Thermoeconomics and the Design of Heat Systems

[+] Author and Article Information
Y. M. El-Sayed

Mechanical Engineering, Assiut University, Assiut, United Arab Republic

R. B. Evans

Thayer School of Engineering, Dartmouth College, Hanover, N. H.

J. Eng. Power 92(1), 27-35 (Jan 01, 1970) (9 pages) doi:10.1115/1.3445296 History: Received May 05, 1969; Online July 14, 2010


This paper formulates the interactions between thermodynamics and economics for complex systems in a manner which assures a wise use of nonrenewable energy resources. The concept of “essergy” (generalized potential work) is used to reduce all thermodynamic processes to a common basis of evaluation and comparison. The concept of “internal economy” is used as a means of estimating the economic value of essergy, thus permitting a designer to trade essergy dissipation against capital expenditure in the main dissipative zones of a thermodynamic system. This approach extends the classical optimization problem of balancing running expenses against fixed charges of single-zone, single-degree-of-freedom systems to stagewise as well as interconnected multi-zone multidegrees-of-freedom systems. A companion paper discusses some detailed applications.

Copyright © 1970 by ASME
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