A Stratified Flow Model for Adiabatic Losses in Regenerative Thermal Devices

[+] Author and Article Information
L. Bauwens

Department of Mechanical Engineering, The University of Calgary, Calgary, Alberta, Canada T2N 1N4

J. Energy Resour. Technol 117(2), 150-155 (Jun 01, 1995) (6 pages) doi:10.1115/1.2835331 History: Received September 19, 1993; Revised January 19, 1995; Online January 22, 2008


A model has been developed for regenerative thermal devices such as Stirling engines and refrigerators, in which, while the heat exchangers are modeled as fully isothermal, the flow in the cylinders and dead spaces is modeled as adiabatic, one-dimensional, and stratified. Pressure is assumed to be spatially uniform, so that the two remaining conservation laws refer to mass and energy. It is shown that under the proposed assumptions, the conservation laws can be integrated in closed form with respect to the space variable, leaving only time integration to be performed numerically. As a result, the numerical integration is very cost-effective, sufficiently so that the resulting program can be used to chart large portions of the parameter space relatively quickly on widely available engineering workstations.

Copyright © 1995 by The American Society of Mechanical Engineers
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