Falling film evaporation on new horizontal tube in refrigeration system

GUO Lei; LI Minxia; MA Yitai; CHEN Huanzhuo

doi:10.3969/j.issn.0438-1157.2013.11.003

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Falling film evaporation on new horizontal tube in refrigeration system

更新时间：2025-12-10

- Falling film evaporation on new horizontal tube in refrigeration system
- CIESC Journal Issue 11, Pages: 3894-3902(2013)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2013.11.003
  CLC： K124
- Online First：05 November 2013，
  
  Published：05 November 2013
- 稿件说明：
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GUO Lei, LI Minxia, MA Yitai, et al. Falling film evaporation on new horizontal tube in refrigeration system[J]. CIESC Journal, 2013, (11): 3894-3902.
DOI：

GUO Lei, LI Minxia, MA Yitai, et al. Falling film evaporation on new horizontal tube in refrigeration system[J]. CIESC Journal, 2013, (11): 3894-3902. DOI： 10.3969/j.issn.0438-1157.2013.11.003.

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。

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.

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