微细通道蒸发器空气侧对流传热传质研究

Research on Convective Heat Transfer and Mass Transfer of Evaporator in Micro/Mini-Channel

随着科学技术的发展,各种加热冷却设备呈现出向微型化方向发展的态势。微加工工艺的发展给微通道内换热的研究提供了可能。基于对我国家用空调器产品现状的分析,探讨了执行新能效标准后空调换热器采用新型强化传热技术的潜在需求。制冷剂在微细管内凝结和沸腾传热已有研究成果显示,家用空调器采用微细尺度强化传热技术,可以使换热器趋于紧凑、高效,从而使空调器满足新能效标准的要求。主要讨论蒸发器空气侧表面物性对冷凝液的影响,从而得到不同物性下的对流换热系数,并进行分析。

With the development of science and technology, various heating and cooling equipments have a development trend of micromation. Micro-fabrlcation processes make it possible to research on condensation heat transfer in micro-channels. Based on the reviewers on the present household air conditioners, the potential requirements for new heat transfer enhancernent used for household air conditioners were discussed. The investigations on condensation and boiling of refrigerants in mini/micro channels have indicated that the evaporator and condenser of air conditioner would be higher efficiency and more compact by using microchannels, and hence it could improve the coefficient of performance of air conditioners to meet the requirements of new energy conversion standurd of China. The relationship between condensation heat transfer of refrigerants and surface physical characteristics of the evaporator were pointed out and analysed in order to achieving the corresponding heat transfer coefficients.