MODELING OF A CASCADE CRYOGENIC REFRIGERATOR

This paper presents a study on modeling and analysis of a cascade two-stage cryogenic refrigerator. The system is composed by two refrigeration cycles working with R404A and R23 in the high and low pressure cycles, respectively. The system contains tubing, reciprocating compressors, capillary tubes, intermediary heat exchanger, condenser, evaporator and the cabinet. The complete model is composed by a group of sub-models for each component, adopting one dimensional and steady state condition approaches. Energy balance, heat transfer and pressure drop processes in each component are modeled. Mathematical models for each component are described. A brief analysis of the simulated results is performed.