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| Decomposing Numerical Simulation and Experimental Verification of Carbon Dioxide Micro-channel Gas Cooler |
| WU Jiang-Hong, LI Cheng, YANG Zhao-Guang |
| (School of Automotive Engineering, Guangdong Provincial Key Laboratory of Automotive Engineering, South China University of Technology, Guangzhou 510641, China) |
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Abstract 摘要：
关键词：
In order to investigate the effect of CO2 maldistribution in microchannel on the flow and heat transfer characteristics of gas cooler, decomposing numerical model of microchannel gas cooler in transcritical CO2 system was constructed and experimentally verified. The results show that the maximum flow rate nonuniformity decreases from 97% to 18% as total inlet flow rate of CO2 increases from 110 kg/h to 470 kg/h, meaning that the flow rate is the critical factor of maldistribution. The maldistribution of refrigerant flux has a significant effect on the flow characteristics of microchannel gas cooler. While to the heat transfer characteristics, its effect is not obvious. The numerical results were compared with the experimental data under different running conditions. The inaccuracy of average heat transfer coefficient ranges from 482% to 3825%, and the inaccuracy of friction coefficient ranges from 6.09% to 26.65%.
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Received: 07 March 2011
Published: 30 March 2012
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