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为强化微通道换热器换热效果,建立了三维双层微通道换热器模型,通过优化分析计算得出微通道最佳设计尺寸。在底部热流密度qw=100W·cm-2时,最优占空比K=74%,下层通道高度Hc1=0.5mm,上层通道高度Hc2=0.9mm,其最高温度分布于受热面中部,最大温差比未经优化时降低20.37%。并对比了凹槽微通道与普通微通道的换热特性,结果表明,在入口速度大于3m/s时,凹槽微通道换热效果比普通微通道换热效果好。
In order to strengthen the heat exchange effect of the microchannel heat exchanger, a three-dimensional double-layer microchannel heat exchanger model was established, and the optimal design dimension of the microchannel was obtained through optimization analysis. The optimal duty cycle K = 74% at the bottom heat flux qw = 100W · cm-2, the height of the lower channel Hc1 = 0.5mm and the height of the upper channel Hc2 = 0.9mm. The maximum temperature is distributed in the middle of the heated surface, 20.37% lower than unoptimized. The heat transfer characteristics of the microchannels and ordinary microchannels were compared. The results show that the microchannels have a better heat transfer efficiency than the microchannels at inlet velocities greater than 3m / s.