The procedure to define the efficient operation of a booster assisted ejector refrigeration system is presented. This procedure assures efficient system and ejector operation and keeps constant design refrigeration capacity. The system produces ice at a rate of 100 kg in 6 h at a temperature of −10°C using refrigerant R134a. This system is powered with solar energy and operates at a generation temperature below 90°C. This procedure includes the criterion to select the system design point, the methodology that determines system behavioral maps and the criterion of system operation. The criterion of design point selection considers an adequate generation temperature, the lower condensation temperature and the higher booster discharge pressure, considering the system energy and exergy efficiencies and the supplied energy and compression work ratios. The methodology considers system behavior in steady state with ejector operation in transition regime. The criterion for system operation considers a fixed refrigeration capacity. This implies to work in two operational regimes, one corresponds to condensation temperatures lower than its design value and other to higher values. In the first region, the system efficiency increases and the ejector works efficiently and more than the booster. In the second region, the system efficiency decreases slightly and the booster works more than the ejector despite of that the ejector has a higher efficiency. In any case, the system and ejector operate efficiently in any region.

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