Comparative study of two loop heat pipes using R134a as the working fluid
Comparative study of two loop heat pipes using R134a as the working fluid
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以R134a为工质的两种环路热管对比研究
DOI：
10.1016/j.applthermaleng.2019.114459
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发表时间：
2020-01
影响因子：
6.4
通讯作者：
Wen Dongsheng
中科院分区：
文献类型：
--
作者：
Wang Huanfa;Lin Guiping;Bai Lizhan;Tao Yongbo;Wen Dongsheng
为了促进环路热管的商业应用，特别是在民用领域，环境友好的R134 a被认为是替代常用的无水氨的良好候选工质。本文设计并制作了两套以R134 a为工质的低压液相色谱仪，一套采用镍芯，另一套采用不锈钢芯。对它们的热性能进行了实验研究、评价和比较，主要包括启动、功率增量测试、热阻和传热能力。基于实验结果，发现两种R134 a热泵均具有良好的启动性能，最大传热量均大于100 W，并对热负荷的阶跃变化具有良好的响应特性。镍芯R134 a LHP显示出良好的抗重力能力;然而，不锈钢芯的LHP对不利的海拔高度非常敏感。对上述实验结果的物理机制进行了分析和讨论。本文的工作有助于更好地了解R134 a型低压热泵的运行性能和特点，为今后的应用提供了良好的设计指导和参考。
In order to promote future commercial applications of loop heat pipe (LHP) especially in the civil fields, environmentally friendly R134a is considered a good candidate working fluid to replace the commonly used anhydrous ammonia. In this work, two sets of LHPs with R134a as the working fluid were designed and fabricated, one with a nickel wick, and the other with a stainless steel wick. Their thermal performance, mainly including the startup, the power increment test, the thermal resistance and the heat transport capability, were experimentally studied, evaluated and compared. Based on the experimental results, it is found that both of the R134a LHPs present excellent startup performance, achieve a maximum heat transfer capacity greater than 100 W, and exhibit good response characteristics to stepwise change of heat load. The R134a LHP with a nickel wick shows good anti-gravity capability; however, the one with a stainless steel wick is quite sensitive to the adverse elevation. The physical mechanisms responsible for the experimental results mentioned above have been analyzed and discussed. This work contributes to a better understanding on the operating performance and characteristics of the R134a LHPs, providing good design guidance and reference for its future applications.
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期刊：
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