Comparative Thermodynamics for Brayton and Rankine Cycles

[+] Author and Article Information
E. W. Beans

The University of Toledo, Toledo, OH 43606

J. Eng. Gas Turbines Power 112(1), 94-99 (Jan 01, 1990) (6 pages) doi:10.1115/1.2906483 History: Received January 25, 1989; Online April 24, 2008


The thermal efficiency, work per unit mass, and work per unit volume of the simple Rankine and Brayton cycles are expressed in terms of seven independent variables using a simplified thermodynamic model. By requiring equal efficiency, equal work conditions, and the same maximum cycle temperature for both cycles, two necessary relationships are established between the seven independent variables. These two relationships along with two maximum work conditions produce a method for comparing required and selected properties. These comparisons provide useful guidelines for the selection of the cycle and cycle fluids. The comparison analysis shows that for a given application the more attractive cycle is strongly dependent upon the fluids selected.

Copyright © 1990 by The American Society of Mechanical Engineers
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