29-10-2014, 04:11 PM
Abstracts: A Stirling engine is a mechanical device which operates on a closed regenerative thermodynamic cycle, with cyclic compression and expansion of the working fluid at different temperature levels.Several types of Stirling engines have been introduced for different purposes, the most known and practical models are Alpha, Beta and Gamma. The working mechanism of all the three is the same and based on gas expansion at higher temperature and thermo-dynamic laws. We have decided to construct the model for gamma type because this model provides a convenient complete separation between the heat exchangers associated with the displacer cylinder and the compression and expansion work space associated with the piston. The Stirling cycle comes closest to the Carnot cycle efficiency while having a higher work ratio. Despite the fact that the efficiency may not be practical in real fabrication and testing, the Stirling engine gives the best output. The idealized Stirling cycle consists of four thermodynamic processes acting on the network of the fluid.