ABSTRACT

The present article is focused to improve the thermal performance of solar air heater using Liquid crystal thermography (LCT) approach, an improved type solar air heater comprises of winglet type rib roughened surface. In the present case, an experimental analysis and its effects on heat transfer and collector efficiency are examined using non-dimensional roughness parameters taken as relative roughness pitch (P/e) ranges between 5–12, attack angle (α) values of 30 degree-75 degree and relative roughness width (W/w) ranges between 3–7.These experimental results when compared with the smooth channel was improved by 17 % to 46 % under the given conditions.

摘要

本文重点采用液晶热成像 (LCT) 方法改善太阳能空气加热器的热性能，改进型太阳能空气加热器包括小翼型肋粗糙表面。在本案例中，实验分析及其对传热和集热器效率的影响使用无量纲粗糙度参数进行检查，相对粗糙度间距 (P/e) 范围在 5-12 之间，攻角 (α) 值为 30 度-75 度和相对粗糙度宽度 (W/ w ) 介于 3–7 之间。在给定条件下，与光滑通道相比，这些实验结果提高了 17% 到 46%。