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Design and energy flexibility analysis for building integrated photovoltaics-heat pump combinations in a house

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  • Gaucher-Loksts, Erin
  • Athienitis, Andreas
  • Ouf, Mohamed

Abstract

This paper considers three configurations of air source heat pumps and building-integrated photovoltaic (BIPV) systems in a solar house. This study evaluates energy efficiency and flexibility when interacting with a smart grid. The reference case is a 5 kW BIPV system on the roof with a separate air-source heat pump water heater (HPWH). In the two more novel options we have: first, a 5 kW BIPV/thermal (BIPV/T) roof system where the heated air from the BIPV/T system is ducted to the air source of the HPWH, which also contains integrated thermal storage (hot water); in the second case we have an attached solarium with a 5 kW semi-transparent photovoltaic façade, with the solar heated air in the solarium connected to the air source of the HPWH with integrated water thermal storage. The three cases are modelled with an explicit finite difference thermal network model, and energy performance is determined and compared over a typical heating season in Montreal, Canada. The energy flexibility potential of the options is compared for different scenarios, such as heating the thermal water storage during the daytime (e.g. using the solar heat in the novel options) and using it for space heating during the time that the grid is under stress (and may have price incentives). Results show that the second novel case utilizing the solarium air as the source of the heat pump resulted in an over 80% energy use reduction relative to the reference. In comparison, the BIPV/T configuration had around 20% reduction compared to the reference case. The tank volume and solarium size had the highest impact on the flexibility of the system. Optimal sizes for the tank volume were typically between 300 and 600 L for the house with a floor area of 116 m2.

Suggested Citation

  • Gaucher-Loksts, Erin & Athienitis, Andreas & Ouf, Mohamed, 2022. "Design and energy flexibility analysis for building integrated photovoltaics-heat pump combinations in a house," Renewable Energy, Elsevier, vol. 195(C), pages 872-884.
  • Handle: RePEc:eee:renene:v:195:y:2022:i:c:p:872-884
    DOI: 10.1016/j.renene.2022.06.028
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    1. Sohani, Ali & Cornaro, Cristina & Shahverdian, Mohammad Hassan & Pierro, Marco & Moser, David & Nižetić, Sandro & Karimi, Nader & Li, Larry K.B. & Doranehgard, Mohammad Hossein, 2023. "Building integrated photovoltaic/thermal technologies in Middle Eastern and North African countries: Current trends and future perspectives," Renewable and Sustainable Energy Reviews, Elsevier, vol. 182(C).
    2. Barone, G. & Vassiliades, C. & Elia, C. & Savvides, A. & Kalogirou, S., 2023. "Design optimization of a solar system integrated double-skin façade for a clustered housing unit," Renewable Energy, Elsevier, vol. 215(C).

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