The ejectors can assist the compressor when ambient temperatures are above 20 degrees. The compressors are therefore compressing the gas from the receiver, which is at a higher suction pressure than the evaporator and this is lowering the system energy consumption. The higher the temperature the higher the pressure lift that can be reached.
The level of the pressure lift the ejector can achieve is also dependent on the ambient conditions.
In warm ambient conditions, the ejectors can lift all the gas from the evaporators into the receiver. Depending on ambient temperatures the LP ejector has different functions. The Multi Ejector LP (Low Pressure) is designed for CO 2 booster systems. Multi Ejector Low Pressure: optimizing booster system energy consumption The Liquid Ejector LE 600, is controlled in the same way, just with 4 steps. Similar at the Multi Ejector LP control the capacity in 3 kW steps and the maximum capacity that can be served is 43 kW for 4-ejector version and 93 kW for the 6-ejector version. If more capacity is required, a second Multi Ejector HP can be added, and controlled in parallel. This makes it possible to modulate capacity in 32 steps between 0 and 193 kW in 6 kW steps. The 6-ejector version has two additional 50 kW ejectors, providing a total of 193 kW of refrigeration capacity. Resulting in a total of 93 kW refrigeration capacity. The 4-ejector version has ejectors providing 6 kW, 12 kW, 25 kW, and 50 kW. The Multi Ejector HP, for example, comes in two versions. Capacity controlĮjector capacity control is achieved through a binary coupling of various capacities. On each individual ejector, a built-in non-return valve prevents backflow, removing the need for external check valves in suction lines. The characteristics of the ejectors remain the same no Is matched by using different numbers and combinations of ejectors. Multi Ejectors HP and LP are available with 4 to 6 ejectors, while the Liquid Ejector has 1 or 2. Each block has a variable number of ejectors of different sizes mounted vertically. The Multi Ejector is available in different versions, depending on the application. The Multi Ejector HP and LP ejectors is delivered with three pressure transmitters, used for pressure control in the AK-PC 782A pack controller. The coils activating the individual ejectors are available from 110 to 230 V, 50 and 60 Hz. All ejectors in the Danfoss portfolio have a high-pressure inlet (high-pressure CO 2 gas from the gas cooler), a suction inlet (from MT evaporators or suction accumulator), and an outlet for returning the gas or liquid to the receiver.
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