الفهرس 
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Abstract
This thesis investigates the performance of a beta-type Stirling refrigerator. The proposed refrigerator has twin tubular evaporator and condenser. The tubes of both evaporator and condenser have insertions of multiple twisted metallic tapes inside them. In the proposed refrigerator, a wire net regenerator is suggested. The working fluid is selected to be helium. Rhombic drive mechanism controls the synchronization of the reciprocation of both the displacer and the piston. A computer program in the form of a spreadsheet is prepared to solve the refrigerator cycle numerically. The results get the most suitable dimensions of the evaporator, the condenser, the regenerator, and the most suitable stroke to bore ratio of both piston and displacer. The refrigerator develops 0.000283 TR/cc, COP = 0.5297 at 800 rpm. The comparison among the present work and previous ones shows that; the present refrigerator explores an enhancement in COP up to 100%, especially at low-speed levels. Verification of the numerical modeling carried out by comparing the simulation results to experimental data. The validation shows agreement and satisfaction.