平板型太阳能双效集热器空气集热性能的理论分析

Theoretical investigation of thermal performance of flat dual-function solar collector

针对两种不同结构的双效太阳能平板集热器,建立上流道和双流道两种结构双效集热器的空气集热模型,以热力学第一定律和第二定律为基础,综合考虑空气集热效率和净有效能的情况下,研究了两种空气流道结构条件下,流道高度对集热器性能的影响。结果表明,对于上流道结构的空气集热器,流道高度为15mm时,热效率和净有效能均最高,15mm是上流道式集热器的适宜流道高度;对于双流道结构的空气集热器,上、下流道高度均为15mm至25mm间时热效率和获得的净有效能最高。

In this paper mathematical model for the single duct and double duct dual-function solar col- lectors working in air heating mode has been set up. The effect of the channel depth on the energy gain and net energy gain of dual-function solar collectors has been investigated. Based on the first and second laws of thermodynamics, the optimal channel depth for single duct dual-function solar collector is suggested as 10 mm. For double duct dual-function solar collectors, the optimal channel depths should be 15--25mm to get maximum heat and energy.