Performance study of split type ground source heat pump systems combining with solar photovoltaic-thermal modules for rural households in North China

Abstract

Ground source heat pump systems are gradually accepted and used for space heating in winter and air-conditioning in summer for rural households in North China. To keep geothermal equilibrium,a split type ground source heat pump system combining with solar photovoltaic-thermal (STGSHP-PV/T) simulation model is established. The operating performance of the STGSHP-PV/T system has been investigated. Results show that the coefficient of performance (COP) of heat pump units during the heating and cooling period is 3.53 and 2.81, respectively. Except providing spacing heating and cooling for separated rural households, the system offers other accessibility options including power generation and domestic hot water supply. During the operation of STGSHP-PV/T system, thePV panel temperature maintains at a relatively lower operating temperature and higher PV efficiency. The comprehensive performance coefficient of PV/T component is about 66%, and the power generated by PV/T module is greater than that consumed by heat pump units by approximately 1278.1 kWh, which can achieve zero-energy buildings during the whole year. Moreover, the average soil temperature increases gradually under the long term operation of the STGSHP-PV/T system, and the increase rate is 0.12 to 0.26 °C per year, within an acceptable range.