An improved thermal response test for U-tube ground heat exchanger based on optical fiber thermometers
An improved thermal response test for U-tube ground heat exchanger based on optical fiber thermometers
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DOI：
10.1016/j.geothermics.2009.06.002
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发表时间：
2009-12-01
期刊：
影响因子：
3.9
通讯作者：
Shibata, Kazuo
中科院分区：
文献类型：
--
作者：
Fujii, Hikari;Okubo, Hiroaki;Shibata, Kazuo
作为一个新的热响应测试（TRT）的一部分，并确定地面的热导率，垂直温度剖面使用可回收的光纤传感器插入到两个地下换热器（GHEs）的U型管安装在前原市（福冈，九州）和钏路市（北海道，日本）。TRT的实测剖面和出口温度与圆柱源函数进行了历史匹配。利用非线性回归方法估算了地表热导率的垂直分布。计算的分布与测量数据一致，表明光纤温度计和TRT解释的可靠性。预计TRT和光纤温度计将被证明对优化安装在非均质地层中的GHE的深度越来越有用。因此将使地热热泵系统的安装成本最小化。(C)2009爱思唯尔有限公司保留所有权利。
As part of a new thermal response test (TRT) and to determine ground thermal conductivities, vertical temperature profiles were obtained using retrievable optical fiber sensors inserted into the U-tubes of two ground heat exchangers (GHEs) installed at Maebaru City (Fukuoka, Kyushu) and Kushiro City (Hokkaido), Japan. Measured profiles and outlet temperatures from TRTs were history-matched with the cylindrical source function. Nonlinear regression was used to estimate the vertical distribution of ground thermal conductivities. The computed distribution is consistent with measured data indicating both the reliability of the optical fiber thermometer and TRT interpretation. It is expected that TRTs and optical fiber thermometers will prove to be increasingly useful for optimizing the depth of the GHEs installed in heterogeneous formations. and consequently will minimize installation costs of geothermal heat pump systems. (C) 2009 Elsevier Ltd. All rights reserved.