流体机械

2010, v.38;No.456(06) 60-63+40

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地埋管热响应测试及数据分析方法
In-situ Thermal Response Test and Data Analysis

乔卫来;陈九法;薛琴;郑红旗;
QIAO Wei-lai,CHEN Jiu-fa,XUE Qin,ZHENG Hong-qi(Southeast University,Nanjing 210096,China)

摘要(Abstract):

对上海某商务楼垂直地埋管换热器进行热响应测试,该商务楼占地面积大,在相隔300m两个地块分别钻三口测试井。本测试的特点是:地埋管换热器有效换热深度大,测试内容包括单U型及双U型地埋管,根据测试要求设定不同的循环流速。采用一维线热源模型对测试数据进行科学严谨的分析,本文将给出计算土壤导热系数、垂直地埋管换热器传热热阻及确定单位井深换热量方法。试验数据具有很强的对比性并能验证测试准确度。测试结果表明,该测试点的土壤导热系数为1.84~1.94 W/(m.K);相同埋管形式与管径地埋管换热器,传热热阻相同。本测试中双U型32埋管热阻大于双U型25热阻,单U型32型埋管热阻最大。应用线热源模整理出计算给定进水温度下的单位井深换热量公式,并计算出不同埋管形式及循环水流量下的单位井深换热量。
Ground source heat pump(GSHP) systems exchange heat with the ground,often through a vertical U-tube borehole heat exchanger(BHE).Thermal response tests(TRT) have been carried out for business buildings in Shanghai.The buildings have a large occupying area,and there are two land blocks both of which drilled three boreholes.The characteristics of the TRT are that the effective depths of BHEs are all 119m,and there are double-U tube and single-U tube BHEs with different circulation flow rate.Line-source model is used for data analysis.The method for calculating soil thermal conductivity,BHE thermal resistance,and the heat dissipating capacity per unit depth of borehole are given in the paper.As shown in these results,the soil thermal conductivity is range from 1.84 to 1.94 W/(m·K).For the same size of BHEs,the thermal resistance is the same,and the thermal resistance of double-U tube25 is large then that of double-U tube32,and the single-U tube32 has the largest thermal resistance.Besides,the heat dissipating capacity per unit depth of boreholes is list in the result.

关键词(KeyWords): 垂直地埋管换热器;热响应测试;导热系数;热阻
vertical heat exchanger;thermal response test;thermal conductivity;thermal resistance

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作者(Author): 乔卫来;陈九法;薛琴;郑红旗;
QIAO Wei-lai,CHEN Jiu-fa,XUE Qin,ZHENG Hong-qi(Southeast University,Nanjing 210096,China)

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