百叶窗式翅片微通道蒸发器结霜研究

Frosting research of louvered fin microchannel evaporator

为提高结霜工况下百叶窗式翅片微通道蒸发器的换热性能,利用CFD软件对微通道蒸发器进行数值模拟,分析翅片间距(1.3~2.1 mm)、翅片高度(8.0~12.0 mm)、百叶窗角度(23°~31°)以及百叶窗间距(1.15~2.07 mm)对微通道蒸发器在结霜环境下的性能影响。结果表明:较小的翅片间距虽然在干工况下可以提高蒸发器的换热性能,但却不利于其在结霜工况下持续稳定运行,而较大的翅片高度在两种工况下都可以提升蒸发器的换热能力。最后得出当翅片间距为2.1 mm、翅片高度为12.0 mm、百叶窗角度为27°、百叶窗间距为1.61 mm时,百叶窗式翅片微通道蒸发器在结霜工况下具有良好的换热性能。研究结果为结霜环境下微通道蒸发器设计提供参考。

In order to improve heat exchange performance of louvered fin microchannel evaporator under frosting conditions, CFD software was used to carry out numerical simulation on the microchannel evaporator, and the effects of fin spacing(1.3 to 2.1 mm), fin height(8.0 to 12.0 mm), louver angle(23° to 31°) and louver spacing(1.15 to 2.07 mm) on the performance of the evaporator under frosting conditions were analyzed. The results show that smaller fin spacing can improve heat exchange performance of evaporator under dry conditions, but it is not conducive to continuous and stable operation under frosting conditions, and higher fin height can improve heat exchange capacity of evaporator under both conditions.It is concluded that the louvered fin microchannel evaporator has good heat exchange performance under frosting conditions when the fin spacing is 2.1 mm, the fin height is 12.0 mm, the louver angle is 27° and the louver spacing is 1.61 mm. The research results provide reference for the design of microchannel evaporator in frost environment.