Analysis and Design of an Air-Cycle Microclimate Cooling Device

[+] Author and Article Information
M. M. Rahman

Department of Mechanical Engineering, University of South Florida, 4202 East Fowler Avenue, Tampa, FL 33620-5350

J. Energy Resour. Technol 118(4), 293-299 (Dec 01, 1996) (7 pages) doi:10.1115/1.2793876 History: Received June 18, 1993; Revised August 19, 1996; Online November 06, 2007


This paper presents an innovative concept of using air-cycle technology for the development of a microclimate cooling device for use by soldiers in the battlefield. The device is an integrated heat engine and heat pump which supplies air at a prescribed temperature and humidity for personal cooling of a soldier wearing protective ensembles, generates electrical energy to power communication equipment, and produces drinking water by condensing atmospheric moisture which may be very useful in desert warfare. It consists of a centrifugal compressor, two turbines or expanders, a combustion chamber, three heat exchangers, a water separator, and an electric generator. Atmospheric air is used as the working fluid in both the engine and cooling loops and diesel is used as the fuel for combustion. A detailed thermodynamic analysis and design optimization was performed. It was found that the system efficiency increases with operating pressure ratio, attains a maximum, and decreases with further increase of pressure ratio. The system efficiency was found to be also dependent on the air-fuel ratio, and the maximum efficiency was found to occur at a specific air-fuel ratio, for any given pressure ratio. The optimum operating condition determined from the thermodynamic analysis was used to outline a detailed design of the system.

Copyright © 1996 by The American Society of Mechanical Engineers
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