A simplified model for pulse tube refrigeration

Orifice pulse tube performance is analysed, first through an ideal model, s econd through a time dependent model, taking into account mass and heat tra nsfer resistance. Ideal model shows that refrigeration load could be associ ated to an entropy flow. It quantifies also the minimum entropy production of the process, inherent to the orifice, and following that, the maximum co efficient of performance (COP) reachable: COP - T-0/T-c. Simulated results given by the dynamic model are compared with experimental data obtained wit h helium and argon. Indicated diagrams clearly display energy exchange occu rring in the process, and will be helpful for further efficient design. Sec ond Law analysis issued from dynamic simulation proves that existing device optimisation requires higher permeability for the regenerator and better c ompressor. (C) 2000 Elsevier Science Ltd. All rights reserved.