report (Other academic)
  • 341.
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Environmental Engineering.
    Internationell utveckling av solvärmekombisystem - Slutrapport för projekt Formas 2001-0227 & 2001-1964. Deltagande i IEA-SHC Annex 26 Solar Combisystems2003Report (Other academic)
  • 342.
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Energy and Environmental Technology.
    Parameter identification manual for TRNSYS models at SERC2001Report (Other academic)
  • 343.
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Environmental Engineering.
    PARAMETER IDENTIFICATION MANUAL FOR TRNSYS MODELS AT SERC2001Report (Other academic)
  • 344.
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Environmental Engineering.
    Renewable energy education: Report from a field trip to Melbourne, Australia, and short visits to India and New Zealand During Nov/Dec 19921993Report (Other academic)
    Abstract [en]

    During November and December 1992 I visited several groups involved with renewable energy, most of them dealing with education. These groups and their work are described briefly in this report. The groups in Melbourne, Australia have come a long way with education in this field and we have a lot to learn from them. Government funding is needed for large scale work, but useful work can still be done at the community level with much smaller budgets.

  • 345.
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Energy and Environmental Technology.
    ”Röriga” förluster i solvärmesystem2011In: Energimagasinet, ISSN 0348-9493, Vol. 2011, no 1, p. 42-43Article in journal (Other academic)
    Abstract [sv]

    Villaägare med solvärme i kombination med annan värmekälla är nöjda med sina installationer. Solvärmekretsarna är väl installerade men ägarna och installatörerna är ovetandes om att det finns stora förluster i andra delar av systemen.

  • 346.
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Energy and Environmental Technology.
    Slutrapport för EU-projekt Combisol P30784-12011Report (Other academic)
  • 347.
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Energy and Environmental Technology.
    Slutrapport för EU-projekt SolNET P22416-12010Report (Other academic)
    Abstract [sv]

    SolNET var den första europeiska forskarskolan för termisk solvenergi med 10 doktorander, där sju gemensamma doktorandkurser utvecklades och genomfördes under projektets gång. Projektet stöddes av EU-programmet Marie-Curie från juni 2006 till maj 2010. Centrum för solenergiforskning SERC vid Högskolan Dalarna deltog med en doktorand, Janne Paavilainen. SERC genomförde den första av doktorandkurserna, om dynamisk systemsimulering. 30 studenter deltog från 16 länder varav 22 var doktorander och tre var från industri. Under 2007 genomförde Paavilainen en teknoekonomisk utvärdering av mellanstora pellet- och solvärmesystem för närvärme som presenterades vid konferensen Eurosun 2008. Resultaten visar under vilka förutsättningar som solvärme kan vara ekonomisk lönsamt i närvärmesystem i Sverige och Finland. Paavilainen har varit medförfattare till en tidsskriftsartikel om SERCs simuleringsmodell för pelletspannor och –kaminer samt varit medförfattare till två tidsskriftsartiklar tillsammans med SPF (Schweiz) och TU Graz (Österrike) om en ny pannmodell för gas, olja och pellets. Dessa två validerade modeller i programmet TRNSYS används nu rutinmässigt i Sverige av SP och SERC och i Europa av ett flertal forskargrupper. Den nya pannmodellen som utvecklades med SPF och TU Graz har också införlivats i programmet Polysun som används av flera hundra användare runt hela världen, inkl. SERCs magisterstudenter.

  • 348.
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Environmental Engineering.
    Solar Cooling and Storage with the Thermo-Chemical Accumulator2006In: Eurosun 2006, Glasgow, UK, 2006Conference paper (Other academic)
    Abstract [en]

    The Thermo-Chemical Accumulator, a three-phase chemical heat pump with integral thermal storage, has been tested and modelled in the TRNSYS simulation environment. Base case system models for solar cooling applications were created for the Madrid and Stockholm climates and a number of parametric studies were carried out. The results show that the temperature lift, partially dependent on state of charge, is a limiting factor. For a purely sensible cooling load, wet cooling is required for the Madrid climate, whereas in Stockholm a dry cooler can be used for the simulated office and hotel. Dehumidification is not possible. It was shown that the machine itself has sufficient thermal storage for the office load but that it limited the solar fraction for the more uniform hotel load.

  • 349.
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Energy and Environmental Technology.
    Suggested Contents for Training on Solar Combisystems for Installers2011Report (Other academic)
  • 350.
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Environmental Engineering.
    Thermal Storage With The Thermo-Checmical Accumulator (TCA)2006In: Ecostock 2006, Pomona, NJ, USA, 2006Conference paper (Refereed)
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