基于板式热管的复合容积式换热器的换热性能优化实验研究

Heat transfer performance optimization of composite displacement heat exchanger based on plate heat pipes

基于板式热管的复合容积式换热器是一种以平板微热管阵列为基本换热单元,结合容积式换热器与板式换热器优点构建的新型换热器。但平板微热管的蒸发端与冷凝端传热量差异导致该类换热器的蒸发端与冷凝端的换热匹配仍存在问题。在已有研究结果的基础上,提出了在新型换热器蒸发端热管上添加铝肋片及在蒸发端入水口添加引流道2种优化方案,并通过相应实验来验证这2种方案的效果。实验数据分析表明,肋片优化换热器的换热性能更好。当换热器换热量为1 500 W时,肋片优化换热器的效能可达0.4,■效率可达0.68,通过与原复合容积式换热器进行数据对比,肋片优化后的换热器在使用中具有更好的换热性能。

The composite displacement heat exchanger based on the plate heat pipe is a new type of heat exchanger using the flat micro heat pipe array technology as a basic heat exchange unit and combining the advantages of the displacement heat exchanger and the plate heat exchanger.The difference of heat transfer rate between the evaporating and condensing ends of the flat micro heat pipe results in some problems of heat exchange matching between the evaporating and the condensing ends.Based on the results of previous studies,proposes two optimal schemes of adding aluminum fins on the heat pipe of the evaporating end of the new heat exchanger and adding the drainage channel to the water inlet of the evaporating end.Verifies the results of the two schemes by the corresponding experiments.The experimental data analysis shows that the optimal finned heat exchanger has better heat transfer performance.When the heat exchange rate is about 1 500 W,the efficiency can be 0.4,and the entransy efficiency can be 0.68.Compared with the prototype composite displacement heat exchanger,the optimal heat exchanger has better practical heat transfer performance.