S. Kumar Tyagi , and J. Chen
Modi ed irreversible Brayton cycle, isothermal heat addition, regular combustion chamber, converging combustion chamber, regenerator
The irreversible cycle model of a modified regenerative Brayton heat engine has been established for the finite heat capacities of external reservoirs. The external irreversibility is due to finite temperature differences between the heat engine and the external reservoirs, and the internal irreversibilities are due to the nonisentropic compression and expansion processes in the compressor and turbine, respectively, and the regenerative heat loss. The thermoeconomic function, which is defined as the power output divided by the total cost plus the running and maintenance costs of the system, has been optimized with respect to the cycle temperatures, and the optimum performance parameters are calculated for a typical set of operating conditions. The authors find that the effect of compressor efficiency is more than that of the turbine efficiency on all the performance parameters. They also find that the effect of isothermal side heat capacitance rate is more pronounced than that of all the other parameters on the performance of the cycle. There is seen to be an optimal relation between the various heat capacitance rates in different reservoirs and within the heat engine for which the cycle attains the optimum performance.
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