In this paper, thermal modeling for the performance evaluation of gas turbine cogeneration system with reheat is presented. The total useful energy rate has been analyzed for Joule-Brayton cogeneration reheat cycle and the efficiency at the maximum total useful energy rate is also determined. It has been found that the dimensionless total useful energy rate and the corresponding thermal efficiency decrease with the increase of power to heat ratio. The inclusion of reheat significantly improves the overall performance of the cycle. This methodology may be quite useful in the selection and comparison of combined energy production systems from the thermodynamic performance point of view.
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