Design and simulation research of Ground Source Heat Pump system in severe cold regions

In the cold areas of northern China, cold and heat soil-conditioning throughout the year is the key issue in the course of actual operating of the Ground Source Heat Pump (GSHP) system. This paper chose a public building of Changchun as the research object and adopted a new thermal compensation partition control method to balanced GSHP cold and heat load. According to the climate condition of severe cold regions, TRNSYS software is used to establish the GSHP system simulation model, and simulate the change of soil temperature annual running. The results showed that: when the system moves for 1 year, the inlet and outlet temperature of the underground pipe is greater than the average soil temperature, the temperature difference is large between heat productions and there is adequate capacity for cooling; for the heating season, the average soil temperature is higher than the inlet and outlet temperature of the underground pipe, and can ensure that a certain degree of temperature difference shows a matched heating and cooling regional area, and the GSHP system can be efficient and smooth running. The simulation system runs for 20 years, in 10 years the soil temperature drop is relatively apparent and when after 10 year the soil temperature drop is basically stable, the system can be highly efficient in operation. The description of the compensation method is feasible in the northern cold regions.