An Analysis of Unglazed Transpired Solar Collectors Based on Exergetic Performance Criteria

Abstract

In this paper, an exergetic performance analysis of unglazed transpired collectors (UTC), as well as an exergetic optimization of a typical UTC is performed. A steady-state model is used to calculate heat transfers and pressure drop through perforated plate and back wall. In order to maximize the exergy efficiency, the optimization procedure is carried out for some important parameters including plate hole diameter and hole pitch. The maximum efficieny of 5.42% is obtained. In spite of all thermal performance advantages, the UTC acts less effective in exergetic performance. Other parameters such as incident solar radiation, approach velocity, plate hole diameter and pitch are examined in the parametric study.

Keywords

• unglazed transpired collector, exergetic performance, optimization.