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Cooling performance and condensation evaluation of horizontal earth tube system for the tropical greenhouse

机译：热带温室水平土管系统的制冷性能及冷凝评估

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摘要

This study is the first investigation to apply the horizontal earth tube system (HETS) for cooling in an agricultural greenhouse in the tropical climate of Thailand. The cooling performance and condensation phenomenon of HETS was monitored on the typical days of the winter, summer and monsoon seasons in Chiang Mai (northern Thailand). The experiments were undertaken in 30 m2 of greenhouse volume with the HETS (about 38.5 m of length) buried to a depth of 1 m. The results justified that used soil as a heat basin was possible in a tropical climate and the cooling performance of HETS was moderate. As a result of the variation of solar radiation, the temperature difference of inlet and outlet air flow fluctuated less than other hot weather climates such as subtropical and Mediterranean. Therefore, the obtained cooling performances from the observation in various seasons were distinct. The maximum coefficient of performance (COP) of the typical summer day was higher than the winter and monsoon days in which the values of COP were 3.56,2.04 and 0.77, respectively. By comparing, the COP of the experimental results and one ton of refrigeration of air conditioning, the best results demonstrate that the HETS was capable of cooling up to 74.84% in the summer. For the condensation inside HTES, the operation of the blower was an additional advantage to eliminate the negligible water condensation after cooling finished.
机译：这项研究是首次将水平接地管系统（HETS）应用于泰国热带气候下的农业温室中的冷却研究。在泰国北部清迈的冬季，夏季和季风季节的典型日子里，对HETS的冷却性能和冷凝现象进行了监测。实验在30平方米的温室中进行，将HETS（长度约38.5 m）埋入1 m的深度。结果证明在热带气候下将土壤用作热盆是可能的，并且HETS的冷却性能中等。由于太阳辐射的变化，入口和出口气流的温差波动小于其他炎热气候，如亚热带和地中海。因此，从各个季节的观察获得的冷却性能是不同的。典型夏季的最大性能系数（COP）高于冬季和季风日，后者的COP值分别为3.56、2.04和0.77。通过比较实验结果的COP和一吨空调制冷量，最好的结果表明，HETS在夏季能够降温至74.84％。对于HTES内部的冷凝，鼓风机的运行是消除冷却结束后可忽略的水冷凝的另一个优势。

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  • 来源
    《Energy and Buildings》 |2013年第11期|104-111|共8页
  • 作者

    S. Mongkon; S. Thepa; P. Namprakai; N. Pratinthong;

  • 作者单位

    Division of Energy Technology, School of Energy, Environment and Materials, King Mongkut's University of Technology Thonburi, 126 Pracha-Uthit Road,Bang Mod, Thung Khru, Bangkok 10140, Thailand;

    Division of Energy Technology, School of Energy, Environment and Materials, King Mongkut's University of Technology Thonburi, 126 Pracha-Uthit Road,Bang Mod, Thung Khru, Bangkok 10140, Thailand;

    Division of Energy Technology, School of Energy, Environment and Materials, King Mongkut's University of Technology Thonburi, 126 Pracha-Uthit Road,Bang Mod, Thung Khru, Bangkok 10140, Thailand;

    Division of Energy Technology, School of Energy, Environment and Materials, King Mongkut's University of Technology Thonburi, 126 Pracha-Uthit Road,Bang Mod, Thung Khru, Bangkok 10140, Thailand;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Horizontal earth tube system; Ground heat exchanger; Tropical climate; Agricultural greenhouse;

    机译：水平接地管系统;地面热交换器热带气候;农业温室;

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