To Improve the Performance of a Refrigeration Compressor by Optimizing Piston Stroke and Cylinder Diameter

During the operation of a refrigeration compressor, electric power is transported from electric source to the refrigerant. Since there is a large amount of power required for the operation, it is necessary to save energy through the performance improvement. For this purpose, mathematical models consisting of nonlinear ordinary differential and algebraic equations are developed and applied for the simulation and optimization. The objective function used in optimization has various forms.However, from the vie117point of available energy,the compressor effectiveness might be a useful term to be used as a part of objective function for the performance improvement of a refrigeration compressor. Both the heat transfer between the refrigerant and the cylinder wall, and the throttling of flow in the suction and discharge passages have to be considered during the optimization as there is a close relationship among the effectiveness, the heat transfer, and the throttling of flow. The changes of cylinder diameter,d, and piston stroke,s,affect the heat transfer area of cylinder wall and the flow area of valves. Therefore, it is necessary to optimize these two dimensions for the maximization of an objective function F.