A new approach for thermal analysis of Stirling Engine for Exhaust Waste Heat Recovery in System Ignition engine

In this study, heat recovery analysis from exhaust gases of SI engine by Stirling engine is performed. A new method is presented to evaluate the output power and efficiency of real Stirling engines. In this method, correcting functions are applied on the Schmidt equations to achieve more accurate results with respect to the adiabatic model. This approach eliminates the numerical procedures as well as the iterative solver. It is also able the results to achieve more accuracy with open-form solution. A non-linear regression is performed on the Schmidt equations to achieve the correctness factors. The correctness factors are function of structural and operational characteristics of the Stirling engine. The results show that, by installing a Stirling engine heater on the exhaust tube of SI engine 8 kW of the waste energy can be recovered in the best condition. Also, the coupled cycles enhance thermal efficiency about 4% more than ordinary one.