| Summary: | 碩士 === 國立成功大學 === 機械工程學系碩博士班 === 97 === In this study, the finite-time thermodynamics method has been utilized on the performance optimization of cogeneration cycles. By using the total useful energy rate method to study the power and the useful heat output in a steady-state-flow system had been investigated. The research includes endoreversible Otto cogeneration cycle, endoreversible Atkinson cogeneration cycle, and internal irreversible Joule-Brayton cogeneration cycle. If the total useful energy-rate is an objective function on optimization, the total useful energy rate of the cycle is maximized and the efficiency at maximum total useful energy rate is also analyzed.
Moreover, the effects of various cycle parameters (i.e., pressure-ratio parameter and user’s temperature ratio) on the maximum dimensionless total useful energy rate and the efficiency at maximum total useful energy rate have been assessed. Variations of dimensionless total useful energy rate on the heat efficiency have also been analyzed. In the internal irreversible Joule-Brayton cogeneration cycle, the effects of various irreversible situations on total useful energy rate of the cycle are discussed.
Hence, the application of the total useful energy rate method for researching cogeneration cycles can not only save the consumption of energy, but reduce the industrial cost by the relation of system parameters.
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