Second law analysis of irreversible heat engines with variable temperature heat reservoirs

Analysis of irreversible heat engines, which operate between two variable temperature heat reservoirs, has been performed by means of the second law of thermodynamics. The results show that the optimal balancing between the sizes of the heat exchangers at the hot and cold ends of the engine is affec...

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Bibliographic Details
Published in:Energy conversion and management 2001, Vol.42 (2), p.189-200
Main Author: Salah El-Din, M.M.
Format: Article
Language:English
Subjects:
Applied sciences
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Theoretical studies. Data and constants. Metering
Thermodynamics, mechanics etc. For energy applications
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Summary:Analysis of irreversible heat engines, which operate between two variable temperature heat reservoirs, has been performed by means of the second law of thermodynamics. The results show that the optimal balancing between the sizes of the heat exchangers at the hot and cold ends of the engine is affected by the ratio E (or E′). Also, the maximum power output of the engine varies significantly with E (or E′). Conversely, the efficiency at the maximum power point does not depend on E (or E′). The optimal temperature ratio across the inner compartment of the heat engine depends on the inlet temperatures to the heat exchangers.
ISSN:0196-8904
1879-2227
DOI:10.1016/S0196-8904(00)00051-0