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Analysis of system improvements in solar thermal and air source heat pump combisystems

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  • Poppi, Stefano
  • Bales, Chris
  • Heinz, Andreas
  • Hengel, Franz
  • Chèze, David
  • Mojic, Igor
  • Cialani, Catia

Abstract

A solar thermal and heat pump combisystem is one of many system alternatives on the market for supplying domestic hot water (DHW) and space heating (SH) in dwellings. In this study a reference solar thermal and air source heat pump combisystem was defined and modelled based on products available on the market. Based on the results of an extensive literature survey, several system variations were investigated to show the influence of heat pump cycle, thermal storage and system integration on the use of electricity for two houses in the climates of Zurich and Carcassonne. A singular economic cash flow analysis was carried out and the “additional investment limit” of each system variation was determined for a range of economic boundary conditions. This is the maximum extra investment cost for the system variant compared to the reference system that will give a break even result for a 10year period. The results show that variations in electricity price affects the additional investment limit far more than the other economic parameters. Several of the variants show potential for achieving a cost benefit, but the potential varies a lot depending on load and climate boundary conditions. For all variants, the biggest difference in electricity savings was found for Zurich rather than in Carcassonne, which is explained by the larger heating load. However, in three cases the largest savings were for the SFH45 house despite the fact that the annual electricity use of the system is much lower than that for the SFH100 house, 3581kWh/year compared to 8340kWh/year. This was attributed to the fact that, in these cases, the operating level of the space heating circuit played a significant role, the SFH45 house being supplied with a 35/30°C heating system while the SFH100 was supplied with a 55/45°C heating system.

Suggested Citation

  • Poppi, Stefano & Bales, Chris & Heinz, Andreas & Hengel, Franz & Chèze, David & Mojic, Igor & Cialani, Catia, 2016. "Analysis of system improvements in solar thermal and air source heat pump combisystems," Applied Energy, Elsevier, vol. 173(C), pages 606-623.
    • Handle: RePEc:eee:appene:v:173:y:2016:i:c:p:606-623
    DOI: 10.1016/j.apenergy.2016.04.048
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    4. Meyers, Steven & Schmitt, Bastian & Vajen, Klaus, 2018. "Renewable process heat from solar thermal and photovoltaics: The development and application of a universal methodology to determine the more economical technology," Applied Energy, Elsevier, vol. 212(C), pages 1537-1552.
    5. Mohanraj, M. & Belyayev, Ye. & Jayaraj, S. & Kaltayev, A., 2018. "Research and developments on solar assisted compression heat pump systems – A comprehensive review (Part-B: Applications)," Renewable and Sustainable Energy Reviews, Elsevier, vol. 83(C), pages 124-155.
    6. Kashani Lotfabadi, Alireza & Hajinezhad, Ahmad & Kasaeian, Alibakhsh & Moosavian, Seyed Farhan, 2022. "Energetic, economic, environmental and climatic analysis of a solar combisystem for different consumption usages with PSI method ranking," Renewable Energy, Elsevier, vol. 197(C), pages 178-196.
    7. Mariusz Szreder & Marek Miara, 2020. "Impact of Compressor Drive System Efficiency on Air Source Heat Pump Performance for Heating Hot Water," Sustainability, MDPI, vol. 12(24), pages 1-17, December.
    8. Zhang, Qunli & Zhang, Lin & Nie, Jinzhe & Li, Yinlong, 2017. "Techno-economic analysis of air source heat pump applied for space heating in northern China," Applied Energy, Elsevier, vol. 207(C), pages 533-542.
    9. Liu, Meng & He, Yueer & Zhang, Huifu & Su, Heng & Zhang, Ziwei, 2020. "The feasibility of solar thermal-air source heat pump water heaters in renewable energy shortage regions," Energy, Elsevier, vol. 197(C).
    10. Cai, Jingyong & Ji, Jie & Wang, Yunyun & Huang, Wenzhu, 2017. "Operation characteristics of a novel dual source multi-functional heat pump system under various working modes," Applied Energy, Elsevier, vol. 194(C), pages 236-246.

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