群井地下换热系统初温和构造因素影响传热的研究

利用传热模拟计算，研究了地源热泵(GSHP)地能利用中群井系统初态因素对温变特性的影响规律。探讨地下初始温度、井群基本构造尺寸等对地下土壤温度场分布的影响。指出土壤初始温度是决定土壤源热泵运行的重要因素，初始温度提高1倍，系统运行时问和输出总热量增加约24倍。小井径对负荷因素影响更加敏感，相同的热负荷下，热流密度高，温度场变化剧烈。对于大井径而言，温度场变化相对平缓，但更易于发生井间传热交互影响。初态因素是强化地能利用中的重要因素之一，据此合理布置大区域群井意义重大。

Effect on ground source field heat transfer of original earth temperature and configuration of multi-boreholes

Based on the computational simulation, the impact of the original earth temperature and the configuration of multi-boreholes on the heat transfer of ground source field was studied in this paper. The results were used to study the characteristics of field temperature change and the interaction of heat transfer among boreholes related to original earth temperature and building sizes of multi-boreholes. Results show that the original earth temperature is very important. Heat exchanged capacity and running hours can be increased by 24 times with only one time of the temperature rise. Small diameter holes are more sensitive to the load, and have a high heat flux for the same load, so result in a much more sharp temperature distribution. On the contrary, for big diameter holes the temperature distribution is smoother, but is prone to resulting in the interaction of heat transfer among boreholes. So the origination and the configuration of the ground source heat transfer system play a key role in promoting the utilization of earth energy in GSHP.