[1] Yang Wei, Zhou Jin, Zhang Guoqiang,. Performance analysisof U-vertical direct-expansion ground-source heat pump [J]. Journal of Southeast University (English Edition), 2010, 26 (2): 209-211. [doi:10.3969/j.issn.1003-7985.2010.02.014]
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Performance analysisof U-vertical direct-expansion ground-source heat pump(
)
U形垂直埋管直接膨胀式地源热泵的性能分析
)Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]
- Volumn:
- 26
- Issue:
- 2010 2
- Page:
- 209-211
- Research Field:
- Energy and Power Engineering
- Publishing date:
- 2010-06-30
Info
- Title:
- Performance analysisof U-vertical direct-expansion ground-source heat pump
- U形垂直埋管直接膨胀式地源热泵的性能分析
- Author(s):
- Yang Wei; Zhou Jin; Zhang Guoqiang
- College of Civil Engineering, Hunan University, Changsha 410082, China
- PACS:
- TU831.3
- DOI:
- 10.3969/j.issn.1003-7985.2010.02.014
- Abstract:
- The performance of a direct-expansion ground-source heat pump(DX GSHP)system is theoretically analyzed.Compared with the conventional ground-source heat pump(GSHP), the DX GSHP has a lower condensing temperature in the cooling mode and a higher evaporating temperature in the heating mode, and the ground heat exchanger(GHE)in the DX GSHP has a low thermal resistance.Therefore, the coefficient of performance(COP)of the DX GSHP is higher than that of the GSHP.In addition, the system performance of the DX GSHP system is higher than that of the conventional GSHP system because there are no secondary solution loops and water circulating pumps in the DX GSHP system.The experimental energy performance of the DX GSHP system is also investigated based on the actual operational data.The tested DX GSHP system is installed in Xiangtan, China.The U-vertical GHE of the DX GSHP is buried in a water well.The length and the outside nominal diameter of the GHE are 42 m and 12.7 mm, respectively.The experimental results show that the maximum(COP)and the average COP of the DX GSHP system in the heating mode are 5.95 and 4.72, respectively.
- 首先, 对直接膨胀式地源热泵的性能进行了理论分析.与常规地源热泵相比, 直接膨胀式地源热泵的地埋管换热器热阻更小, 在制冷工况下具有更低的冷凝温度, 在制热工况下具有更高的蒸发温度, 因此它具有更高的性能系数.直接膨胀式地源热泵系统无需二次换热回路和循环水泵, 因此具有更高的系统性能系数.然后, 根据实测数据对直接膨胀式地源热泵实验系统的性能进行了分析.该实验系统建立在中国湘潭, 其U形垂直地埋管换热器置于水井之中, 地埋管换热器的长度为42 m, 外径为12.7 mm.测试结果表明, 在制热工况下此直接膨胀式地源热泵系统的性能系数最大值为5.95, 平均值为4.72.
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Memo
- Memo:
-
Biographies: Yang Wei(1981—), male, graduate;Zhou Jin(corresponding author), male, doctor, associate professor, zhoujin-y@263.net.
Foundation item: The National Key Technologies R& D Program of China during the 11th Five-Year Plan Period(No.2006BAJ04B04, 2006BAJ04A05, 2006BAJ04A13).
Citation: Yang Wei, Zhou Jin, Zhang Guoqiang.Performance analysis of U-vertical direct-expansion ground-source heat pump[J].Journal of Southeast University(English Edition), 2010, 26(2):209-211.