Performance optimization of a linear phenomenological law system Stirling engine

The power and efficiency performance analyses and optimization of a Stirling engine with heat resistance, heat leakage, regeneration loss and mechanical losses are carried out in this paper by using the combination of Senft's mechanical efficiency model with finite time thermodynamics analysis method. The analytical formulae for indicated power, shaft power, thermal efficiency and brake thermal efficiency for the Stirling engine are derived by assuming that the heat transfer at finite temperature difference between the heat reservoirs and the working fluid obeys the linear phenomenological heat transfer law. The optimal operating regions for shaft power and break thermal efficiency are obtained and the influences of heat leakage, regeneration loss and mechanical friction losses on cycle performance are investigated through numerical calculations. The obtained results are expected to provide theoretical guidelines for the optimal design and operation of practical Stirling engines.