地源热泵设计参数原位热响应测试的方法及实验

以电加热器作为热源的热响应测试仪,仅能进行夏季制冷工况测试,参数设定以经验为主。应用了以热泵作为冷/热源、可测试冬季供暖工况的原位热响应测试仪进行测试实验,结果表明:热泵输出功率稳定,测试功率在夏季制冷工况和冬季供暖工况宜分别设为40～60 W/m和35～45 W/m;热响应测试时间不宜少于48 h,若模型精度要求高于2.5%,需根据地层情况适当延长测试时间;野外测试的冬季供暖工况下热交换孔的热阻为0.08(m.℃)/W,100 m深度内岩土体的综合导热系数为1.67 W/(m.℃)。测试结果可满足地源热泵系统设计要求。

In-Situ Thermal Response Test Methods and Experiment for Design of Ground Source Heat Pump System

The thermal response test equipment with electric heat source merely test the refrigeration condition,and the test parameters was set by experience.Heat pump source thermal response test equipment can test both of the refrigeration condition and the thermal condition,the test result of this equipment showed that the output power of heat pump was stable under the T tube valve control.And the test power should be defined as 40-60 W/m in refrigeration condition and 35-45 W/m in heating condition.Test time should not be less than 48 hours and should be extended when the was less than 2.5%.Filed validation showed that thermal resistance of heat exchanging role was 0.08(m·℃)/W,and the comprehensive thermal conductivity of 100 m depth stratum was 1.67 W/(m·℃) in heating condition,which can meet the needs of ground source heat pump system.