Simulation of Conjugate Heat Transfer in Large-scale Cryogenic Environment Chambers Based on Numerical Simulation Methods

YANG Guohui; LU Di; WANG Yanan; ZHAN Dengyi; ZHENG Zijian; ZHU Yuhe; ZHAO Hongli

doi:10.7643/ issn.1672-9242.2025.11.013

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Equipment Environmental Engineering ›› 2025, Vol. 22 ›› Issue (11) : 123-134. DOI: 10.7643/ issn.1672-9242.2025.11.013

Simulation of Conjugate Heat Transfer in Large-scale Cryogenic Environment Chambers Based on Numerical Simulation Methods

YANG Guohui¹, LU Di¹, WANG Yanan¹, ZHAN Dengyi², ZHENG Zijian³, ZHU Yuhe^1,*, ZHAO Hongli^2,*

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Abstract

The work aims to investigate the cooling performance of a cryogenic environment chamber containing multiple heat sources and significant thermal mass. A numerical model of a large-scale cryogenic environment experiment chamber was established based on numerical simulation and equivalent parameter methods. The distribution characteristics of the flow field and temperature field inside the chamber at different supply air temperatures (ranging from -70 ℃ to -120 ℃) were analyzed. The results indicated that: as the supply air temperature decreased (from -70 ℃ to -120 ℃), the flow field within the chamber became more uniform, the circulating air volume increased, and the flow uniformity below the deflector plate improved significantly. Simultaneously, the temperature field distribution also showed a trend toward greater uniformity with the decreasing supply air temperature (from -70 ℃ to -120 ℃). Specifically, the temperature difference (Δt₁) within the experimental environment below the deflector plate decreased from 2 ℃ to 0.8 ℃. Due to the excellent thermal insulation properties of the chamber, the surface temperature difference (Δt_S) of the test items inside the chamber remained below 1 ℃ across all tested supply air temperatures. In conclusion, the intake air temperature significantly affects the flow field and temperature field distribution in the cryogenic environment chamber. As the intake air temperature decreases, the stagnant airflow area above the deflector plate increases, but the flow uniformity is improved. The temperature uniformity of the experimental environment below the deflector plate is also improved, and the airflow in the bottom return air duct away from the fan side becomes more uniform. Lowering the intake air temperature reduces the airflow velocity in the supply duct, resulting in a decrease in the system's circulating airflow volume.

Key words

cryogenic environment chamber / temperature uniformity / flow field distribution / conjugate heat transfer / air cooling technology / numerical simulation

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YANG Guohui, LU Di, WANG Yanan, ZHAN Dengyi, ZHENG Zijian, ZHU Yuhe, ZHAO Hongli. Simulation of Conjugate Heat Transfer in Large-scale Cryogenic Environment Chambers Based on Numerical Simulation Methods[J]. Equipment Environmental Engineering. 2025, 22(11): 123-134 https://doi.org/10.7643/ issn.1672-9242.2025.11.013

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