全玻璃真空管太阳能水蒸气集热系统实验研究

设计了一种使用全真空玻璃集热管、简化CPC(非追踪式复合抛物线聚光板)集热板和金属换热套管组合的中温太阳能水蒸气集热系统.系统由60个集热单元串联而成,每个集热单元包括简化CPC集热板、全真空玻璃集热管和换热套管三部分,在全真空玻璃集热管和换热套管之间填充了一种高导热性能固液混合型导热介质增强其导热性能.研究了系统的集热性能和天气条件、集热单元级数等不同工况对系统集热性能的影响.实验结果表明:该系统能够获得200℃的高温蒸汽,集热效率达到0.332,表现出优异的集热性能,是一种有工业应用前景的太阳能水蒸气集热器,为将该高温太阳能集热器用于更广阔的领域提供了设计基础.

Experimental Research of an All-Glass Evacuated Tubular Solar Water Vapor Generator

A new-type all-glass evacuated tubular solar water vapor generator was designed and tested to provide flowing high temperature water vapor. The experimental apparatus consists of 60 linked collecting units, each mainly includes a simplified CPC, an all glass evacuated collecting tube and a heat transfer annular pipe amounted in the evacuated collecting tube. A special solid liquid mixed medium with high thermal conduction is filled between all glass evacuated tube and annular tube. The collecting performance of the apparatus was investigated for understanding the effect of weather condition conditions and collecting unit design on the vapor temperature, collecting power and system efficiency. Experimental results show that the vapor temperature in the outlet of the collector can reach 200 ℃, while the collector efficiency is above 0.332, which manifests excellent solar collecting performance. The present new solar water vapor generator demonstrates industrial potentiality and provides a good technology support for solar high temperature collecting system.