The Effect of Operating Parameters on the Performance of a Steam Ejector Refrigeration System with Barometric Condenser.

Document Type : Research Studies

Author

Mechanical Power Engineering Department., Faculty of Engineering El-Mansoura University., Mansoura., Egypt

Abstract

The main the performance of main concern of this work is to investigate experimentally the effect of operating parameters and primary nozzle position the steam ejector refrigeration system with barometric condenser. In this study, a steam ejector refrigeration system of 7.0 TR (24.42 kW) cooling capacity was used. The boiler pressure of 600 to 800 kPa, condenser temperature of 30 C to 48 C and, evaporator temperature of 6°C to 1/C are used. The primary nozzle is constructed so that it can be movable inside the mixing chamber The experimental results of this work show that the entrainment ratio and coefficient of performance were found to be functions of steam-generator pressure, condenser temperature (back pressure) and evaporator temperature. The coefficient of performance increases with increasing of boiler pressure, evaporator temperature and decreasing of condenser temperature. An increase in COP (cooling capacity) can be achieved by refracting the nozzle from the mixing chamber as the condenser pressure (temperature) increase without changing either the evaporator or boiler temperatures. In practice, the nozzle position may be automatically controlled by monitoring the saturated temperatures and pressures in the boiler, evaporator and condenser. A new experimental correlation was proposed for predicting the coefficient of performance related to the motive steam pressure, condenser pressure and evaporating pressure.

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MEJ- Mansoura Engineering Journal
Volume 30, Issue 3
September 2005
Pages 1-12

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