Evaluation of the Performance of a Combined Heat Pump System with a Photovoltaic Collector Integrated with a Roof for a Zero-Energy Building in Tehran

The concept of Zero Energy Building [5] has been introduced globally to reduce energy consumption and carbon emissions in the building sector. Renewable energy systems such as Solar Thermal collectors, Photovoltaic collectors, and Heat Pumps are used to implement ZEBs. This study proposes a Building Integrated Photovoltaic Thermal-Air Source Heat Pump (BIPVT-ASHP) to realize ZEB in a small-scale building. To evaluate the performance of the system, a BIPVT-ASHP hybrid system model was designed, and also the building load model was defined based on the actual building conditions. Then, the heating and cooling performance of the BIPVT-ASHP system was dynamically simulated for one year using TRNSYS software. Then the system was numerically evaluated from energy, economic and environmental perspectives. According to the results of this study, for this system, the initial non-renewable energy consumption was 1.29 kWh/m2 per year, which was less than the heating energy threshold for the ZEB, and the proposed system met well the ZEB conditions. In addition, it was shown that for a given area, photovoltaic/thermal technology leads to a further reduction in non-renewable primary energy consumption but less solar thermal energy production compared to traditional separate production using photovoltaic [2] collectors.