A simplified model for pulse tube refrigeration Original Research Article

Orifice pulse tube performance is analysed, first through an ideal model, second through a time dependent model, taking into account mass and heat transfer resistance. Ideal model shows that refrigeration load could be associated to an entropy flow. It quantifies also the minimum entropy production of the process, inherent to the orifice, and following that, the maximum coefficient of performance (COP) reachable: COP=T0/Tc. Simulated results given by the dynamic model are compared with experimental data obtained with helium and argon. Indicated diagrams clearly display energy exchange occurring in the process, and will be helpful for further efficient design. Second Law analysis issued from dynamic simulation proves that existing device optimisation requires higher permeability for the regenerator and better compressor.