Patent ID: 6374617
Filing Date: 2002-04-23
Classification: F02G,F25B,F25J

Abstract:
A method for providing refrigeration to a product fluid comprising:(A) compressing pulse tube gas to produce hot compressed pulse tube gas, cooling the hot compressed pulse tube gas, and further cooling the cooled compressed pulse tube gas by direct contact with cold heat transfer media to produce cold pulse tube gas and warmed heat transfer media; (B) expanding cold pulse tube gas to produce ultra cold pulse tube gas and to produce a gas pressure wave which compresses and heats pulse tube working fluid, and extracting heat from the heated pulse tube working fluid by indirect heat exchange with cooling fluid to produce warmed cooling fluid; (C) providing refrigeration to product fluid by passing product fluid in indirect heat exchange with the ultra cold pulse tube gas; and (D) intercepting heat within the heat transfer media by indirect heat exchange with cryogen fluid to produce warmed cryogen fluid.