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Abstract This thesis studied the performance of the gamma-type Stirling refrigerator. The proposed refrigerator has a shell and tube evaporator and condenser. In the proposed refrigerator, a wire net regenerator is selected. The working fluid used is helium and air. Drive mechanism controls the harmonization of the exchange of both the displacer and the piston. A computer program in the form of a worksheet is equipped to solve the refrigerator cycle numerically. The results set the best dimensions of the evaporator, the condenser, the regenerator, and the most suitable diameter piston to bore ratio. The refrigerator advances 0.000285 TR/cc, COP = 0.48 at 800 rpm. The comparison between the present work and previous ones shows that; the present refrigerator discovers an improvement in COP. Comparing current work with alpha and beta types in terms of the COP of the refrigerator shows a so acceptable improvement in COP compared to the alpha and beta types. And in terms of cooling rate of the refrigerator, show a significant improvement in the cooling load for the gamma refrigerator than the beta. Confirmation of the numerical modeling by comparing the simulation results to experimental data. The validations show conformity and satisfaction. |