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  • 151. Thür, A.
    et al.
    Breidler, J.
    Letz, T.
    Pradier, G.
    Cholin, X.
    Papillon, P.
    Albaric, M.
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Energy and Environmental Technology.
    Heier, Johan
    Dalarna University, School of Technology and Business Studies, Energy and Environmental Technology.
    Mette, B.
    Ullman, J.
    Nielsen, J E
    D5.2 : Uniform Documentation of the Evaluated Solar Combisystems2011Report (Other academic)
  • 152. Thür, A.
    et al.
    Letz, T.
    Pradier, G.
    Cholin, X.
    Papillon, P.
    Albaric, M.
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Energy and Environmental Technology.
    Mette, B.
    Ullman, J.
    Nielsen, J E
    D2.1 : Criteria for Best Practice2011Report (Other academic)
  • 153. Thür, A.
    et al.
    Letz, T.
    Pradier, G.
    Papillon, P.
    Cholin, X.
    Albaric, M.
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Energy and Environmental Technology.
    Mette, B.
    Ullman, J.
    Nielsen, J E
    D2.3 : Guidelines for Design and Dimensioning2011Report (Other academic)
  • 154. Thür, Alexander
    et al.
    Furbo, Simon
    Fiedler, Frank
    Dalarna University, School of Technology and Business Studies, Environmental Engineering.
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Environmental Engineering.
    Development of a Compact Solar Combisystem2006In: Eurosun 2006, Glasgow, UK, 2006Conference paper (Other academic)
    Abstract [en]

    Within the frame of the project REBUS, "Competitive solar heating systems for residential buildings", which is financed by Nordic Energy Research, a new type of compact solar combisystem with high degree of prefabrication was developed. A hydraulic and control concept was designed with the goal to get highest system efficiency for use with either a condensing natural gas boiler or a pellet boiler. Especially when using the potential of high peak power of modern condensing natural gas boilers, a new operation strategy of a natural gas boiler/solar combisystem can increase the energy savings of a small solar combisystem by about 80% compared to conventional operation strategies.

  • 155. Udomsri, Seksan
    et al.
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Energy and Environmental Technology.
    Martin, Andrew
    Martin, Viktoria
    Decentralised cooling in district heating network: Monitoring results and calibration of simulation model2011In: Energy and Buildings, ISSN 0378-7788, E-ISSN 1872-6178, Vol. 43, no 12, p. 3311-3321Article in journal (Refereed)
    Abstract [en]

    This article presents the monitoring results of a thermally driven chiller (TDC) driven by district heat from a network supplied by a centralised combined heat and power (CHP) fired with municipal waste. The main objective of this article is to analyse the monitoring results obtained from the demonstration and calibrate a system model that is later used for parametric studies in order to find improved system design and control. The calibration of the system model was made in three stages and all the energy performance figures were within 4% of the measured values. Results show that the TDC system is capable of providing maximum thermal and electrical COP's of 0.50 and 4.6 respectively during the hottest period. For the complete monitoring period during the summer of 2008, the figures were 0.41 and 2.1. The lower figures were due to continuous pump operation inside the TDC even during periods of no cold production and a period when no cold was produced. However the internal pumps inside the TDC have been removed in the new version TDC to increase the electrical COP. System simulation and parametric studies will be employed to further determine how the electrical COP can be improved.

  • 156. Udomsri, Seksan
    et al.
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Energy and Environmental Technology.
    Martin, Andrew R.
    Martin, Viktoria
    Decentralized cooling in district heating network: system simulation and parametric study2012In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 92, p. 175-184Article in journal (Refereed)
    Abstract [en]

    This paper presents system simulation and parametric study of the demonstration system of decentralized cooling in district heating network. The monitoring results obtained from the demonstration were calibrated and used for parametric studies in order to find improved system design and control. This study concentrates on system simulation studies that aim to: reduce the electricity consumption, to improve the thermal COP's and capacity if possible; and to study how the system would perform with different boundary conditions such as climate and load. The internal pumps inside the thermally driven chiller (TDC) have been removed in the new version TDC and implemented in this study to increase the electrical COP. Results show that replacement of the fourth with the fifth generation TDC increases the system electrical COP from 2.64 to 5.27. The results obtained from parametric studies show that the electrical and thermal COP's, with new realistic boundary conditions, increased from 2.74 to 5.53 and 0.48 to 0.52, respectively for the 4th generation TDC and from 5.01 to 7.46 and 0.33 to 0.43, respectively for the 5th generation TDC. Additionally the delivered cold increased from 2320 to 8670 and 2080 to 7740 kWh for the 4th and 5th generation TDC's, respectively. (C) 2011 Elsevier Ltd. All rights reserved.

  • 157.
    Wallinder, Maria
    et al.
    Dalarna University, School of Technology and Business Studies, Energy Technology.
    Perman, Karin
    Dalarna University, School of Technology and Business Studies, Energy Technology.
    Causse, Emmanuelle
    Schröpfer, Veronika
    Gyori, Gabriella
    Grauer, Marlene
    Mohammadi, Max
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Energy Technology.
    Gustafsson, Marcus
    Dalarna University, School of Technology and Business Studies, Energy Technology.
    Report on Non-Technical Barriers to the market placement2016Report (Other academic)
    Abstract [en]

    The iNSPiRe project addresses the need for energy efficiency measures by focussing on making so called deep renovations using multifunctional, industrialised kits in order to speed up the on-site installation process and reduce costs. Energy renovation investment is a multi-factor decision and many of these factors are not technical, which is why this report analyses the non-technical barriers to this investment decision. The study focusses on the kits developed within the iNSPiRe project, but many of the findings are relevant for other single stage deep renovation projects. Both the planning and implementation phases are considered. The aim was to develop suggestions for overcoming these non-technical barriers so that the iNSPiRe kits can more easily be deployed in the market.

    The report is based on a study of policy documents, the experiences of European umbrella organisations for architects, property owners and local governments as well as on a large number of in-depth interviews with relevant stakeholders. Many of the 60 participants were made in conjunction with stakeholder workshops that were organised for specific focus groups such as architects, private property owners, public procurers and the stakeholders of the European Housing Forum. The non-technical barriers have been split into economic, political and social barriers, with most interviewed stakeholders emphasising the economic aspects.

    Subsidies are considered by most as essential for property owners to take the decision to make a deep renovation, but stability of the subsidy programs is essential to have a good impact. Low-interest loans are not as favoured. Other key economic issues are the increase in the asset value of the property after such a renovation and the green value of the resulting low energy building. These are both difficult to quantify, partly due to the fact that such renovated buildings are not as yet so common, and vary in the different property markets.

    The EU has many policies on energy efficiency that are relevant for renovation of buildings, with the 2010 Energy Performance of Buildings Directive (EPBD recast) and the 2012 Energy Efficiency Directive (EED) being the most important. Many member states were late in implementing these and most have problems with forcing compliance with them. National tenancy laws can also make energy renovations difficult by restricting the possibility of raising rents for. For the iNSPiRe kits, regulations and standards are seen as a barrier in the short term as the kits combine several different functions into one product that are covered by several different regulations and/or standards.

    The social barriers are mostly concerned with the tenants, while architectural considerations are also important. In buildings with owner-occupied flats, the decision process for renovation is difficult and even more so when deep renovation is to be considered. In rental properties the owners and tenants have different interests and incentives, leading to possible conflicts. All have uncertainties about the use of multifunctional kits and how well they will perform technically as well as about how much they will save economically.

    The report makes a number of suggestions for overcoming these barriers. Especially important for the iNSPiRe kits is training of relevant installers and planners and use of Life Cycle Cost calculations to show the expected benefits over the lifetime of the products.

    In each section of the report, in addition to the analysis of the specific barrier, there are sections with specific comments from the interviewed stakeholders.

  • 158. Wang, Xinru
    et al.
    Xia, Liang
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Energy Technology.
    Zhang, Xingxing
    Dalarna University, School of Technology and Business Studies, Energy Technology.
    Copertaro, Benedetta
    Dalarna University, School of Technology and Business Studies, Energy Technology.
    Pan, Song
    Wu, Jinshun
    A systematic review of recent air source heat pump (ASHP) systems assisted by solar thermal, photovoltaic and photovoltaic/thermal sources2020In: Renewable energy, ISSN 0960-1481, E-ISSN 1879-0682, Vol. 146, p. 2472-2487Article in journal (Refereed)
  • 159.
    Win, Kaung Myat
    et al.
    Dalarna University, School of Technology and Business Studies, Energy and Environmental Technology.
    Persson, Tomas
    Dalarna University, School of Technology and Business Studies, Energy and Environmental Technology.
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Energy and Environmental Technology.
    Particles and gaseous emissions from realistic operation of residential wood pellet heating systems2012In: Atmospheric Environment, ISSN 1352-2310, E-ISSN 1873-2844, Vol. 59, p. 320-327Article in journal (Refereed)
    Abstract [en]

    Gaseous and particulate emissions from six residential wood pellet heating systems are determined at a realistic six day operation sequence. The study aims to investigate the total emissions from a realistic operation of the heating systems including start-up and stop phases. Five combined solar and pellet heating systems and one reference boiler without solar system with an integrated DHW preparation was tested in a laboratory at realistic operation conditions. The investigated emissions comprised carbon monoxide (CO), nitrogen oxide (NO), total organic carbon (TOC) and particulate matter (PM2.5). In this study, the emissions are presented as accumulated total emissions from the whole six days period and the emissions from start-up and stop phases are also presented separately to evaluate the influence of the emissions from these phases on the total emissions. Emission factors of the measured systems from the six day period are between 192 and 547 mg MJ1 for the CO emissions, between 61 and 95 mg MJ1 for the NO, between 6 and 45 mg MJ1 for the TOC, between 31 and 116 mg MJ1 for the particulate matter and between 2.1 × 1013 and 4 × 1013 for the number of particles. The emissions from the start-up and stop phases are significantly high for the CO (63–95 %) and the TOC (48–93 %). NO and particles emissions are shown to dominate during stationary operation. However, 30–40 % of the particle emissions arise from the start and stop periods. It is also shown that the average emissions of CO, TOC and particles under the realistic annual conditions were higher than the limit values of two eco labels.

  • 160. Yazdanshenas, Eshagh
    et al.
    Furbo, Simon
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Energy and Environmental Technology.
    Theoretical comparison between solar combisystems based on bikini tanks and tank-in-tank solar combisystems2008In: Eurosun 2008, Lisbon, 2008Conference paper (Other academic)
    Abstract [en]

    Theoretical investigations have shown that solar combisystems based on bikini tanks for low energy houses perform better than solar domestic hot water systems based on mantle tanks. Tank-in-tank solar combisystems are also attractive from a thermal performance point of view. In this paper, theoretical comparisons between solar combisystems based on bikini tanks and tank-in-tank solar combisystems are presented. The investigations are carried out for different designs and sizes of the two solar heating system types installed in different houses. The investigations show which types of solar combisystems are suitable for low energy houses, new houses built according to the building codes and old houses.

  • 161. Yong, Lim Say
    et al.
    Bales, Chris
    Dalarna University, School of Technology and Business Studies, Environmental Engineering.
    Design and fabrication of a portable Fresnel reflector2006In: Eurosun 2006, Glasgow, UK, 2006Conference paper (Other academic)
    Abstract [en]

    This paper presents a feasibility study of a portable Fresnel reflector that was designed and constructed using inexpensive materials and then tested. An aluminium plastic laminated reflector was chosen for its cost, reflectance and flexibility. The prototype Fresnel reflector had nine rings of 5 cm width held in place by a lightweight wooden construction, giving a diameter of 1.05 m. All rings and wooden holders can be assembled and disassembled and be stored in a small bag. In the tests, a piece of steel was used as receiver. Two different types of surface on the receiver were tested, namely Maxorb sheet and black paint. The tests showed that the Maxorb achieved a stagnation temperature of above 500 °C while the black paint achieved less than 400 °C. The optical efficiency for both was 0.26. Moreover, the collector could remain unadjusted for a duration of 35 minutes without the receiver temperature dropping lower than 300°C at the center.

  • 162.
    Bales, Chris (Editor)
    Dalarna University, School of Technology and Business Studies, Energy Technology.
    Engineering tools2010Report (Other academic)
    Abstract [en]

    The aim of this report is to give an overview of the results of Work Package 5 “Engineering Tools”. In this workpackage numerical tools have been developed for all relevant CHCP systems in the PolySMART demonstration projects (WP3). First, existing simulation platforms have been described and specific characteristics have been identified. Several different simulation platforms are in principle appropriate for the needs in the PolySMART project. The result is an evaluation of available simulation and engineering tools for CHCP simulation, and an agreement upon a common simulation environment within the PolySMART project. Next, numerical models for components in the demonstration projects have been developed. These models are available to the PolySMART consortium. Of all modeled components an overall and detailed working principle is formulated, including a parameter list and (in some cases) a control strategy. Finally, for four CHCP systems in the PolySMART project, a system simulation model has been developed. For each system simulation a separate deliverable is available (D5.5b to D5.5e) These deliverables replace deliverable 5.4 ‘system models’. The numerical models for components and systems developed in the Polysmart project form a valuable basis for the component development and optimisation and for the system optimisation, both within and outside the project. Developers and researchers interested in more information about specific models can refer to the institutes and contact persons involved in the model development. 

1234 151 - 162 of 162
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