Soil thermal imbalance analysis of ground source heat pump system of residential and office buildings in sixteen cities

To recognize the influence of building type and climate region on the soil thermal imbalance and the feasibility of using renewable energy to solve the soil thermal imbalance of ground source heat pump (GSHP), residential and office buildings in sixteen cities in China and five methods of soil heat storage were selected. The characteristics and optimal solutions of soil thermal imbalance in different buildings and cities were analyzed. The results show that most residential buildings have serious soil thermal imbalance rate (TIR), while most office buildings have moderate soil TIR. Soil heat storage is needed for all residential buildings in sixteen cities and office buildings in nine cities. By integrating solar collector (SC), heat source tower (HST) and air-source heat compensator (AHC) with GSHP, the soil cold accumulation of residential buildings in sixteen cities can be solved by SC&HST-GSHP system in Harbin and Changchun, SC&AHC-GSHP system in Hohhot and Urumqi and SC-GSHP system in other twelve cities. While the soil cold accumulation of office buildings in nine cities can be solved by SC-GSHP system in Taiyuan, HST-GSHP system in Harbin, Changchun and Xining, AHC-GSHP system in Hohhot and Urumqi, SC&HST-GSHP system in Shenyang and SC&AHC-GSHP system in Lanzhou and Lhasa.