PERFORMANCE-CHARACTERISTICS OF HCFC-123 EJECTOR REFRIGERATION CYCLES

Ejector refrigeration systems can use low grade thermal energy, at tem peratures as low as 60 degrees C, to provide space cooling. Since this waste energy is widely available and the cost of its supply is neglig ible in many cases, cooling costs can be lower than conventional syste ms, which makes the method very attractive. The present study describe s a computer simulation model for ejector refrigeration systems that w as developed using an existing ejector theory. This model allows for i nternal irreversibilities within the ejector to be included and caters for the addition of a regenerator and a precooler for improving the s ystem coefficient of performance. The study shows that HCFC-123 is a s uitable replacement for CFC-11 in this application. Results also indic ate that the use of a variable geometry ejector can maintain the optim um performance of refrigeration systems when operating conditions chan ge.