Table of Contents
ISRN Renewable Energy
Volume 2011, Article ID 634025, 13 pages
http://dx.doi.org/10.5402/2011/634025
Research Article

Performance Study of Solar Air Heater Having Absorber Plate with Half-Perforated Baffles

Department of Mechanical Engineering, Faculty of Engineering and Architecture, J.N. Vyas University, Jodhpur 342011, India

Received 4 July 2011; Accepted 11 August 2011

Academic Editors: C. Cristofari and B. Mwinyiwiwa

Copyright © 2011 B. K. Maheshwari et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The paper presents a detailed mathematical model for performance prediction of a smooth duct solar air heater validated against the experimental results. Experimental study on a solar air heater having absorber plate with half-perforated baffles on the air flow side shows thermal efficiency enhancement of 28%–45% over that of the smooth duct solar air heater, which is attributed to the heat transfer enhancement (of the order of 180%–235%) due to the perforated baffles attached to the absorber plate and reduction in the mean temperature of the absorber plate by 20°C–25°C as compared to the temperature of absorber plate of smooth duct air heater. Using the mathematical model, the performance plot for the baffled duct air heater has been presented, and the effect of the variation of ambient parameters on the predicted thermal efficiency has been studied.