地源热泵地下热响应实验的季节效应分析

Seasonal effect on in-situ thermal responsetests for ground-source heat pump

以双U形地埋管换热器为例,进行了3个不同季节的地下热响应换热实验。实验结果表明,在地埋管换热器地下热响应实验中存在着季节效应。在相同加热功率的情况下,冬季单井换热量略高于夏季,此差异主要与土壤初始温度、土壤导热系数的季节性变化有关系。不同季节下,钻孔过程对于土壤初始温度的扰动作用也不一样。在大规模地源热泵系统的优化设计过程中,建议充分考虑上述季节效应的影响。

Taking the double-U type ground heat exchanger （GHE） as example, performs in-situ thermal response tests in three different seasons, and the results show that there does exist the seasonal effect. For the same heating power, the thermal performance of GHE in winter is better than that in summer, where the difference is mainly caused by the seasonal variation of the initial temperature and thermal conductivity of the ground. Besides, the disturbance of the boring process on the initial ground temperature is different with the seasonal variation. Suggests that the above seasonal effect should be taken into full consideration during the design of large-scale ground-source heat pump systems.