双排对折型微通道换热器仿真模型开发

doi:10.11949/0438-1157.20201534

摘要/Abstract

摘要：

针对双排对折型微通道换热器，建立三维分布参数模型，基于双排对折的独特结构分别划分换热区和集流管的控制单元，并创新性提出一种基于流程的制冷剂流路描述方法。调研并整理了公开发表文献中记载的适用于微通道换热器的制冷剂侧和空气侧的换热及压降关联式，使模型能够应用于各类工况。建立模型的控制方程，并开发一种换热-压降交替迭代的快速求解算法，基于此计算换热器性能，并用试验数据验证模型的计算精度。结果表明，基于此仿真模型计算的换热器平均换热误差小于5%，制冷剂侧平均压降误差小于10%，满足实际工程需求。

关键词: 双排对折, 微通道换热器, 计算机模拟, 算法, 试验验证

Abstract:

In this paper, a structure of double row folded type microchannel heat exchanger is presented, and a three-dimension distribution parameter model is established to analyze the performance of microchannel heat exchanger with this configuration. Based on the unique structure of double row folded heat exchanger, control volume of microchannel tube and header were divided respectively, and a path-to-path description method was used to describe the flow path of the refrigerant inside the tube. The correlations of heat transfer and pressure drop for refrigerant side and air side for microchannel heat exchanger, which are recorded in the published literature, were investigated and sorted out, so that the model could be applied to various working conditions. The governing equation of the model is established, and a fast algorithm of alternating iteration of heat transfer and pressure drop is developed. The results show that the average heat transfer error calculated based on the simulation model is less than 5%, and the average pressure drop error on the refrigerant side is less than 10% compared with experimental results, which meets the actual engineering requirements.

Key words: double row folded, microchannel heat exchanger, computer simulation, algorithm, experimental validation

中图分类号:

TK 172

王兆奇, 李孟山, 胡海涛, 魏文建. 双排对折型微通道换热器仿真模型开发[J]. 化工学报, 2021, 72(S1): 113-119.

WANG Zhaoqi, LI Mengshan, HU Haitao, WEI Wenjian. Development of simulation model for double row folded microchannel heat exchanger[J]. CIESC Journal, 2021, 72(S1): 113-119.

图/表 6

图1 双排对折型微通道换热器结构

Fig.1 Schematic diagram of double row folded microchannel heat exchanger

图2 双排对折结构控制单元划分

Fig.2 Control volume division of double row folded structure

图3 集流管控制单元划分

Fig.3 Control volume division of header

图4 基于流程的流路描述方式

Fig.4 Flow description based on path

图5 算法流程

Fig.5 Algorithm flow chart

图6 蒸发工况仿真值与试验值对比

Fig.6 Comparison between simulation value and experimental value in evaporation condition

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