Patent ID: 6425250
Filing Date: 2002-07-30
Classification: F02G,F25B,Y02B

Abstract:
A method for providing refrigeration to a heat load comprising:(A) compressing pulse tube gas to produce hot compressed pulse tube gas, cooling the compressed pulse tube gas, and expanding the cooled pulse tube gas to produce cold pulse tube gas; (B) warming the cold pulse tube gas by indirect heat exchange with heat transfer medium to produce cooled heat transfer medium, and warming the cooled heat transfer medium by indirect heat exchange with refrigeration fluid to produce cooled refrigeration fluid at a first temperature within the range of from 20 to 280K; (C) providing refrigeration into the cooled refrigeration fluid to produce cold refrigeration fluid at a second temperature lower than said first temperature and within the range of from 3 to 150K; and (D) warming the cold refrigeration fluid by passing refrigeration from the cold refrigeration fluid into a heat load.