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热力能源隧道毛细管网换热器性能实验研究
王永艳1, 周国兵1, 刘军2, 王富强3, 乔国刚4, 黄辉2
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(1.华北电力大学;2.北京建筑大学土木与交通工程学院;3.北京市政建设集团有限责任公司第三工程处;4.北京市政建设集团有限责任公司)
摘要:
毛细管网换热器由于换热面积大、温度均匀等诸多优点在交通类能源隧道已有较多应用。热力能源隧道作为一种新型能源隧道因具有内热源而与交通类能源隧道差异较大,为研究毛细管网换热器在热力能源隧道应用的可行性,本文实验研究了热力能源隧道毛细管网换热器采用1:1间歇运行模式下的换热性能。结果表明:隧道内初始空气温度越高,毛细管网换热器的换热量越大,隧道内初始空气温度增加10 ℃,换热量增加45.9 %;换热量随循环水流速增大而增加,呈指数型变化,流速增大到0.1 m/s时,换热量趋于稳定;循环水入口温度越低,换热量越大;在换热过程中,毛细管网换热器吸收的热量达到143.09~187.22 W/m2,远高于交通类能源隧道的单位面积换热量。研究成果可为内热源能源隧道毛细管网换热器的设计与应用提供依据。
关键词:  热力能源隧道  隧道内空气温度  毛细管网换热器  换热性能  实验
DOI:
投稿时间:2024-01-11  修订日期:2024-01-30   录用日期:2024-04-03
基金项目:北京市自然科学基金资助项目
Experimental investigation on performances of capillary mat heat exchangers in a thermal energy tunnel
Abstract:
Capillary mat heat exchangers are increasingly used in transportation energy tunnels due to their large heat transfer area, uniform temperature, etc. Thermal energy tunnel, as a new type of energy tunnel, is different from transportation energy tunnels due to its internal heat source. To examine the feasibility of applying capillary mat heat exchangers in thermal energy tunnels, heat transfer performances of them are experimentally investigated in a thermal energy tunnel using 1:1 intermittent operating mode. The results show that the higher the initial air temperature (T0) in the tunnel is, the greater is the heat transfer rate per mat area (q). As the T0 increases by 10°C, the q increases by 45.9%. The q increases with the increase of circulating water velocity (u), presenting an exponential change. When u increases up to 0.1m/s, the q tends to be stable. The lower the inlet temperature of circulating water (tin) is, the greater is the q. During the heat transfer process, the q reaches 143.09W/m2~187.22W/m2, which is much higher than that of transportation energy tunnels. The results can provide a basis for the design and application of capillary mat heat exchangers in energy tunnels with internal heat sources.
Key words:  thermal energy tunnel  tunnel air temperature  capillary mat heat exchanger  heat transfer performance  experiment

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