Experimental Study on the Flow Boiling Heat Transfer and Pressure Drop of Refrigerant R32 in Horizontally Oriented Small-Diameter Tubes

ZHANG Hao; CAO Zehan; MEI Haohan; WANG Qingxian; YAN Gang; CHU Wenxiao; WANG Qiuwang

doi:10.7652/xjtuxb202303005

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Experimental Study on the Flow Boiling Heat Transfer and Pressure Drop of Refrigerant R32 in Horizontally Oriented Small-Diameter Tubes

更新时间：2025-07-09

- Experimental Study on the Flow Boiling Heat Transfer and Pressure Drop of Refrigerant R32 in Horizontally Oriented Small-Diameter Tubes
- Vol. 57, Issue 3, Pages: 58-67(2023)
- 作者机构：
  
  1. 西安交通大学能源与动力工程学院,西安,710049
  2. 广东美的制冷设备有限公司,广东,佛山,528311
  3. 西安交通大学热流科学与工程教育部重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202303005
  CLC： TK124;TN957.2
- Online First：10 March 2023，
  
  Published：2023
- 稿件说明：
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ZHANG Hao, CAO Zehan, MEI Haohan, et al. Experimental Study on the Flow Boiling Heat Transfer and Pressure Drop of Refrigerant R32 in Horizontally Oriented Small-Diameter Tubes[J]. 2023, 57(3): 58-67.
DOI：

ZHANG Hao, CAO Zehan, MEI Haohan, et al. Experimental Study on the Flow Boiling Heat Transfer and Pressure Drop of Refrigerant R32 in Horizontally Oriented Small-Diameter Tubes[J]. 2023, 57(3): 58-67. DOI： 10.7652/xjtuxb202303005.

摘要

针对污染小、能效高、可燃性差、低毒性的新型R32可替代制冷剂在水平管内低温工况下的沸腾换热特性开展研究

设计并自主搭建了管内对流沸腾相变换热实验系统

分别开展了3 mm、4 mm小管径水平管内低温R32沸腾换热的实验研究

探究了质量流速、热流密度、饱和温度等参数对R32对流沸腾换热特性的影响

分析了蒸干对沸腾换热系数恶化的影响机制。结果表明:3 mm内径管的沸腾换热相比4 mm通道平均提升约8%～12%

且高质量流速下的临界干度几乎与管径无关; 相较传热特性

R32饱和温度对两相流动阻力更为敏感

饱和温度自13 ℃降低至11 ℃时阻力损失提高约23%; 利用改进的Fang关联式

可实现小管径水平管内R32对流沸腾换热系数预测

88.56%的实验数据误差可控制在±10%范围内。

Abstract

In this paper

the boiling heat transfer characteristics of the new R32 alternative refrigerant with low pollution

high energy efficiency

poor flammability and low toxicity are investigated under low-temperature conditions in horizontally orientated tubes. The flow boiling system is established and applied to study the R32 flow boiling heat transfer and pressure drop in small-diameter tubes with 3 mm and 4 mm diameters in horizontal orientation. The impact of mass flow rate

heat flux

saturated temperature and vapor quality on the R32 two-phase thermohydraulic performance is experimentally considered. The heat transfer jeopardization by the dry-out mechanism is also observed. The result shows that the heat transfer coefficient of the 3mm tube can be improved by 8%～12% compared to that of the 4mm tube while the critical heat flux is independent of tube diameter at a high flow rate. Meanwhile

compared with heat transfer characteristics

R32 saturation temperature is more sensitive to the two-phase flow resistance

the resistance loss increases by about 23% when the saturation temperature is reduced from 13 ℃ to 11 ℃. Finally

the corrected Fang's correlation is applied to precisely predict the two-phase heat transfer coefficient of R32 in which over 88.56% of data can be controlled within the error of ±10%.

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references

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