Table of Contents
Journal of Solar Energy
Volume 2013, Article ID 370823, 9 pages
Research Article

Performance Evaluation Criterion at Equal Pumping Power for Enhanced Performance Heat Transfer Surfaces

1JIET School of Engineering & Technology for Girls, Mogra, NH 65, Jodhpur, Rajasthan 342002, India
2Jodhpur National University, Narnadi, Jhanwar Road, Jodhpur, Rajasthan, India
3Technical University Darmstadt, Darmstadt, Germany

Received 27 January 2013; Revised 1 May 2013; Accepted 15 May 2013

Academic Editor: Xin Wang

Copyright © 2013 Rajendra Karwa 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.


The existing equations for the thermal performance evaluation, at equal pumping power for the artificially roughened and smooth surfaced multitube and rectangular duct heat exchangers, have been critically reviewed because the literature survey indicates that a large number of researchers have not interpreted these equations correctly. Three of the most widely used equations have been restated with clearly defined constraints and conditions for their application. Two new equations have been developed for the design constraints not covered earlier.