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An investigation of energy efficient and sustainable heating systems for buildings: Combining photovoltaics with heat pump
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Fluid and Climate Technology.ORCID iD: 0000-0001-8614-5806
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Fluid and Climate Technology.ORCID iD: 0000-0003-1882-3833
2013 (English)In: Sustainability in Energy and Buildings: Proceedings of the 4th International Conference in Sustainability in Energy and Buildings (SEB´12), Springer Berlin/Heidelberg, 2013, 189-197 p.Conference paper, Published paper (Refereed)
Abstract [en]

Renewable energy sources contribute considerable amounts of energy when natural phenomena are converted into useful forms of energy. Solar energy, i.e. renewable energy, is converted to electricity by photovoltaic systems (PV). This study was aimed at investigating the possibility of combining PV with Heat Pump (HP) (PV-HP system). HP uses direct electricity to produce heat. In order to increase the sustainability and efficiency of the system, the required electricity for the HP was supposed to be produced by solar energy via PV. For this purpose a newly-built semi-detached building equipped with exhaust air heat pump and low temperature-heating system was chosen in Stockholm, Sweden. The heat pump provides heat for Domestic Hot Water (DHW) consumption and space heating. Since selling the overproduction of PV to the grid is not yet an option in Sweden, the PV should be designed to avoid overproduction. During the summer, the HP uses electricity only to supply DHW. Hence, the PV should be designed to balance the production and consumption during the summer months. In this study two simulation programs were used: IDA Indoor Climate and Energy (ICE) as a building energy simulation tool to calculate the energy consumption of the building, and the simulation program WINSUN to estimate the output of the PV. Simulation showed that a 7.3 m2 PV area with 15 % efficiency produces nearly the whole electricity demand of the HP for DHW during summer time. As a result, the contribution of free solar energy in producing heat through 7.3 m2 fixed PV with 23o tilt is 17 % of the annual heat pump consumption. This energy supports 51 % of the total DHW demand.

Place, publisher, year, edition, pages
Springer Berlin/Heidelberg, 2013. 189-197 p.
Series
Smart Innovation, Systems and Technologies, ISSN 2190-3018 ; 22
Keyword [en]
Domestic hot water, PV-HP system, Solar power, Sustainable development
National Category
Building Technologies
Identifiers
URN: urn:nbn:se:kth:diva-123571DOI: 10.1007/978-3-642-36645-1_18Scopus ID: 2-s2.0-84879457927ISBN: 978-364236644-4 (print)OAI: oai:DiVA.org:kth-123571DiVA: diva2:627767
Conference
Sustainability in Energy and Buildings, SEB'12 Stockholm, Sweden 3 - 5 September 2012
Note

QC 20130612

Available from: 2013-06-12 Created: 2013-06-12 Last updated: 2015-07-21Bibliographically approved
In thesis
1. Energy and Indoor Environment in New Buildings with Low-Temperature Heating System
Open this publication in new window or tab >>Energy and Indoor Environment in New Buildings with Low-Temperature Heating System
2013 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The aim of this thesis was to evaluate new buildings with low-temperature heating systems in terms of energy consumption and thermal comfort, and to pay some attention to energy savings and indoor air quality. To reach this aim, on-site measurements as well as building energy simulations using IDA Indoor Climate and Energy (ICE) 4 were performed. Results show that the investigated buildings with low-temperature heating system could meet the energy requirements of Swedish regulations in BBR (Boverkets byggregler), as well as provide a good level of thermal comfort. Implementing variable air volume ventilation instead of constant flow, i.e. decreasing the ventilation air from 0.35 to 0.10 l·s-1·m-2 during the whole unoccupancy (10 hours), gave up to 23 % energy savings for heating the ventilation air. However, the indoor air quality was not acceptable because VOC (volatile organic compound) concentration was slightly above the acceptable range for one hour after occupants arrive home. So, in order to create acceptable indoor air quality a return back to the normal ventilation requirements was suggested to take place two hours before the home was occupied. This gave 20 % savings for ventilation heating. The results of this study are in line with the European Union 20-20-20 goal to increase the efficiency of buildings by 20 % to the year 2020.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. 22 p.
National Category
Engineering and Technology Building Technologies
Identifiers
urn:nbn:se:kth:diva-123566 (URN)978-91-7501-783-9 (ISBN)
Presentation
2013-06-14, Sal B 26, Brinellvägen 23, KTH, Stockholm, 14:00 (English)
Opponent
Supervisors
Note

QC 20130612

Available from: 2013-06-12 Created: 2013-06-12 Last updated: 2013-06-12Bibliographically approved

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Hesaraki, ArefehHolmberg, Sture

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