自然工质R290与R22滴状凝结换热特性的对比分析

doi:10.3969/j.issn.0438-1157.2013.08.018

化工学报 ›› 2013, Vol. 64 ›› Issue (8): 2827-2832.DOI: 10.3969/j.issn.0438-1157.2013.08.018

自然工质R290与R22滴状凝结换热特性的对比分析

宁静红¹, 刘圣春¹, 叶庆银²

1. 天津商业大学天津市制冷技术重点实验室, 天津 300134;
2. 天津商业大学制冷系, 天津 300134

收稿日期:2012-12-10 修回日期:2013-01-23 出版日期:2013-08-05 发布日期:2013-08-05
通讯作者: 宁静红(1964- ),女,博士,副教授。
作者简介:宁静红(1964- ),女,博士,副教授。
基金资助:
国家自然科学基金项目(51006073)。

Analysis on heat transfer characteristic of dropwise condensation of natural refrigerant R290 and R22

NING Jinghong¹, LIU Shengchun¹, YE Qingyin²

1. Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce, Tianjin 300134, China;
2. Refrigeration Department, Tianjin University of Commerce, Tianjin 300134, China

Received:2012-12-10 Revised:2013-01-23 Online:2013-08-05 Published:2013-08-05
Supported by:
supported by the National Natural Science Foundation of China(51006073).

摘要/Abstract

摘要： 通过对自然工质R290与传统工质R22滴状凝结换热特性的对比分析得出,表面过冷度要远大于蒸气饱和温度对直接凝结长大小液滴的最小半径和临界半径的影响,过冷度越大,小液滴半径和临界半径越小,R290的小液滴半径和临界半径与R22的相比相差不大。通过R290与R22制冷工质单个液滴的传热量随着接触角的增加呈现出先增加后减小的变化趋势,存在最大值。通过单个液滴的传热量随着表面过冷度的增加而增大,随着饱和温度的升高而减小,通过R290单个液滴的传热量要明显大于通过R22单个液滴的传热量。通过R290与R22滴状凝结换热表面的热通量随接触角的变化具有最大值,存在最佳的接触角。R290滴状凝结换热的热通量要明显大于R22滴状凝结换热的热通量。

关键词: 自然工质R290, 滴状凝结, 传热量, 热通量, 换热特性

Abstract: By comparing the heat transfer characteristics of dropwise condensation of natural refrigerant R290 and conventional refrigerant R22,following conclusions are obtained.The effect of surface subcooling degree on the smallest radius and the critical radius of droplet is much larger than that of the saturation temperature,and larger surface subcooling degree makes the smallest radius and the critical radius of droplet smaller.The smallest radius and the critical radius of R290 show little difference from those of R22.The heat transfer capacity through the single droplet of R290 or R22 increases first and then decreases with the increase of contact angle,suggesting the existence of the maximum heat transfer capacity.The heat transfer capacity through the single droplet increases with the increase of surface subcooling degree and decreases with the increase of the saturation temperature.The heat transfer capacity through the single droplet of R290 is obviously larger than that of R22.The dropwise condensation heat flux of R290 or R22 through the heat transfer surface has maximum value at the optimum contact angle.The dropwise condensation heat flux of R290 is obviously higher than that of R22.

Key words: natural refrigerant R290, dropwise condensation, heat transfer capacity, heat flux, heat transfer characteristic

中图分类号:

TB61⁺1

宁静红, 刘圣春, 叶庆银. 自然工质R290与R22滴状凝结换热特性的对比分析[J]. 化工学报, 2013, 64(8): 2827-2832.

NING Jinghong, LIU Shengchun, YE Qingyin. Analysis on heat transfer characteristic of dropwise condensation of natural refrigerant R290 and R22[J]. CIESC Journal, 2013, 64(8): 2827-2832.

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自然工质R290与R22滴状凝结换热特性的对比分析

Analysis on heat transfer characteristic of dropwise condensation of natural refrigerant R290 and R22

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