An Experimental Study On Auto-Cascade Refrigeration System With A Rectification Column

Auto-cascade refrigeration system is a kind of refrigeration method, in which mixture refrigerant is employed and only one-stage compressor is required. Refrigerants with different evaporation temperature are separated by its special structure comparative to traditional systems, which does result to realize low temperature. Auto-cascade refrigeration can be applied in many fields such as cryoelectronics, blood and organ conservation, food freeze-drying and liquefaction and so on.The focus of the theis is showed as follows:1 The research and development history in the field of Auto Cascade Refrigeration Cycleis reviewed. A new one with a rectifying column is studied based on previous auto-cascaderefrigeration cycle.2 An experimental apparatus with rectification column has been set up and experimentshave been successfully carried out. Environment-friendly non-azeotropic refrigerantmixture can be separated by its special rectification column part in the Auto CascadeRefrigeration Cycle. As the same time, lubricating oil can be successfully separated fromrefrigerant mixture. The performance of Auto Cascade Refrigeration Cycle is investigatedunder different operation conditions of refrigerant components, compositions, opening ofmain throttle valve and the return fluid extraction ratio of the rectifying column.According to a series of experimental data, the Auto Cascade Refrigeration Cycle with rectification column has been detailedly studied in order to improve COP and run smoothly in the refrigeration temperature of -80C. All the experimental data can be used as the base to future research.