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化工学报  2014 

HFC134a水平二维与三维肋管外冷凝换热特性试验

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Keywords: 凝结,传热,,模型,强化管,HFC134a,水平管

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Abstract:

环保工质与高效冷凝管的应用对制冷行业实现节能减排意义重大,工质在强化管外膜状凝结换热特性是二者推广应用的关键。本文建立了水平管外膜状凝结换热试验系统,试验研究了HFC134a在4种二维肋管与2种三维肋管外的膜状凝结传热特性。试验管公称外径为19.05mm、有效换热长度为1000mm;试验中,通过改进的Wilson图解法获取试验管水侧对流传热系数。结果表明:HFC134a水平二维与三维肋管外冷凝传热系数分别达到同热通量下光管的11倍与19倍以上;HFC134a工质对应最佳二维肋管的肋密度在(1069~1575)fpm(肋每米)之间、肋高在(0.7~1.5)mm之间,对应最优三维肋管(与本文试验肋型相似)肋密度低于2000fpm;既有二维肋管膜状凝结换热模型需要进一步完善,肋管结构优化过程中应遵循优先提升肋密度的原则。

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