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  • 1.
    Andersson, Adam
    et al.
    Dalarna University, School of Technology and Business Studies, Construction.
    Berggren, Pontus
    Dalarna University, School of Technology and Business Studies, Construction.
    Utvärdering av träbjälklag i ett äldre flerbostadshus med avseende på stegljud och nedböjning: Mätningar och möjliga åtgärder och åtgärdsförslag2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    New buildings will only maginally contribute to future quantity of residential housing. Therefor new knowledge of past building technics are required, to asses which action propsals are suitable when interventions are considered. Objective. This study aims to evaluate lightweight timber joist floors in a multi-story residential building from 1903, with regard to footfall noise and deflection. Method. Data has been collected with a survey and through measurements of footfall noise and deflection. The purpose of the survey is to evaluate the residentals subjective perception of footfall noise and deflection. Footfall noise has been measured with a tapping machine in accordance with Swedish Standards. The deflection has been measured with Leica NA2 paired with a parallel-plate micrometer, GFS1, for precise leveling assessment. Results. The survey shows that the residents don’t experience any issues with regard to footfall noise and deflection. The measurements show a L’nT,w+CI,50-2500 level of 55 dB and an average deflection of 0.320 mm/kN. Conclusion. Footfall noise- and deflection levels satisfy today’s requirements according to Swedish Standards and therefor the results doesn’t motivate any action proposals or interventions.

  • 2. Birchall, Sarah
    et al.
    Gustafsson, Marcus
    Dalarna University, School of Technology and Business Studies, Energy Technology. KTH.
    Wallis, Ian
    Dipasquale, Chiara
    Bellini, Alessandro
    Fedrizzi, Roberto
    Survery and simulation of energy use in the European building stock2016Conference paper (Refereed)
    Abstract [en]

    the work towards increased energy efficiency. In order to plan and perform effective energy renovation of the buildings, it is necessary to have adequate information on the current status of the buildings in terms of architectural features and energy needs. Unfortunately, the official statistics do not include all of the needed information for the whole building stock.

     

    This paper aims to fill the gaps in the statistics by gathering data from studies, projects and national energy agencies, and by calibrating TRNSYS models against the existing data to complete missing energy demand data, for countries with similar climate, through simulation. The survey was limited to residential and office buildings in the EU member states (before July 2013). This work was carried out as part of the EU FP7 project iNSPiRe.

     

    The building stock survey revealed over 70% of the residential and office floor area is concentrated in the six most populated countries. The total energy consumption in the residential sector is 14 times that of the office sector. In the residential sector, single family houses represent 60% of the heated floor area, albeit with different share in the different countries, indicating that retrofit solutions cannot be focused only on multi-family houses.

     

    The simulation results indicate that residential buildings in central and southern European countries are not always heated to 20 °C, but are kept at a lower temperature during at least part of the day. Improving the energy performance of these houses through renovation could allow the occupants to increase the room temperature and improve their thermal comfort, even though the potential for energy savings would then be reduced.

  • 3.
    Blomqvist, Stina
    et al.
    Dalarna University, School of Technology and Business Studies, Construction.
    Helgesson, Robin
    Dalarna University, School of Technology and Business Studies, Construction.
    Framtagning av yttervägg för småhus: En analys med hänsyn till kommande energikrav2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Today is the specific requirements for the building’s energy use in new buildnings. These requirements come under the EU directive to be tightened firmly to the year 2020. This work was the basis of an interpretation of the coming energy requirements, 2020 requirements, designing a new energy-efficient exterior wall construction. This has been done with Fiskarhedenvillan and the construction has been valued in terms of material cost, assembly and the square meter price.

    By calculations and fact finding, demonstrated how energy in small houses could be reduced by replacing the insulating material to a material with lower heat conductivity. The method was to interpret the coming energy requirements and analyze Fiskarhedenvillan current wall construction. Next, search for information and facts about various insulation materials and then design a new proposal on the exterior wall construction.

    The outer wall construction is a crucial factor for the building envelope energy efficiency. Because Fiskarhedenvillan chosen to focus only on the outer wall, this work is delimited to that part of the building envelope.

    An important conclusion of this work is that the 2020 objectives can be met by improving the exterior wall construction and that it is possible to make a design that meets the requirements in entire Sweden

  • 4.
    Dellfjord, Veronica
    Dalarna University, School of Technology and Business Studies, Construction.
    Kunskap hos privatpersoner om fukt på kallvind2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    It is common that homeowners are recommended to add an insulation layer on the attic to lower building heating energy, however many do not realize the problem with complementary insulation compared to what the building and the building shell is adapted for. The lack of knowledge of the homeowners, can result in that they accidentally fill the longitudinal ventilation slits on the cold roof that is there to maintain the natural ventilation and prevent air from drying out any moisture.

    The aim is to find thus out:

    • How much knowledge do the homeowners have about the risk of moisture problems in the cold roof, and how to prevent future moisture damage in the best way, depending on the design of the roof?

    • Is there a risk of moisture problems for the objects studied, based on moisture measurements and high moisture content?

    The method chosen for the study was semi-structured interviews, containing sixteen questions, with homeowners and measurements of relative humidity of air and wood and the moisture content in the wood. The study was limited to the spring of 2016 and to four homeowners.

    It turned out to differ little among the interviewers on how much knowledge they had about moisture in cold roofs and how much knowledge they possess today. Some had enough knowledge to prevent moisture damage while others needed more information. Several felt that the insurance company is where they have to acquire information from, preferably in the form of a leaflet with short questions, sent out annually.

    The measurements proved to give good results with little risk of moisture damage to the cold roofs. There were no high moisture content in neither truss nor inside roof.

  • 5. Eriksson, Anna-Maria
    Energieffektivisering av klimatskal med hänsyn till kulturhistorisk värdering: Fallstudier av tre befintliga småhus från 1900-talet ur bevarandesynpunkt2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Increasingly stringent legal requirements make it difficult to energy efficiency in existing buildings without changing their appearance.

    The purpose of the study is to investigate how much energy, for three existing single-family homes built in the 1900s, which is achievable by improving the building envelope, ie, ceilings, walls, floors, windows and doors, without distorting the building's appearance and while maintaining their cultural values.

    The work consisted of a pilot study where three buildings were identified, a research stage where information about the buildings were developed and an inference stage where energy saving measures proposed were developed and evaluated. Buildings that were good representatives of their time and style sought. Buildings from the 1910s, 1930s and 1970s, was located. Since it was done case studies, interviews and surveys. To investigate the building envelope was conducted U-value calculations and energy calculations of the existing building commitment and buildings based on the proposed policy proposals.

    None of the buildings reached after the proposed action down to the passive house requirement 59 kWh/year/m2 Atemp or BBR requirement 110 kWh/year/m2 Atemp for a building-specific energy consumption. The maximum possible energy efficiency for the three buildings erected during the 1900s, which is achievable without corrupting the buildings' appearance while preserving their cultural values is 13.0 kWh/year/m2 Atemp, 49.7 kWh/year/m2 Atemp respectively 64.8 kWh/year/m2 Atemp.

    Conclusions of the work is that buildings from the 1910's can be addressed by isolating the windows, put one extra door on the inside of the front door and additional insulation in sloping roof. Buildings from the 1930s can be addressed by isolating windows with insulating glass on the inside of the windows and doors with an extra door on the inside of the front door. Buildings from the 1970s can fix the windows by changing them into energy windows, no action on the floor but the facade insulated externally with vacuum insulation. The building from the 1970s fared best in the comparison because it was the authentic condition from the beginning, which meant that the improvement was greater than for example the building from the 1910s that was already rebuilt before action was proposed.

  • 6.
    Gustafsson, Elina
    et al.
    Dalarna University, School of Technology and Business Studies, Construction.
    Persson, Jannika
    Dalarna University, School of Technology and Business Studies, Construction.
    Miljövänliga material i villakonstruktion: En jämförande studie av fyra olika vägg- och vindsbjälklagsförslag gällande miljö och hälsa, med fuktanalys och U-värdesberäkningar.2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Environmental awareness today is larger than ever, and continues to expand. The increasing knowledge has led to a rising demand of using environmental friendly materials and the interest of building and living in a way that is good for the health and environment has grown with it. The small house manufacturer Fiskarhedenvillan, has noticed this demand and that is why this study has been done.

    The purpose of this study is to investigate what opportunities there is to replace one or some of the chosen materials from Fiskarhedenvillans construction to materials that fulfills higher demands at being environment- and healthfriendly. The U-value of the suggestions should be equivalent or improved. The most important aspect otherwise was to investigate how well the new suggestions manage moisture impact. The suggested materials have been windbarrier board, insulation, waterproofing, vapour barrier, tape and interior lining.

    The study was performed by a thorough investigation of the materials that could be of interest. This was done by searching for relevant information through databases, reports, manufacturers homepages and from other construction related books and internet sources. The moisture simulations and U-value calculations were done in the simulation program WUFI pro 5.3. A survey was sent out to Fiskarhedenvillans agents to investigate the housing markets interest in changing to environmental-friendly materials.

    The investigations resulted in four functional suggestions on external wall construction with loft floor, which was chosen based on the purposes. The results show that all constructions successfully handled the moisture exposure, except the wallconstruction with cellulose based insulationboards, where the relative humidity during the whole year stays at such high levels that risk of mould- and moisturedamage is existing. The result of the U-value calculations shows that the suggestions have similar U-value to Fiskarhedenvillans current constructions. However, the proposal with hempinsulation had to be extended 10cm in order to meet this requirement. For the loft floor with hempinsulation it was accepted that the U-value was somewhat lesser than the others. The result from the survey shows that more than half of the agents have experienced a demand from potential customers to change materials to more environment-friendly.

    The most important conclusion is that it is possible to change materials in a house and maintain its construction capacity while managing the impact of moisture as well. Since customers appear willing to pay more for changing materials, we believe that it would not be a problem for Fiskarhedenvillan to establish at least one construction possibility with environmental-friendly materials.

  • 7.
    Gustafsson, Marcus
    Dalarna University, School of Technology and Business Studies, Energy Technology. KTH, Strömnings- och klimatteknik.
    Energy Efficient Renovation Strategies for Swedish and Other European Residential and Office Buildings2017Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The high energy use in the European building stock is attributable to the large share of old buildings with poor energy performance. Energy renovation of buildings is therefore vital in the work towards energy efficiency and reduced environmental impact in the EU. Yet, the strategies and energy system implications of this work have not been made clear, and the rate of building renovation is currently very low.

    The aim of this thesis is to investigate the economic and environmental aspects of energy renovation strategies, with two main objectives:

    • Renovation of Swedish district heated multi-family houses, including life-cycle cost and environmental analysis and impact on the local energy system;

    • Renovation of European residential and office buildings, including life-cycle cost and environmental analysis and influence of climatic conditions.

    Buildings typical for the respective regions and the period of construction 1945-1970 were simulated, in order to determine the feasibility and energy saving potential of energy renovation measures in European climates. A variety of systems for heating, cooling and ventilation were studied, as well as solar energy systems, with focus on heat pumps, district heating, low-temperature heating systems and air heat recovery.

    Compared to normal building renovation, energy renovation can often reduce the life-cycle costs and environmental impact. In renovation of typical European office buildings, as well as Southern European multi-family houses, more ambitious renovation levels can also be more profitable.

    Exhaust air heat pumps can be cost-effective complements in district heated multi-family houses, while ventilation with heat recovery is more expensive but also more likely to reduce the primary energy use. From a system perspective, simple exhaust ventilation can reduce the primary energy use in the district-heating plant as much as an exhaust air heat pump, due to the lower electricity use.

  • 8.
    Gustafsson, Marcus
    et al.
    Dalarna University, School of Technology and Business Studies, Energy Technology. KTH.
    Poppi, Stefano
    Dalarna University, School of Technology and Business Studies, Energy Technology. KTH.
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Energy Technology.
    Fedrizzi, Roberto
    Dipasquale, Chiara
    Bellini, Alessandro
    Ochs, Fabian
    Univeristy of Innsbruck.
    Dermentzis, Georgios
    Univeristy of Innsbruck.
    Performance of Studied Systemic Renovation Packages – Office Buildings2016Report (Other academic)
  • 9.
    Janols, Henrik
    et al.
    Dalarna University, School of Technology and Business Studies, Construction.
    Wik, Tina
    Dalarna University, School of Technology and Business Studies, Construction.
    Nulägesanalys av passivhusbyggande i Sverige 20102012Report (Other academic)
    Abstract [sv]

    Byggsektorn slukar årligen ca 40 % av Sveriges totala energiförbrukning. Nya normer kräver energieffektivare bostäder. Normerna idag fokuserar enbart på driftkostnader och tar inte alls hänsyn till energiförbrukningen och koldioxidavtrycket som själva byggprocessen alstrar. Med höga driftvärden blir energiförbrukningen i byggskedet en liten procent men för passivhus, och ännu högre grad för plusenergihus, som förbrukar ytterst lite energi, blir tillverkningsenergin den avgörande miljöbelastningen. Ny teknik för att uppnå de nya kraven finns i viss utsträckning, men kännedom och kunskap om dem saknas då de fått otillräcklig spridning. En del tekniska lösningar befinner sig fortfarande i en utvecklingsprocess och är inte färdigutvecklade för en större produktion. Ambitionen med denna nulägesanalys och därtill lika inventeringsarbete har varit att fånga in de lösningar och tester som gjorts och ta del av utvärderingarna så att vi kan dra nytta utav dessa i vårt arbete. Denna sammanställning grundar sig på muntlig information vi tagit del av under studiebesöken, ritningar, beskrivningar, protokoll samt rapporter vi samlat in.

    Syfte

    Syftet med vår resa till nedanstående objekt var att ta reda på hur flerfamiljshus med passivhus standard är byggda. Vilka stomval har gjorts och av vilken anledning. Vi ville också ta reda på hur man klarat av täthetskraven i de olika projekten samt hur detta mätts. I många fall verkar det som om utformning och arkitektur glöms bort när man ska bygga passivhus som om passivhuskravet vore så betungande att god utformning inte är förening med det. Därför ville vi också bedöma byggnaderna från arkitektoniska aspekter då dessa är av stor vikt för en bra miljö.

  • 10.
    Joudi, Ali
    Dalarna University, School of Technology and Business Studies, Energy Technology. Linköpings universitet.
    Radiation properties of coil-coated steel in building envelope surfaces and the influence on building thermal performance2015Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Recent studies have shown that the optical properties of building exterior surfaces are important in terms of energy use and thermal comfort. While the majority of the studies are related to exterior surfaces, the radiation properties of interior surfaces are less thoroughly investigated. Development in the coil-coating industries has now made it possible to allocate different optical properties for both exterior and interior surfaces of steel-clad buildings. The aim of this thesis is to investigate the influence of surface radiation properties with the focus on the thermal emittance of the interior surfaces, the modeling approaches and their consequences in the context of the building energy performance and indoor thermal environment.

    The study consists of both numerical and experimental investigations. The experimental investigations include parallel field measurements on three similar test cabins with different interior and exterior surface radiation properties in Borlänge, Sweden, and two ice rink arenas with normal and low emissive ceiling in Luleå, Sweden. The numerical methods include comparative simulations by the use of dynamic heat flux models, Building Energy Simulation (BES), Computational Fluid Dynamics (CFD) and a coupled model for BES and CFD. Several parametric studies and thermal performance analyses were carried out in combination with the different numerical methods.

    The parallel field measurements on the test cabins include the air, surface and radiation temperatures and energy use during passive and active (heating and cooling) measurements. Both measurement and comparative simulation results indicate an improvement in the indoor thermal environment when the interior surfaces have low emittance. In the ice rink arenas, surface and radiation temperature measurements indicate a considerable reduction in the ceiling-to-ice radiation by the use of low emittance surfaces, in agreement with a ceiling-toice radiation model using schematic dynamic heat flux calculations.

    The measurements in the test cabins indicate that the use of low emittance surfaces can increase the vertical indoor air temperature gradients depending on the time of day and outdoor conditions. This is in agreement with the transient CFD simulations having the boundary condition assigned on the exterior surfaces. The sensitivity analyses have been performed under different outdoor conditions and surface thermal radiation properties. The spatially resolved simulations indicate an increase in the air and surface temperature gradients by the use of low emittance coatings. This can allow for lower air temperature at the occupied zone during the summer.

    The combined effect of interior and exterior reflective coatings in terms of energy use has been investigated by the use of building energy simulation for different climates and internal heat loads. The results indicate possible energy savings by the smart choice of optical properties on interior and exterior surfaces of the building.

    Overall, it is concluded that the interior reflective coatings can contribute to building energy savings and improvement of the indoor thermal environment. This can be numerically investigated by the choice of appropriate models with respect to the level of detail and computational load. This thesis includes comparative simulations at different levels of detail.

  • 11.
    Jäderbrink, Erik
    et al.
    Dalarna University, School of Technology and Business Studies, Construction.
    Isaksson, Lena
    Dalarna University, School of Technology and Business Studies, Construction.
    Kostnadseffektivisering av ett lågenergikoncept: En komponentjämförelse för småhus2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The aim of this degree thesis is to investigate and establish how the choice of components such as windows, entrance doors and HRV-units affect the energy demand and operating cost of a detached house.

    The Swedish company Fiskarhedenvillan currently offers two different concepts for detached houses; conventional houses and passive houses which comply with the German Passive House Institute (PHI).   The passive house concept (as set by PHI) puts high emphasis on not just low energy consumption but also on high comfort. With high demands come high investment costs. Fiskarhedenvillan wishes for the concept of the passive house to be modified to a nearly zero-energy building by replacing certified components with non-certified ditto with the intention to lower the investment costs.   The objective of this thesis degree is to develop a more cost efficient low-energy concept compared to the passive house according to PHI and this by making different choices concerning components. Two question formulations were made:

    • By what amount can the investment costs be reduced by changing components and how will the modification affect the energy demand?
    • Is it possible to develop a more cost efficient low-energy concept?

    The comparison research was made by using a control sample, projected to meet the demands set by PHI, as a reference.  A comparison was made by using the planning tool Passive House Planning Package together with data from the control sample. The variation in result between the control sample and the new alternatives was due only to choice of components. 

    The study resulted in two equally cost efficient combinations of components with regard to technical lifespan. Both combinations consist of non-certified windows and entrance doors but have the certified HRV-unit used in the controlled sample. Thus, the most cost efficient alternative consists of both certified and non-certified components.

    Conclusions:

    • The investment cost can be reduced by up to 59,1 % for components or 6,7 % for building kit with new components included. The energy demand increased by11 kWh/m². 
    • It is fully possible to develop a concept that is more cost efficient than Fiskarhedenvillan’s existing low-energy concept.
  • 12.
    Karlsson, Samuel
    Dalarna University, School of Technology and Business Studies, Construction.
    Husgrunders miljöpåverkan: Jämförelse av grundläggningsmetoder för ett småhus2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Buildings affect the environment and climate in many ways, not only during the

    operating stage, but also during production. While buildings are constructed to

    be more energy-effective, a greater share of the buildings total energy demand

    will depend on how the building is produced. Previous studies show that

    buildings with a frame made of wood has substantially lower energy demand and

    greenhouse gas emissions due to production than building frames made of

    concrete. The aim with this report is to investigate the environmental effects due

    to different methods for foundation of a detached house. The main focus is to

    calculate the energy consumption and emissions of carbon dioxide equivalents

    from production of materials. Three different constructions are compared;

    foundation with cellular glass (The Koljern-method), a concrete slab, and a post

    and pier foundation with a wood-based floor. By designing the three

    constructions to be equal in terms of ability to carry the load from a two story

    house 8X12m, and with equal U-values, the comparison is made out of the

    required use of materials. Data for use of energy and CO2e-emissions” from

    cradle to gate” has been taken from declarations on the building products,the

    ICE database and EPD-documents for the various materials. Thereafter, the

    total use of energy and emissions of CO2e has been calculated. Assessments

    from the SundaHus database is also studied to get a more detailed picture of the

    environmental impact and health aspects of the materials.

    The result shows that the post and pier foundation has the lowest use of energy

    in production of the materials and a negative release of greenhouse gas due to

    sequestration. The foundation made of cellular glass has the highest demand of

    energy for producing the materials for the foundation, and a concrete slab has

    the highest emissions of greenhouse gas.

    From estimations made by SundaHus, no further conclusions could be made

    due to the use of environmentally and health restricted materiel. The deduction

    is that the post and pier foundation can be an interesting alternative to reduce

    the carbon footprint from the production of building foundation, but to get a better

    overview a total lifecycle analysis has to be made.

  • 13.
    Knutz, Lars
    Dalarna University, School of Technology and Business Studies, Construction.
    Energibehovsanalys av passiva massivträhus2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis is based on a project which created a test building designed to advance and improve passive houses. The so-called “test building” can help to evaluate different scenarios for moisture transport and tightness. The test building has advanced HVAC systems to control temperature and moisture levels, which makes the test building a good tool to check if theoretical energy calculation formulas match reality.

    The aim of this thesis was partly to investigate how different energy calculation programs match reality and each other, as well as to investigate if the test building fulfills its goal of being classified as a passive house. The method used was based on energy calculations made by hand as well as four different energy calculation programs on the computer. These were compared with each other and with real energy measurements from the test building.

    From the results of the energy calculations the following conclusions could be made; the comparison between the programs shows a difference of up to 12 kWh/m2, yr or 8 % between the highest and lowest results. The electricity consumption of the household and the habits of the inhabitants has a large influence on the result. The comparison between measured energy usage and calculated energy usage is < 15%. Here there is an uncertainty between the weather data used in the calculations and the real weather data. The test building cannot fulfill the claim of a passive house at 150m2 that have a central heating system installed today.

  • 14.
    Kuhn, Tillmann
    et al.
    Fraunhofer ISE.
    Fath, Karoline
    Fraunhofer ISE.
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Energy Technology.
    Gustafsson, Marcus
    Dalarna University, School of Technology and Business Studies, Energy Technology.
    Nouvel, Romain
    ZAFH.
    Fedrizzi, Roberto
    EURAC.
    D2.3 RES availability survey and boundary conditions for simulations2014Report (Other academic)
  • 15.
    Ljungdahl, Therese
    et al.
    Dalarna University, School of Technology and Business Studies, Construction.
    Caroline, Norrström
    Dalarna University, School of Technology and Business Studies, Construction.
    Utveckling av träregelvägg anpassad förframtida energikrav2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Various proposals on wooden joist walls are presented in this report, forFiskarhedenvillan’s standard wall. Boverket has issued a new referral where the energyrequirements for houses has been intensified and become more accurate, depending tothe county and city. The climate zones have been replaced by an adjustment factor.The aim is to develop four new improved wall structures and to do moisture simulations toinvestigate how the constructions are able to be exposed to moisture. The walls should fitinto the company's system solutions.The insulation alternatives that are studied are rock wool and cellulose insulation.Tests are made in the degree thesis to see what would happen if the vapour barrier isreplaced with a thicker OSB and also if the exterior gypsum is replaced by a“Västkustskiva”. Although a thicker construction with cellulose insulation is developed.Calculations and simulations are made to see if the wall structures passed the energyrequirement, depending on house-style and geographical location.Three of Fiskarhedenvillan’s houses were investigated based on two locations, Lund andUmeå.The investigation resulted that all wall structures passed the moisture simulations andalso did the walls pass the coming energy requirements set in Boverket’s referral.Three of the walls has very similar U-value but are different in thickness and insulationmaterials.The conclusion is that the structure of cellulose insulation and OSB got the best results inall areas. The wall:

    • has the lowest U-value, which means a low energy consumption
    • manufactured from recycled materials
    • economically feasible to Fiskarhedenvillan’s customers
  • 16.
    Myhren, Jonn Are
    Department of Fluid and Climate Technology, School of Technology and Health, KTH, Alfred Nobels Allé 10, SE-14152 Huddinge, Stockholm, Sweden.
    Improving the thermal performance of ventilation radiators: The role of internal convection fins2011In: International journal of thermal sciences, ISSN 1290-0729, E-ISSN 1778-4166, Vol. 50, no 2, 115-123 p.Article in journal (Refereed)
    Abstract [en]

    This paper deals with heat output optimization of a ventilation radiator by varying the distribution of vertical longitudinal convection fins. A ventilation radiator, which combines ventilation air supply and heat emission to the room, has a higher driving force on air in between the radiator panels compared to traditional radiators and can for this reason have more heat transferring surfaces to improve thermal efficiency. Improving the thermal efficiency means a lower water temperature is required for heating and energy can be saved in production and distribution of heat in systems with heat pumps, district heating or similar.

    The investigation was made using Computational Fluid Dynamics (CFD) simulations while analytical calculations were used for verification of different flow and heat transfer mechanisms. Results showed that heat transfer can be increased in the section where ventilation air is brought into the room by slightly changing the geometry of the fins, decreasing the fin to fin distance and cutting off a middle section of the fin array. This change in internal design could mean considerable increase in thermal efficiency for the ventilation radiator as a whole.

  • 17.
    Myhren, Jonn Are
    et al.
    Department of Fluid and Climate Technology, School of Technology and Health, KTH, Alfred Nobels Allé 10, SE-14152 Huddinge, Stockholm, Sweden.
    Holmberg, Sture
    Department of Fluid and Climate Technology, School of Technology and Health, KTH, Alfred Nobels Allé 10, SE-14152 Huddinge, Stockholm, Sweden.
    Design considerations with ventilation-radiators: Comparisons to traditional two-panel radiators2009In: Energy and Buildings, ISSN 0378-7788, E-ISSN 1872-6178, Vol. 41, no 1, 92-100 p.Article in journal (Refereed)
  • 18.
    Myhren, Jonn Are
    et al.
    Dalarna University, School of Technology and Business Studies, Construction.
    Holmberg, Sture
    Performance evaluation of ventilation radiators2013In: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, Vol. 51, no 1-2, 315-324 p.Article in journal (Refereed)
    Abstract [en]

    A ventilation radiator is a combined ventilation and heat emission unit currently of interest due to its potential for increasing energy efficiency in exhaust ventilated buildings with warm water heating. This paper presents results of performance tests of several ventilation radiator models conducted under controlled laboratory conditions.

     

    The purpose of the study was to validate results achieved by Computational Fluid Dynamics (CFD) in an earlier study and indentify possible improvements in the performance of such systems. The main focus was on heat transfer from internal convection fins, but comfort and health aspects related to ventilation rates and air temperatures were also considered.

      The general results from the CFD simulations were confirmed; the heat output of ventilation radiators may be improved by at least 20 % without sacrificing ventilation efficiency or thermal comfort.

     

    Improved thermal efficiency of ventilation radiators allows a lower supply water temperature and energy savings both for heating up and distribution of warm water in heat pumps or district heating systems. A secondary benefit is that a high ventilation rate can be maintained all year around without risk for cold draught.

  • 19.
    Nouvel, Romain
    et al.
    ZAFH.
    Cotrado, Mariela
    ZAFH.
    Bertesina, Diego
    Manens.
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Energy Technology.
    Birchal, Sarah
    Fedrizzi, Roberto
    D4.2 Assessed Standardised Energy Generation and Energy Distribution Packages2016Report (Other academic)
  • 20.
    Ochs, Fabian
    et al.
    Univeristy of Innsbruck.
    Fedrizzi, Roberto
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Energy Technology.
    Dermentzis, Georgios
    Univeristy of Innsbruck.
    D6.7 Guidelines on Systemic Approach and Checklist2016Report (Other academic)
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