Ammonia liquid supply refrigeration system
(pump liquid supply) is usually used in large-scale cold storage refrigeration systems. Due to the large amount of ammonia charged, domestic use of ammonia liquid supply refrigeration system accidents frequently occur, resulting in huge risks and safety supervision pressure for cold storage operation. , The situation of ammonia supply liquid refrigeration system needs to be improved urgently.

Freon refrigeration system
It usually used in small and medium-sized cold storage refrigeration system, which can be supplied by pump or expansion valve. Due to the ozone destruction and global warming potential of Freon (most of the Freon refrigerants currently allowed to use in various countries have an ODP of 0, but still have a high GWP), Freon is constantly being phased out and used in the world, and the industry will tend to use natural chemicals. substance as a refrigerant.

NH₃/CO₂ cascade system
as a refrigeration system using pure natural working fluid, has a small ammonia charge. The disadvantage is that the pressure of CO₂ in the process of heat exchange between NH₃/CO₂ is extremely high, which can easily lead to equipment and system failures, and even damage the safety of the equipment room.

NH₃/CO₂cooling system
as an emerging environmental protection refrigeration system,NH₃/CO₂are natural working fluids from nature. In addition, the filling amount of NH₃ in the system is small, which greatly reduces the potential safety hazards of equipment and personnel. CO₂ refrigerant is harmless to human body, and can also be directly contacted without damaging food.