Optimum Operation of Irreversible Carnot Heat Engines of Finite Size at Maximum Power Output

In this article I consider the optimum performance at the maximum power output of internally and externally irreversible heat engines of finite size in which heat transfer is proportional to the difference of temperature to an n-power. For the case n = 1, where heat transfer is Newtonian heat conduc...

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Bibliographic Details
Published in:Energy sources 1996-04, Vol.18 (3), p.323-331
Main Author: Ozkaynak, Suleyman
Format: Article
Language:English
Subjects:
Applied sciences
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Heat exchangers
Heat transfer
irreversible heat engine
maximum power
optimal efficiency
Q1
Temperature
Theoretical studies. Data and constants. Metering
Thermodynamics, mechanics etc. For energy applications
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Summary:In this article I consider the optimum performance at the maximum power output of internally and externally irreversible heat engines of finite size in which heat transfer is proportional to the difference of temperature to an n-power. For the case n = 1, where heat transfer is Newtonian heat conduction, the hot-end / cold-end heat-exchanger size ratio is less than unity. For the case n = 4, which corresponds to radiative heat transfer, the values of design parameters are obtained from the numerical solution of two coupled nonlinear equations. For a radiative heat engine of finite size, the upper limit to the optimum efficiency at maximum power output is found to be 0.339.
ISSN:0090-8312
1521-0510
DOI:10.1080/00908319608908771