Thermodynamics analysis of V-type refrigerator working by stirling cycle

THERMODYNAMICS ANALYSIS OF V-TYPE REFRIGERATORWORKING BY STIRLING CYCLE(Ph. D. Thesis)Yusuf TEKİNGAZI UNIVERSITYINSTITUTE OF SCIENCE AND TECHNOLOGYMarch 2006ABSTRACTA Stirling machine is a mechanical device operating on a closedregenerative thermodynamic cycle where cyclic compression andexpansion of the working fluid take place at different temperatures.Pistons are responsible for the flow of working fluid. The flow of theworking fluid between the working spaces is controlled by their volumechanges and this causes conversion of heat into work and vice versa.Stirling machine with different geometries and properties can beoperated as heat pumps and refrigerators. Thermodynamic analysis isnecessary in order to get better design of refrigerators running onStirling cycle. In this study, the thermodynamic analysis of a V-typeStirling cycle refrigerator is performed using control volume analysis.The Stirling cycle refrigerator consists of expansion and compressionspaces, cooler, heater and regenerator. The conservation of mass andenergy equation are written for each control volume. A computerprogram is prepared in FORTRAN, and the basic equations are solvediteratively using constant surface temperature and adyabatic boundaryconditions. The mass, temperature and density of working fluid in eachcontrol volume are calculated for working parameter given in theprogram. For different working fluids, charge pressures and enginespeeds, refrigerators cooling load, work and COP values have beencalculated and results are tabulated. Beside these two dimensional flowsimulation of the V-tipe Stirling cycle refrigerator is performed usingFLUENT computational fluid dynamics. The expansion andcompression volumes are modelled using the dynamic mesh. Thevelocity and pressure distribution obtained, are given as diagrams.Science Code : 914.1.131Key Words : Stirling cycle refrigerator, thermodynamicanalysis, simulation, control volume analysis.Page Number : 225: Prof. Dr. Ö. Ercan ATAERAdviser