Ejectors

Basically, the increase in systems-efficiency derives from two factors:

1. The refrigeration system is designed in such a way, that the LT and MT evaporators are operated in “semi-flooded” mode e.g., on the outlet of the evaporators, the refrigerant is still partially liquid (overfeed, no superheat). Due to this operating mode, the evaporating temperature can be raised by up to 8K compared to standard systems working with superheat.
2. Driven by the pressure differential caused by the expansion from high- to medium-pressure, the ejectors carry liquid or gaseous refrigerant. Liquid refrigerant from the suction-accumulator of the MT-system is fed back to the semi-flooded LT and MT evaporators whereas the gaseous refrigerant is compressed to high pressure by the parallel-compressors.

The combination of ejectors and parallel-compression makes it now possible to recover the energy loss caused by expansion from high- to medium-pressure.

Ejectors are taking the refrigeration-technology a giant step ahead and will contribute to an even safer and more reliable systems operation. Just need to know how!