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以深度为60 m的镀锌钢管套管式地埋管换热器地源热泵系统和热电阻测温系统为实验平台,对土壤温度、套管式地埋管换热器换热性能及换热器对周围土壤的热影响进行了实验研究。研究表明,南宁市地下5~60 m的土壤温度为23.2~23.7℃;Φ80和Φ65套管式地埋管换热器的合理流量分别为1 500 L/h和1 200 L/h,对应的单位井深换热量分别为107.5W/m和81.4 W/m;不同内管导热系数对套管式地埋管换热器换热性能的影响很小;内进外出流动模式换热器的换热性能优于外进内出模式;间歇运行有利于土壤温度的恢复。
Taking the depth of 60 m galvanized steel tube casing underground heat exchanger ground source heat pump system and thermal resistance temperature measurement system as the experimental platform, the soil temperature, casing heat exchanger performance and exchange The thermal effect of the heater on the surrounding soil was experimentally studied. The results show that the soil temperature of 5 ~ 60 m underground in Nanning is 23.2 ~ 23.7 ℃. The reasonable flow rates of Φ80 and Φ65 casing heat exchangers are 1 500 L / h and 1 200 L / h, respectively The unit heat exchange depth is 107.5W / m and 81.4W / m, respectively. The effect of different inner tube thermal conductivity on the heat transfer performance of the casing tube heat exchanger is very small. The change of in-and-out flow mode heat exchanger Thermal performance is better than entering the inside out mode; intermittent operation is conducive to the recovery of soil temperature.