Study of the C.O.P. of steam jet refrigeration unit as compared to vapor compression unit

The present study has been carried out to investigate the performance of the steam jet refrigeration system at various operating conditions, and to compare the C.O.P. results with that of Absorption system.

The study includes design analyses of the ejector performance. The performance enhancement options and desired ejector geometry are also examined. The coefficients of performance for a simple ejector was found to range between (0.5 to 1.168) for the cooling mode and (1.5 to 2.168) for the heating mode at a sample operating condition in which the boiler temperature varies between (100-150oC), Condenser temperature between (45-60oC), and evaporator temperature between (3-9oC). Theoretical comparison of the C.O.P. was made between the Steam jet refrigeration system and Absorption system. The results show that the C.O.P. of the two systems decreases with condenser temperature rise, but the C.O.P. of the former system is larger than that of the second, and the C.O.P. of the former was found to decrease with evaporating temperature rise, while the C.O.P. of the second system increase. For the steam jet refrigeration system it was found that the secondary vapor mass flow rate increases with increasing boiler temperature and ejector throat area, and it decrease when condensing and evaporating temperatures increases.