Closed-Cycle Gas Turbine Working Fluids

[+] Author and Article Information
J. C. Lee, J. Campbell, D. E. Wright

Rockwell International/Rocketdyne Division, Canoga Park, Calif.

J. Eng. Power 103(1), 220-228 (Jan 01, 1981) (9 pages) doi:10.1115/1.3230701 History: Received January 02, 1980; Online September 28, 2009


Characteristic requirements of a closed-cycle gas turbine (CCGT) working fluid were identified and the effects of their thermodynamic and transport properties on the CCGT cycle performance, required heat exchanger surface area and metal operating temperature, cycle operating pressure levels, and the turbomachinery design were investigated. Material compatibility, thermal and chemical stability, safety, cost, and availability of the working fluid were also considered in the study. This paper also discusses CCGT working fluids utilizing mixtures of two or more pure gases. Some mixtures of gases exhibit pronounced synergetic effects on their characteristic properties including viscosity, thermal conductivity and Prandtl number, resulting in desirable heat transfer properties and high molecular weights. Typical examples of such synergetic gas mixture are helium-xenon and helium-carbon dioxide.

Copyright © 1981 by ASME
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