Numerical Simulation on Frosting Process in Hot Channel of Plate-Fin Heat Exchangers

doi:10.7652/xjtuxb201905006

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Numerical Simulation on Frosting Process in Hot Channel of Plate-Fin Heat Exchangers

更新时间：2025-07-09

- Numerical Simulation on Frosting Process in Hot Channel of Plate-Fin Heat Exchangers
- Vol. 53, Issue 5, Pages: 37-42(2019)
- 作者机构：
  
  西安交通大学动力工程多相流国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201905006
  CLC： TK124
- Online First：10 May 2019，
  
  Published：2019
- 稿件说明：
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Numerical Simulation on Frosting Process in Hot Channel of Plate-Fin Heat Exchangers[J]. 2019, 53(5): 37-42.
DOI：

Numerical Simulation on Frosting Process in Hot Channel of Plate-Fin Heat Exchangers[J]. 2019, 53(5): 37-42. DOI： 10.7652/xjtuxb201905006.

摘要

为了研究板翅式换热器热通道在不同工况下的霜层生长规律以及霜层对板翅式换热器的影响

建立了基于Lewis传热传质类比理论的结霜模型

并将该模型与板翅式换热器非稳态传热模型相结合。首先借助平板结霜可视化观测实验台验证了该模型的准确性

然后主要计算对比了湿空气进口流速分别为0.8、1.2、2 m/s

相对湿度分别为60%、70%、80%时换热器热通道结霜量的大小

以及结霜起点位置的变化。结果表明:空气流速越大

霜层增长的速率越大

结霜区域越小; 空气相对湿度越大

霜层增长的速率越大

结霜区域越大。并且

随着霜层厚度增长通道压降持续增大

板翅式换热效率持续下降

当热通道内霜层平均厚度累积到1.5 mm时换热器效率下降约10%。

Abstract

To study the frost growth rule in the hot channel of plate-fin heat exchangers under different working conditions

a frosting model based on Lewis heat and mass transfer analogy theory is established and then combined with the unsteady heat transfer model of plate-fin heat exchanger. First

the accuracy of the model is verified on the test rig for frosting visualization on flat surface. Then

the mass and starting positions of frost at inlet humid air flowing speeds of 0.8 m/s

1.2 m/s and 2.0 m/s and relative humidities of 60%

70% and 80% are compared

respectively. The results show that the higher the air velocity

the faster the frost growth rate and the smaller the frost area. Also

the higher the relative humidity of air

the faster the frost growth rate and the larger the frost area. Meanwhile

with the increase of the frost layer thickness

the pressure drop of the channel continues to increase

and the efficiency of the plate-fin heat exchanger decreases. When the average thickness of the frost layer accumulates to 1.5 mm in the hot channel

the efficiency of the heat exchanger decreases by about 10%.

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Keywords

references

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