Experimental and numerical investigation on a new type of heat exchanger in ground source heat pump system

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• 作者：Xichen Liu ; Yimin Xiao ; Kiao Inthavong ; Jiyuan Tu
• 关键词：Renewable energy ; Ground source heat pump ; 3I ; type heat exchanger ; Experimental test ; CFD
• 刊名：Energy Efficiency
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：8
• 期：5
• 页码：845-857
• 全文大小：1,091 KB
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• 作者单位：Xichen Liu (1) (2)
  Yimin Xiao (1)
  Kiao Inthavong (2)
  Jiyuan Tu (2)
  
  1. College of Urban Construction and Environmental Engineering, Chongqing University, No. 83, North street, Shapingba District, Chongqing, 400045, China
  2. School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University, PO Box 71, Bundoora, VIC, 3083, Australia
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environment
  Environmental Economics
  Energy Economics
  Renewable Energy Sources
  
• 出版者：Springer Netherlands
• ISSN：1570-6478

文摘

Based on deficiencies of existing underground heat exchangers, a new design is proposed which consists of one outlet and three inlet pipes. Experimental measurements to evaluate the performance of single-U, double-U, and the new design referred to as 3I, for three inlet pipes, were carried out which showed superior performance of the 3I design. Experimental results showed that when under a constant heating load, the average circulating water temperature (ACWT) of the 3I-type was 3.7 and 1 °C lower than that of single-U and double-U, respectively. The thermal resistance of the 3I-type was 15.8 and 31.1 % lower than that of double-U and single-U type. In addition, numerical simulations were performed to further investigate the heat transfer performance over a very long operating time. Numerical results showed that for long-term operation under constant heating load, the ACWT of the 3I-type was 6.6 and 5.8 % lower than that of double-U type. Under a constant inlet water temperature that mimics a condenser output, the heat exchange per unit borehole depth of 3I-type was 17.1 and 11.6 % higher than that of double-U type in different operation conditions. Keywords Renewable energy Ground source heat pump 3I-type heat exchanger Experimental test CFD