Sustainability Study on the Ground-Coupled Heat Pump System with and without Air-Soil Seasonal Thermal Storage in Severe Cold Areas

摘要

In order to investigate the feasibility of groundcoupled heat pump (GCHP) system in severe cold areas,the mathematical models of a GCHP system and a groundcoupled heat pump with air-soil thermal storage (GCHPASTS) system are developed,and the 20-year performance of the two systems is simulated in a residential building in Harbin,respectively.The results show that the operation of GCHP system makes the soil temperature decline gradually,which leads to the decrease of the coefficient of performance (COP) and the heating effect of the heat pump and year after year.On the contrary,the balance of ground thermal load could be realized during the operation of GCHPASTS system,and the heating performance of heat pump is stable and efficient for long time.The average COP of the heat pump and the system is 4 and 2.57,respectively.The annual guarantee rate of space heating is above 99％.Based on the comparison of the results calculated,it can be proved that a GCHP system couldn’t be used for space heating alone in severe cold area,while a GCHPASTS system is feasibility.