METHODS AND SYSTEMS FOR CRYOGENIC COOLING.

摘要

Methods and systems are provided for cooling an object with a cryogen having acritical point defined by a critical-point pressure and a critical-point temperature.A pressure of the cryogen is raised above a pressure value determined to providethe cryogen at a reduced molar volume that prevents vapor lock. Thereafter, thecryogen is placed in thermal communication with the object to increase a temperatureof the cryogen along a thermodynamic path that maintains the pressure greaterthan the critical-point pressure for a duration that the cryogen and object arein thermal communication.