Abstract
To study the increase of energy consumption and soil heat imbalance caused by the performance degradation of solar-assisted ground source heat pumps under long-term heating operation, the TRNSYS simulation platform was used to analyze the solar-assisted ground-source heat pump in series (SGSHPs) systems and ground-source heat pump (GSHP) systems in Shanghai and Lanzhou. Heating performance and total operating energy consumption are investigated. Then, the impact of 20-year long-term operation of the two systems on the changes in the ground temperature environment has been analyzed. The results show that the total energy consumption of the SGSHPs system is 30% lower than that of the GSHP system when the radiation area is 120 m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> and the hole depth is 100 m. Compared with the GSHP system, the coefficient of performance of heat pumps (COPHP) of the SGSHPs system has increased by 4.58% during the 20-year operation, and the ground temperature has been reduced by 21.83%. The hybrid system is more energy-efficient and environmentally friendly.
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