Effects of buried pipe design parameters on performance of ground-source heat pump systems in cold zone

Based on the dynamic simulation software TRNSYS, develops a software to predict the performance of ground-source heat pump (GSHP) systems. Taking the GSHP system in Hezhi railway station of Shanxi province as an example, investigates the effects of buried pipe space and depth on long-term performance of the GSHP system. The results show that the long-term operation of the GSHP system without heat compensation measures in cold zone will gradually decrease the heating capacity and COP of the heat pump unit due to the irreversible decrease of the average soil temperature and increase the unguaranteed hours of heating. Increasing the buried pipe space and depth can decrease the deterioration speed of the average soil temperature and the heating performance of the GSHP system, but can not finally prevent the decrease of system performance.