| Thermal Response Test by Improved Test Rig with Heating or Cooling Soil简 |
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| 引用本文： | 付文成,朱家玲,张伟.Thermal Response Test by Improved Test Rig with Heating or Cooling Soil简[J].天津大学学报(英文版),2014,20(1):15-20. |
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| 作者姓名： | 付文成 朱家玲 张伟 |
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| 基金项目： | Supported by the National Natural Science Foundation of China （No.41272263）. |
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| 摘 要： | An improved test rig providing both the heat and cold source was used to perform thermal response test(TRT), and the line source model was used for data analysis. The principle of determining the temperature difference between the inlet and outlet of test well can keep the heating or cooling rate constant, along with a reduced size of test rig. Among the influencial factors of the line source model, the temperature difference was determined as the most important, which agreed with the test results. When the gravel was taken as the backfill material, the soil thermal conductivities of heating and cooling at the test place were 1.883 W/(m·K) and 1.754 W/(m·K), respectively, and the deviation of TRT between heating and cooling soil was 6.8%. In the case of fine sand, the thermal conductivities of heating and cooling were 1.541 W/(m·K) and 1.486 W/(m·K), respectively, and the corresponding deviation was 6%. It was also concluded that different velocities of water had less influence on TRT than the temperature difference.
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| 关 键 词： | 测试装置 土壤改良 试验台 热响应 冷却 加热 速率常数 影响因素 |
Thermal response test by improved test rig with heating or cooling soil |
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| Wencheng Fu,Jialing Zhu,Wei Zhang.Thermal response test by improved test rig with heating or cooling soil[J].Transactions of Tianjin University,2014,20(1):15-20. |
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| Authors: | Wencheng Fu Jialing Zhu Wei Zhang |
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| Institution: | 1. Key Laboratory of Efficient Utilization of Low and Medium Grade Energy of Ministry of Education, Tianjin University, Tianjin, 300072, China
2. Tianjin Geothermal Research and Training Center, Tianjin University, Tianjin, 300072, China
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| Abstract: | An improved test rig providing both the heat and cold source was used to perform thermal response test (TRT), and the line source model was used for data analysis. The principle of determining the temperature difference between the inlet and outlet of test well can keep the heating or cooling rate constant, along with a reduced size of test rig. Among the influencial factors of the line source model, the temperature difference was determined as the most important, which agreed with the test results. When the gravel was taken as the backfill material, the soil thermal conductivities of heating and cooling at the test place were 1.883 W/(m·K) and 1.754 W/(m·K), respectively, and the deviation of TRT between heating and cooling soil was 6.8%. In the case of fine sand, the thermal conductivities of heating and cooling were 1.541 W/(m·K) and 1.486 W/(m·K), respectively, and the corresponding deviation was 6%. It was also concluded that different velocities of water had less influence on TRT than the temperature difference. |
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| Keywords: | ground source heat pump thermal response test thermal conductivity backfill material |
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