热泵
性能系数
热交换器
环境科学
毛细管作用
传热系数
空气源热泵
热回收通风
核工程
工程类
材料科学
作者
Tong Zhen,Yiming Guan,Tingtao Cao,Yongming Ji,Songtao Hu,Guodan Liu,Nan Liu,Yujing Fan
标识
DOI:10.1016/j.applthermaleng.2021.118008
摘要
• First real application of capillary ground source heat pump in subway tunnel was reported in this paper. • Energy efficiency of the system was evaluated by onsite measurement. • The heat transfer ability of the capillary heat exchanger in summer and winter was tested. • Energy efficiency of the system could be improved under intermittent operation in summer. This study proposed a ground source heat pump system using capillary networks as the front-end heat exchanger, to alleviate thermal pollution and utilize waste heat generated in subway tunnels and the surrounding rock. We conducted onsite measurement of the capillary ground source heat pump system based on a real engineering project involving a subway tunnel. Subsequently, the heat transfer performance of the capillary heat exchanger and energy efficiency of the system were analyzed. The heat transfer capacity of the capillary heat exchanger was approximately 45–80 and 100–110 W/m 2 in a test with a duration of 7 h in winter and a test with a duration of 14 h in summer, respectively. The average coefficient of performance of the heat pump unit and coefficient of performance of the system were 3.72 and 3.18, respectively, in winters, and 3.19 and 2.64, respectively, in summers. Under a 4-day test with an intermittent operation of 8 h per day in summer, the performance of the system was improved and remained stable for four days during the test. The average coefficient of performance of the heat pump unit and of the system for intermittent operation were 3.67 and 2.96, respectively, which were larger than those for 14 h continuous operation in summer. In practical applications, intermittent operation or additional auxiliary cooling sources are recommended in summer conditions.
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