Finite time thermodynamics of real combined power cycle operating between internal combustion engine and Stirling engine with heat leak

In the applied research of the distributed power station system, according to the principles of the total energy system and the cascade utilization of energy, a thermodynamic model of the endo-reversible combined power cycle with the heat leak and the irreversible heat transfer process operating between the internal combustion engine and the Stirling engine was investigated based on the theory of the finite time thermodynamics. The expressions about power output and thermal efficiency were derived, which were denoted by the compression ratio and temperature ratio and other parameters. The relations between power output and efficiency and the effect of heat leak and other parameters on the performance of the combined cycle were analyzed by detailed numerical examples. The obtained results enlarge the scope of the theory of the finite time thermodynamics and provide a basis for the performance study of the practical combined power cycle.