不同型式地埋管换热器换热性能的试验研究

Heat Response Tests on Double U and Single U-shaped Heat Exchanger in Same Borehole

在同一地埋管热交换孔中,用De32的双U和单U型埋管换热器,及De25双U和单U分别进行了现场热响应对比试验,研究其换热性能的差异;并且在同一场地中用De25与De32的双U,以及De25与De32单U型埋管进行了换热性的对比试验。研究了在地层条件、回填材料、PE管内循环液流速等均相同的情况下,双U与单U型,以及De32与De25埋管换热器的换热性能。结果表明,单U型埋管换热器单位长度换热量比双U型低20%左右,De 32管比De 25低25%左右。

Experiment of comparison of Sitn thermal response were done with double De32 and 25, comparied with the U-shaped tube heat exchanger and single U-shaped tube heat exchanger buried in the same borehole, respectively to compare their heat transfer performance. And at the same site carried out two comparative experiments which compared with the Heat transfer performance. Of one when to single U-shaped tube, compare De 32 with De25. The other when to De25, compare De 32 with De25. And With the same ground conditions, backfill condition as well as the same water flow rate in PE pipe. The unit heat exchange capacity of single U tube borehole heat exchanger is about 16% lower than that of double U-shaped borehole heat exchanger. And De25 tube borehole heat exchanger is about 25% lower than that of De 32 borehole heat exchanger.