According to a first estimate, this corresponds to the pressure lift of the system with ejector. The intermediate pressure is selected approx. Medium pressure, absolute (estimated): 33 barįirst, a system without ejector with a standard superheat control is calculated in BITZER SOFTWARE under "R744 booster selection" (see following figure).Cooling capacity of the medium temperature compressor stage (Q o MT): 60 kW.Evaporation temperature in the medium temperature compressor stage (t o MT): -8☌.Gas cooler outlet temperature (t gc) at the design point: 35☌.In the following example, a single-stage system with one ejector is to be calculated: The intermediate pressure is determined by the suction pressure control of the compressor. The goal is to increase the pressure only to the extent allowed by the mass flow ratio of the pumping operation.įrom the characteristics of the selected ejector results the suction mass flow at the given high pressure, motive mass flow rate and intermediate pressure. The ejectors circulate the refrigerant in a similar way to a refrigerant pump. In a low lift application, the mass flow ratio is the essential selection criterion. Design example of an ejector in a low lift application.Design example of an ejector in a low lift application
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