Feasibility of the performance of thermal photovoltaic systems in residential units in the climate of four cities of Abadan, Baghdad, Basra, and Tehran in terms of energy saving.

In this paper, for the first time, to investigate the potential and feasibility of using PVT-ST in relatively hot and moderate weather conditions, it has been studied in four different cities and compared with two common solar systems, PVT and ST. Therefore, the performance of the system is evaluated in terms of the first and second laws of thermodynamics based on the FORTRAN code, and then using the obtained results to analyze the energy consumption of a residential unit in 4 different cities using Carrier software. In addition, the effects of the mass flow rate of the working fluid, in both laminar and turbulent regimes, on the module performance are investigated. Considering the mass flow rate of 0.0304 kg/s (turbulent regime) in July, the thermal efficiency of ST, PVT-ST, and PVT systems are 85.7%, 78%, and 72.9%, respectively. Finally, the investigation of system performance in different cities shows that this system can produce the highest thermal power in Basra. However, the maximum power generation with an average of 77 watts per square meter belongs to Baghdad. Finally, the energy supply of a residential house by combined systems has been investigated. By considering 8 integrated systems, most of the electricity consumption of a residential house can be supplied, but it should be kept in mind that during the peak hours of consumption if this amount of electricity production does not meet the capacity of the house, a fraction of the electricity shortage can be supplied from the stored electricity.