CO<sub>2</sub>微通道气体冷却器压降与传热特性研究

李程 1; 巫江虹 1; 崔晓龙 2; 文光彩 2; 何冰强 1; 3; 陈基镛 4

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CO₂微通道气体冷却器压降与传热特性研究

更新时间：2025-07-09

- CO₂微通道气体冷却器压降与传热特性研究
- CO₂ Pressure Drop and Heat Transfer Characteristics in Micro-Channel Gas Cooler
- 西安交通大学学报 2010年44卷第9期页码：48-53
- 作者机构：
  
  华南理工大学机械与汽车工程学院,广州,510641
- 作者简介：
- 基金信息：
  
  : 2010-04-28. 作者简介: 李程(1985-),男,硕士生;巫江虹(联系人),女,副教授. 基金项目: 广东省教育厅产学研项目(2009B090300380);广州市科技计划项目(2007Z2-D0231)
- DOI：
  中图分类号： TB657.5
- 网络首发：2010-09-10，
  
  纸质出版：2010
- 稿件说明：
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李程 1, 巫江虹 1, 崔晓龙 2, 等. CO₂微通道气体冷却器压降与传热特性研究[J]. 西安交通大学学报, 2010,44(9):48-53.

CO₂ Pressure Drop and Heat Transfer Characteristics in Micro-Channel Gas Cooler[J]. 2010, 44(9): 48-53.
李程 1, 巫江虹 1, 崔晓龙 2, 等. CO₂微通道气体冷却器压降与传热特性研究[J]. 西安交通大学学报, 2010,44(9):48-53. DOI：

CO₂ Pressure Drop and Heat Transfer Characteristics in Micro-Channel Gas Cooler[J]. 2010, 44(9): 48-53. DOI：

摘要

在微通道平行流式气冷器内进行了CO

的压降和换热特性实验研究

探讨了跨临界CO

循环换热过程中制冷剂质量流量、系统压力对气冷器换热性能、进出口压降的影响.实验结果表明:在接近临界温度时

物理性能受压力和温度的影响较大

换热系数是远离临界区的7～9倍; 随着CO

质量流量的提高

微通道管内流体Re相应提高

而较高的Re又使得湍流扩散率、管内温度梯度增大

同时在制冷剂入口附近的微通道换热器高温区域面积增大

表明当系统压力相同时

制冷剂入口温度随CO

质量流量的增加而增大.在一定的质量流量或压力下

存在着一个最佳的压力或质量流量

使得气冷器进出口压降达到最小.随着Re增加

气冷器的CO

压降关联式的预测精度均有所提高

为此提出了新的换热关联式和压降关联式.

Abstract

The pressure drop and heat transfer characteristics of a micro-channel gas cooler were studied with the trans-critical CO

cycle. The influence of the CO

mass flowrate and the pressure difference of the inlet and the outlet on the heat transfer performance of the gas cooler was experimentally investigated. The results show that the thermal physical properties of carbon dioxide were affected significantly by the fluid pressure and temperature near the critical temperature

and the heat transfer coefficient was 7-9 times that at the other area far from the critical area. The Reynolds number in the micro-channels increased with the increase in CO

mass flowrate

leading to the increase in the turbulent diffusion rate and the increase i

n the temperature gradient inside the tube. The region edge with relative higher refrigerant temperature near the entrance extended

indicating that the inlet refrigerant temperature increased with the CO

mass flowrate at the same system inlet pressure. At a certain mass flowrate or inlet pressure

there was an optimum pressure value or CO

mass flowrate value to generate a minimum pressure drop in the system. The results obtained by correlation formulas were compared

and then a new heat transfer correlation and a new pressure drop correlation were proposed.

关键词

Keywords

references

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DOI：

摘要

Abstract

关键词

Keywords

references

CO₂微通道气体冷却器压降与传热特性研究

CO₂ Pressure Drop and Heat Transfer Characteristics in Micro-Channel Gas Cooler