Thermodynamic Analysis and Analytical Simulation of the Modified Stirling Cycle
R. K. Ranjan, S. K. Verma
ABSTRACT: The analytical thermodynamic model of Stirling cycle engine has been developed by considering the non-isothermal characteristics instead of isothermal in expansion/compression space as the isothermal processes are very difficult to be realised in actual practice. Based on the non-isothermal characteristics of practical working Stirling engines, three modified models of Stirling cycle engine (MSE) have been proposed and simulated analytically. The thermodynamic analysis of the developed models have been carried out and the simulated results are compared with the Rallis ideal model of Stirling cycle engine, as this model describes more accurately the thermodynamic cycle of practical Stirling machines. Investigation reveals the fact that efficiency of MSE II model is enhanced by 5.22% and that of MSE III model by 10.09% whereas the power output is increased by 25.21% and 36.52% in case of MSE II and MSE III model respectively. Further, based on the performance of thermodynamic models of Stirling engine, MSE II model is found suitable for medium temperature differential Stirling engine and MSE III for high temperature differential Stirling engine.
Keywords : Modified stirling cycle engine; Non-isothermal characteristics; Power output; Thermal efficiency
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