地埋管回填材料与地源热泵地下温度场的测试分析.pdf

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06 FLU IDMACH INERY Vol 37, No 3, 2009
文章编号: 1005—0329 (2009) 03—0060—04
地埋管回填材料与地源热泵地下温度场的测试分析
郑红旗,祝合虎,陈九法
(东南大学,江苏南京 210096)
摘要: 试验研究了两种不同回填材料地埋管换热器的热响应性能、地源热泵运行对地源温度场的作用。热响应测试
发现回填材料黄沙+膨润土的传热能力优于水泥浆+膨润土,散热能力前者高于后者 11%。对某地源热泵的运行测试
发现,在地下 10m地埋管井壁处土壤最高温度出现在 9月初、最低温度出现在 3月初,随离井距离的增加,井外测点温度
出现最值的时间延后 2~3个月。数据显示,一年后井外测点地下温度场有 1. 9~2. 2K不等的温升,升高程度随离井距
离的增加而增加。本文对优化地源热泵设计、探讨地源热泵的可持续运行具有参考价值。
关键词: 回填材料;地源热泵;土壤温度场
中图分类号: TK529 文献标识码: A
Exper imen tal Investiga tion on Backf illM a ter ial and So il Tempera ture Prof ile
for Ground coupled Hea t Pump System
ZHENG Hong qi, ZHU He hu, CHEN J iu fa
( Southeast University, Nanjing 210096, China)
Abstract: Heat transfer performance of different backfill materials and temperature field variation of ground coup led heat pump
system are studied. Two different backfillmaterials are formed by m ixing cement slurry、yellow sand with bentonite separately. By
thermal response test, heat transfer performance of the former is better than the latter. For the heat sinking capability, the former
is higher 11% than the latter. The highest and the lowest temperature for the borehole edge underground 10m occur at early Sep
tember and March respectively. W ith the increased distance from borehole, the wave crest and wave trough of soil temperature
curve will delay about 2~3 months. So