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Flow and Heat Transfer Analysis in the Solar Vacuum Collector Using Air as Working Fluid
Author(s): 
Pages: 527-529,545
Year: Issue:  6
Journal: Energy Conservation Technology

Abstract: 针对热水作工质时真空集热管内普遍存在的冻结、腐蚀等问题,本文采用空气作工质,推导了空气作工质时真空集热管的集热效率、热损系数和集热管出口温度的方程,分析了影响空气作工质时各项参数对集热器热性能的影响.通过改变集热管进口空气流量来获得尽可能高出口温度的热空气,从而降低热损系数,提高集热效率.此外,由于热空气可以直接送入干燥室干燥物料,不需要二次转换,节能效果好.由理论分析和试验结果可以预见,利用空气...
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