中文摘要：

本文提出了一种采用微细通道的平板式集热板/蒸发器,它可以从太阳和环境空气二方面获取热量。其主要特点是采用树形分支模型,由两块铝板冷轧吹胀而成,减小了接触热阻,提高了集热板的换热系数。本文建立了该集热板/蒸发器的数学模型并进行了热性能分析,深入研究了不同环境工况条件下该热泵热水系统的性能,包括系统性能系数（COP）、集热板集热效率、加热时间等运行参数的变化特性。结果显示,将150 L水从15℃加热到50℃时,系统全年各月的平均COP为4.76,平均加热时间为314 min,环境温度的升高和太阳辐射强度的降低会使集热效率显著增加。

英文摘要：

In this paper a new flat-plate collector/evaporator was presented by using microchannel to gain heat from both solar radiation and ambient air. Its main characteristic was using the model of tree branch. The collector/evaporator was made of two pieces of aluminium plates by using the method of cold-rolled huff, which could reduce the contact thermal resistance and improve the heat transfer efficiency of the collector. A simulation model of the collector/evaporator was developed and its thermal performance was analyzed. The performances of heat pump hot water system were evaluated experimentally under different ambients, including heat pump coefficient of performance （COP）, heat collecting efficiency and heating time of hot water, etc. The results showed that heating 150 L water with the heat pump from 15℃ to 50 ℃, the COP of the whole year was 4.76, and the heating time was 314 min all year around. Meanwhile the heat collecting efficiency increased evidently with the ambient temperature increasing and solar radiation intensity decreasing.