整体翅片式微通道换热器的数值模拟

采用CFD数值模拟的方法,对整体翅片式微通道换热器空气侧的流动与传热特性进行研究,用场协同的原理分析翅片参数(长度、高度、间距)对换热器性能的影响,并与传统微通道换热器空气侧性能进行对比。结果表明:在考查的翅片尺寸范围内,随着翅片长度的缩短、高度的增加、间距的减小,温度场和速度场的协同性随之改善,有利于换热效果的提高;与传统的微通道换热器相比,整体翅片式微通道换热器空气侧换热性能变差,但是阻力大大降低,总体性能有所改善。

Numerical analysis on integrated fin and micro-channel heat exchanger

The air-side heat transfer and flow characteristics of the integrated fin and micro-channel heat exchanger are analyzed using CFD numerical simulation. The effect of fin size parameters including fin length,fin height and fin pitch is analyzed by field synergy principle. The new heat exchanger is also compared with the traditional micro-channel heat exchanger on the airside performance. The result shows that within the size of the re- searched fin,the synergy of temperature field and velocity field can be improved if the fin length decreases, the fin height increases and the fin pitch decreases, which makes better heat exchange effects. Compared with the traditional micro-channel heat exchanger, though the air-side heat transfer coefficient of the integrated fin and micro-channel heat exchanger is lower, air-side pressure drops dramatically. Thus, the air-side overall performance of in- tegrated fin and micro-channel heat exchanger is better than that of the traditional micro- channel heat exchanger.