泵控热冷混合波纹板式换热器性能测试及其主参数评价

Performance test and main parameter evaluation of pump controlled heat and cold mixed corrugated plate heat exchanger

以热冷混合波纹板式换热器为研究对象,搭建实验测试平台,提出用总压降、换热效能、传热量与消耗泵功比值和流量分布不均匀系数四个性能指标,评价实验测试的板式换热器性能。研究结果表明:板式换热器都发生总压降随质量流量提高而增大。随着波纹倾角的增大,总压降也随之提高。当质量流量保持恒定时,大波纹倾角换热器达到最大效能状态,小波纹倾角时换热效能最低。当波纹倾角增大后,获得更高的换热效能。60°换热器表现出最高的温差利用效率。提高质量流量,板式换热器Q/N比值发生减小,形成更平缓曲线。混合型换热器获得比其他单一纹倾角更高的Q/N比值。随着波纹倾角的增大,不均匀系数速率也更快。对同一板式换热器进行测试发现,当质量流量增加时,不均匀系数也持续提高。

Taking the heat and cold mixed corrugated plate heat exchanger as the research object,an experimental test platform was built,and four performance indexes were proposed to evaluate the performance of the experimentally tested plate heat exchanger,including the total pressure drop,the heat transfer efficiency,the heat transfer and pump work consumption ratio and the non-uniform coefficient of flow distribution.The results show that the total pressure drop of plate heat exchanger increases with the increase of mass flow rate.With the increase of the corrugation angle,the total pressure drop also increases.When the mass flow rate remains constant,the heat exchanger with large corrugated angle reaches the maximum efficiency,and the heat exchanger with small corrugated angle reaches the lowest efficiency.When the corrugation angle increases,higher heat transfer efficiency is obtained.The 60°heat exchanger shows the highest utilization efficiency of temperature difference.With the increase of mass flow rate,the Q/N ratio of plate heat exchanger decreases and a more gentle curve is formed.The Q/N ratio of the mixed heat exchanger is higher than that of other single grain angles.With the increase of the corrugation angle,the rate of non-uniformity coefficient is also faster.It is found that when the mass flow rate increases,the non-uniformity coefficient continues to increase.