Dynamic performance of high concentration photovoltaic/thermal system with air temperature and humidity regulation system (HCPVTH)

A high concentration photovoltaic/thermal system with air temperature and humidity regulation system (HCPVTH) is proposed as a means to maximize the utilization of solar energy resources. The HCPVTH consists of several subsystems: high concentrating photovoltaic power generation, thermal storage, absorption heat pump, and heat recovery air regulation. A complete energy conversion model of the HCPVTH is established which includes a photovoltaic efficiency model and waste heat utilization thermodynamics model. Variations in efficiency across the system and subsystems with respect to the PV cell surface temperature reveal the maximum overall HCPVTH efficiency. Meteorological parameters and corresponding inter-subsystem coupling mechanisms are obtained according to changes in subsystem performance indicators with respect to time. We reach a maximum overall efficiency of 49.77% (photoelectric conversion and refrigeration efficiency of 35.15% and 78.25%, respectively), tank water mass changing range of 0.82-17.52 L, and maximum energy-savings of 15.40% in the heat recovery air regulation subsystem when PV cell operating temperature is 101 degrees C, tank capacity is at least 16.7 L, and the air conditioning subsystem is equipped with a heat pipe component. The total provided refrigerating and dehumidifying capacities are respectively 1.189 GJ and 264.907 kg under these conditions. The findings reported in this study may provide guidance for design and operation regulations of each subsystem in HCPVTH.