Performance Analysis of Integrated Micro-Channel Heat Exchanger

doi:10.12141/j.issn.1000-565X.220389

Abstract

Abstract:

In order to improve the performance of the integrated micro-channel heat exchanger, this study established the steady-state heat transfer model of an integrated micro-channel heat exchanger, and studied the influence law of the structural parameters and operation parameters on it. The integrated micro-channel heat exchanger used R245fa as working medium. It studied the effects of heat exchanger and heat exchanger heat pipe spacing on the total thermal resistance and air-side pressure drop of the system by using the model, which was verified by experiments previously. The results show that when the evaporation section air volume of the integrated micro-channel heat exchanger is 0.41 m³/s, condensing section air volume is 0.21 m³/s and the total thermal resistance of the heat exchanger system is 0.038 0 m²·K/W. With the increase of circulating air volume in the condensing section and the evaporation section, the air-side pressure drop of the micro-channel heat exchanger increases, and the total thermal resistance decreases. The downtrend of the total thermal resistance of the micro-channel heat exchanger decreases gradually with the increase of air volume. In scope of this research, it is concluded that the appropriate air volume in the evaporation section is 0.45 m³/s, and that in the condensation section is 0.69 m³/s. With the increase of the integrated micro-channel heat exchanger heat pipe spacing, the total thermal resistance of the micro-channel heat exchanger increases, and the air-side pressure drop of the micro-channel heat exchanger decreases in the evaporation section. When the heat exchanger heat pipe spacing is 6 mm, the comprehensive performance of the integrated micro-channel heat exchanger is the best. The research results provide a reference for the design of cooling equipment for communication base stations and the optimization of the structure and control parameters of the micro-channel heat exchanger.

Key words: micro-channel heat pipe, heat exchanger, heat transfer, pressure drop

CLC Number:

TK124

GAN Yunhua, LIU Runxi, YUAN Hui, et al. Performance Analysis of Integrated Micro-Channel Heat Exchanger[J]. Journal of South China University of Technology(Natural Science Edition), 2023, 51(3): 13-21.

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仪器	规格	范围	准确度
数据采集模块	NI cDAQ-9197
热电偶输入模块	NI 9213
热电偶	K型	0~120℃	±0.4%
空气压力计	Fluke 922	±4 000 Pa	±1%
空气流速计	Fluke 922	1~80 m/s	±2.5%

结构参数	数值		数值
换热器长/mm	298	热管厚/mm	3
换热器宽/mm	40	热管宽/mm	36
蒸发段高度/mm	316	热管长/mm	578
冷凝段高度/mm	300	换热器热管间距/mm	10
热管内孔数/个	23	矩形翅片间距/mm	3
热管数/根	23	矩形翅片厚度/mm	0.2

方法	ΔP₁/Pa	θ_out2/℃	θ_in1/℃
相对误差/%	5.19	2.03	5.66
实验	16.00	34.04	58.88
仿真	16.83	33.35	62.21

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