Patent ID: 6205812
Filing Date: 2001-03-27
Classification: F25B,F25J,Y02B

Abstract:
Method for producing product fluid in an ultra cold condition comprising:(A) compressing multicomponent refrigerant fluid, cooling the compressed multicomponent refrigerant fluid to produce cooled multicomponent refrigerant fluid, and expanding the cooled multicomponent refrigerant fluid to at least partially condense the multicomponent refrigerant fluid;(B) compressing pulse tube gas to produce hot compressed pulse tube gas, cooling the hot compressed pulse tube gas by indirect heat exchange with the at least partially condensed multicomponent refrigerant fluid to produce cooled compressed pulse tube gas and warmed multicomponent refrigerant fluid, 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;(C) 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 cooling the heated pulse tube working fluid by indirect heat exchange with warmed multicomponent refrigerant fluid to produce further warmed multicomponent refrigerant fluid; and(D) passing the ultra cold pulse tube gas in indirect heat exchange with product fluid to produce product fluid in an ultra cold condition, and then passing the resulting pulse tube gas in direct contact with the warmed heat transfer media to produce the said cold heat transfer media.