Table of Contents
Physics Research International
Volume 2014 (2014), Article ID 890713, 7 pages
http://dx.doi.org/10.1155/2014/890713
Research Article

Work Criteria Function of Irreversible Heat Engines

Academic Institute for Arab Teacher Training, Beit-Berl College, 44905 Doar Beit-Berl, Israel

Received 19 May 2014; Accepted 17 July 2014; Published 5 August 2014

Academic Editor: Ashok Chatterjee

Copyright © 2014 Mahmoud Huleihil. 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 irreversible heat engine is reconsidered with a general heat transfer law. Three criteria known in the literature—power, power density, and efficient power—are redefined in terms of the work criteria function (WCF), a concept introduced in this study. The formulation enabled the suggestion and analysis of a unique criterion—the efficient power density (which accounts for the efficiency and power density). Practically speaking, the efficient power and the efficient power density could be defined on any order based on the WCF. The applicability of the WCF is illustrated for the Newtonian heat transfer law (n=1) and for the radiative law (n=4). The importance of WCF is twofold: it gives an explicit design and educational tool to analyze and to display graphically the different criteria side by side and thus helps in design process. Finally, the criteria were compared and some conclusions were drawn.