Operational analysis of ground-source heat pump air conditioning system for an office building in cold zone

Combined with the project, presents the test results of ground-source heat pump under the shallow geothermal condition. The soil thermal balance analysis results show that the soil temperature increases by 0.3 ℃ after a period of cooling and heating season on condition that heat released from ground-source heat pump units to soil is 1.425 TJ. The analysis of operational data shows that temperature differences of entering and leaving water of condensers or evaporators on operation condition are commonly smaller than those on design condition for ground-source heat pump units, resulting in higher energy consumption of pumps. Suggests to apply the control mode of constant temperature difference and variable frequency of pump.