Cycle design for the Isabelle helium refrigerator

The cycle schematic for the ISABELLE Refrigerator with a simplified load is given. The subcooler section is described with a summary on the performance requirements shown with system parameters itemized. The main refrigerator uses a Claude-type cycle which is described along with detail design. State variables at each process point in the cycle are shown with flow properties and flow rates. The refrigerator is scheduled for completion and testing in 1983.