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研究了广东地区地源热泵机组间歇式运行模式下埋地管换热器的换热能力及土壤热响应特性。土壤源热泵系统的单U、双U埋地管换热器深30m,在连续运行工况下,系统运行12h后土壤温度变化很小,单U和双U井的土壤平均温度分别下降5.16℃和6.30℃,系统停机后自然恢复到初始温度需要长达75h。分别取开停时间比3h:5h和4h:5h进行实验,并比较了间歇和连续两种工况下地埋管换热能力的大小,发现间歇工况下单U井的换热能力可分别提高8.3%和7.6%,双U井可分别提高10.2%和3.1%。
The heat transfer capacity and soil thermal response of buried tube heat exchangers under intermittent operation mode of ground source heat pump units in Guangdong were studied. The soil temperature of single-U and double-U buried tube heat exchangers in ground-source heat pump system is 30m deep. Under continuous operating conditions, the soil temperature changes little after 12h of system operation, and the average soil temperature of single U and double U wells decreases by 5.16 ℃ And 6.30 ℃, it will take up to 75h for the system to naturally recover to the initial temperature after shutdown. The experiments were carried out with 3h: 5h and 4h: 5h respectively. The heat transfer capacity of buried pipe under intermittent and continuous conditions was compared. It was found that the heat exchange capacity of single U-well could be improved under intermittent conditions 8.3% and 7.6% respectively, and double U wells increased by 10.2% and 3.1% respectively.