Irreversible modified complex Brayton cycle under maximum economic condition

An irreversible complex Brayton cycle under maximum economic conditions has been investigated. The economic function has been optimized with respect to the cycle temperatures, reheat and intercooling pressure ratios for a typical set of operating conditions. It is found that there are optimal values of the intercooling, reheat and cycle pressure ratios at which the cycle attains the maximum objective function, maximum power and maximum efficiency. The maximum economic point, maximum power point and the maximum efficiency point exist but the economic function corresponding to the maximum power and maximum efficiency is found to be lower than that can be attained and vice-versa. The optimal values of different parameters corresponding to the maximum economic function are different from those corresponding to the maximum efficiency and maximum power for the same set of operating conditions. Again, all the performance parameters further enhance as the heat capacitance rates of the external reservoirs and increased, while it is found to be reverse in the case of the working fluid heat capacitance rate and the inlet temperature of the conversing combustion chamber (CCC). The objective function and efficiency are found to be the decreasing functions of the reheat pressure ratio for lower values of CCC inlet temperature while there are optimal values of the reheat pressure ratio for higher values of the inlet temperature of the CCC.