Solar assisted dual tank heat pump application for a residential house

In this study, a solar assisted double tank heat pump system was designed, then modeled and simulated with TRNSYS program. This system is based on the principle that a water source heat pump transfers the heat from the water, which in cold water tank, to the water, which in hot water tank. Also, a PV/T collector is integrated in the system to reduce energy costs and to benefit from solar heating in winter. Using this designed system, it is aimed to heat a restaurant in winter and to meet the domestic hot water requirement, and to cool and to meet the domestic hot water requirement the same place in summer. Performance analysis of the system was carried out for 5 different provinces in Turkey. The effects of different parameters such as water flow rates, tank volumes, PV/T collector surface area were investigated for optimum system design with minimum energy consumption. According to the simulation results, the most energy consuming part in the system is the heat pump, which is more often used in hot climates. There is a direct correlation between the increase of PV/T collector surface area and, SPF and FER values. The number of PV/T modules should be determined by considering the initial investment cost and operating costs. The highest SPF and BEO values were found for İzmir 2,65 and 0,65; while the lowest SPF and BEO values were found 1,74 and 0,39 for Hakkari. Increasing the volume of cold/hot water tank has been found to adversely affect system performance. With the increasing tank volume, it has been seen that auxiliary heaters are activated more and reduce the system efficiency.