浅层地热能热响应测试仪检测台检测机理及试验研究

Mechanism and experiment research of performance test bed for thermal response tester

岩土导热系数是地埋管换热器设计的重要依据,获取导热系数的有效措施是现场热响应测试法。为检测国内大多数热响应测试仪器的性能,基于线热源理论设计了一套浅层地热能热响应测试仪性能检测平台。介绍了检测台的结构和功能,建立了检测台的控制系统。利用所开发的检测台对1台热响应测试仪进行测试,分别模拟不同参数的"标准孔"。该检测台的出水温度可按控制要求稳定输出,可以模拟可控的"标准孔",被检测的热响应测试仪流量和温度误差均符合要求,精度较高。通过热响应试验得到的导热系数误差的平均值为3.63%。

The rock-soil thermal conductivity coefficient is an important design parameter for borehole heat exchanger of ground source heat pump system,it is able to be acquired by thermal response test.According to the line heat source theory, a performance test bed used for testing thermal response measuring instrument is designed and built. The components and their functions of the test bed are introduced; its control system is established. A thermal response test instrument is calibrated on the proposed test bed that is able to simulate ＂standard holes＂ with different parameters. The test bed can steadily output water according to the requirement to simulate controllable ＂standard hole＂; error of measured flow and temperature of calibrated thermal response test instrument meet the requirements.The precision of the tested instrument is relatively high. The average error of the thermal conductivity coefficient is 3.63%.