土壤源热泵岩土温度限值计算方法研究

The Research of Theoretical Calculation Methods of the Ground Limit Temperature of GSHP

夏热冬冷地区土壤源热泵在全寿命周期运行过程中,冬夏季土壤吸放热不相等,可能导致大地蓄能失调进而引起系统运行效率下降。而目前关于土壤源热泵系统大地蓄能失调的判定仅停留在冬、夏季负荷比例上的估算,还没有形成一个评价大地蓄能失调的理论计算方法。针对夏热冬冷地区土壤源热泵全寿命周期运行过程中的大地蓄能失调评价方法,提出了以运行费用现值比较为评价参数的土壤源热泵系统的岩土温度限值的理论以及蓄能失调判断依据。

The ground source heat pumps operated in hot summer and cold winter area absorb heat from soil in winter and pump heat into source in summer, the heat the GSHP absorb is not equal to the heat the system release, which will lead to storage disorders of soil and decrease the efficiency of the GSHP. Recently, the ground energy storage imbalance of the ground source heat pump systems is just judged by the estimate of the cooling load in summer and the heating load in winter rather than any theoretical calculation methods. This paper aimed to propose a principle and theoretical method to judge the ground energy storage imbalance of the ground source heat pump systems and calculate the limit temperature of the ground which based on the comparison of the present value of operating costs.