大温差下印刷电路板式换热器起动过程建模与实验

doi:10.7527/S1000-6893.2022.27893

Abstract

Abstract:

A one-dimensional transient heat transfer model is developed in this study for the starting process of Printed Circuit Heat Exchangers （PCHE） at large temperature difference. The model considers the internal heat conduction process of the solid material of the printed circuit heat exchanger and is able to predict the temperature behavior of both fluid and solid materials. Transient heat exchanger experiments using N₂ as the medium on the printed circuit heat exchanger are conducted. The maximum and minimum temperature of N₂ are 450 K and 103 K， respectively. Comparison of the model prediction results with the experiment results proves the validity of the model. The average deviation of the outlet temperature at the cold side during the starting process is 11.3 K and the calculation deviations of heat transfer on both sides are within 7%. Furthermore， the model is applied to the calculation and analysis of the spatial distribution and time domain variation characteristics of the operating parameters of the printed circuit heat exchanger. The results indicate that the heat transfer between the cover plate and the core region of the printed circuit heat exchanger is important and cannot be easily ignored in the simulation of the transient process at large temperature difference. The results also show that increasing mass flow rates of fluid at both sides and decreasing the thickness of the cover plate are effective methods to shorten the response time of the starting process. Moreover， in a certain range of the mass flow rate ratio， the product of the Reynolds Number at the inlet of the printed circuit heat exchanger on both sides is an important factor affecting the response time.

Key words: printed circuit heat exchanger, starting process, one-dimensional model, large temperature difference, heat transfer

CLC Number:

V432

Zihao WANG, Jialei DU, Guozhu LIANG, Haoze WANG, Zhenyu CAI, Xiaoqiu MA. Modelling and experimental investigation into starting process of printed circuit heat exchangers at large temperature difference[J]. Acta Aeronautica et Astronautica Sinica, 2023, 44(16): 127893-127893.

Figures/Tables 19

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Re	C	n
4×10^-1~4×10⁰	0.989 0	0.330
4×10⁰~4×10¹	0.911 0	0.385
4×10¹~4×10³	0.683 0	0.466
4×10³~4×10⁴	0.193 0	0.618
4×10⁴~4×10⁵	0.026 6	0.805

参数	数值
通道长度L_a/mm	714
通道直径D_h/mm	0.7
平板厚度t_p/mm	0.8
翅片厚度t_f/mm	0.3
热侧换热通道个数	2 000
冷侧换热通道个数	2 000

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Modelling and experimental investigation into starting process of printed circuit heat exchangers at large temperature difference

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