Operating characteristics of solar energy and GSHP parallel connection hot water system in winter

Using the experimental platform designed by the authors, studies the operating characteristics in winter when the solar radiation is insufficient. The results indicate that the system can satisfy the domestic hot water demand in the student hostel, and the overall efficiency maintains above 4.0, the average COP of the GSHP is 3.0 when the daily running hours are up to 16 in winter. Suggests that it is better to use the GSHP as primary heat source and solar energy as secondary heat source, or only the GSHP as heat source in winter.