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Simulation of the thermal interaction between a building integrated photovoltaic collector and an airsource heat pump

Abstract : The number of buildings simultaneously equipped with air-source heat pumps and photovoltaic collectors is constantly increasing. Nevertheless, both systems are installed independently, and their thermal interaction is not taken into account. In addition to electricity, the photovoltaic collector produces heat which can be used to increase the temperature of the source of the heat pump, thus improving its COP (Coefficient Of Performance). Inversely, the fluid cooled by the external unit of the heat pump can be used to lower the operating temperature of the photovoltaic collector, improving its electrical efficiency.
This paper presents the methodology employed to simulate this kind of system and gives some results. The two systems (heat pump and photovoltaic collector) have been modelled and implemented in a thermal simulation tool of buildings. The resulting software enables to take into account the thermal interaction between each physical object (heat pump, PV collector and building) in a dynamic way. Simulations are run for the whole year and with a time step of one hour.
The aim of this development is to evaluate the increase of efficiency of the combined system installed in a building compared to the case where both systems are installed independently. The simulation tool is applied on a case study : a single family house with a living area of 135 m2 and recently renovated. The south oriented roof gives enough space to install a 30 m2 photovoltaic collector. The external unit of the heat pump is installed in the attic just beneath the PV collector, which preheats the incoming air. The results illustrate how the thermal interaction between both systems can be taken into account.
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Submitted on : Tuesday, March 8, 2011 - 3:33:56 PM
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Bruno Filliard, Alain Guiavarch, Melda Jabbour. Simulation of the thermal interaction between a building integrated photovoltaic collector and an airsource heat pump. CISBAT 2009 - Renewables in a changing climate : from nano to urban scale, Sep 2009, Lausanne, Switzerland. pp.555-560. ⟨hal-00574652⟩

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