制冷系统用新型水平管降膜蒸发

doi:10.3969/j.issn.0438-1157.2013.11.003

化工学报 ›› 2013, Vol. 64 ›› Issue (11): 3894-3902.DOI: 10.3969/j.issn.0438-1157.2013.11.003

制冷系统用新型水平管降膜蒸发

郭磊¹, 李敏霞¹, 马一太¹, 陈焕倬²

1. 天津大学机械工程学院, 中低温热能高效利用教育部重点实验室, 天津 300072;
2. 中国科学院工程热物理研究所, 北京 100190

收稿日期:2013-04-09 修回日期:2013-07-17 出版日期:2013-11-05 发布日期:2013-11-05
通讯作者: 李敏霞
作者简介:郭磊(1988-),男,硕士研究生。
基金资助:
国家自然科学基金项目(51176133,51076111)。

Falling film evaporation on new horizontal tube in refrigeration system

GUO Lei¹, LI Minxia¹, MA Yitai¹, CHEN Huanzhuo²

1. Key Laboratory of Efficient Utilization of Low and Medium Grade Energy, Ministry of Education, School of Mechanical Engineering, Tianjin University, Tianjin 300072, China;
2. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China

Received:2013-04-09 Revised:2013-07-17 Online:2013-11-05 Published:2013-11-05
Supported by:
supported by the National Natural Science Foundation of China(51176133,51076111).

摘要/Abstract

摘要： 以R134a制冷循环为基础,将水平管降膜蒸发应用于蒸发器中,通过调节不同工况来研究其换热特性。其中热通量8～40 kW·m^-2,工质的喷淋量0.005～0.04 kg·m^-1·s^-1,以光滑管为基础,对针对降膜蒸发而设计的TJX、EX两种强化管进行了实验研究,并利用修正威尔逊法进行数据处理。分析表明,降膜蒸发换热特性主要与热通量和喷淋量有关,而随着热通量的增加,每根管型传热系数在遇到临界热通量点后呈现下降趋势。此外强化表面的传热系数要明显优于光滑管,特别是具有网格槽道设计的EX管。由于实验系统是一个制冷系统,含有润滑油,发现润滑油的存在明显降低了传热系数。最后在实验基础上对光滑管换热特性进行预测,并在此基础上提出强化管的修正系数。

关键词: 降膜蒸发, 强化表面, 传热, 预测

Abstract: Based on a refrigeration cycle using R134a as a working fluid,the falling film evaporation on horizontal tubes was used in the evaporator.The heat transfer characteristics of the falling film evaporation were investigated experimentally under different conditions.The heat fluxes varied from 8 to 40 kW·m^-2 and the mass flow rate of the sprayed liquid ranged from 0.005 to 0.04 kg·m^-1·s^-1.The performance of a smooth tube and two enhanced tubes(a TJX tube and an EX tube)were tested in the experiment.The two enhanced tubes were designed for the falling film evaporation specifically.The experimental data were processed by using the modified Wilson method.The test results show that the heat transfer characteristics of the falling film evaporation are mainly associated with heat flux and mass flow rate.For all tubes,the heat transfer coefficient increases before the occurrence of the critical heat flux.The performance of enhanced tubes are better than that of smooth tube,especially the EX tube with grill channels on the surface.With the oil in the refrigeration system,the presence of oil in the experimental loop deteriorates the heat transfer coefficient significantly.Finally,a new heat transfer correlation is used to predict the heat transfer coefficient of the smooth tube,and correction factors for the heat transfer prediction of enhanced tubes are proposed.

Key words: falling film evaporation, enhanced surface, heat transfer, prediction

中图分类号:

TK124

郭磊, 李敏霞, 马一太, 陈焕倬. 制冷系统用新型水平管降膜蒸发[J]. 化工学报, 2013, 64(11): 3894-3902.

GUO Lei, LI Minxia, MA Yitai, CHEN Huanzhuo. Falling film evaporation on new horizontal tube in refrigeration system[J]. CIESC Journal, 2013, 64(11): 3894-3902.

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制冷系统用新型水平管降膜蒸发

Falling film evaporation on new horizontal tube in refrigeration system

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