With the rapid development of science and technology, the energy storage cabinet plays an increasingly important role in various application scenarios, and the temperature control unit, as a key component, is crucial to maintaining the stability of the internal environment of the energy storage cabinet. In the energy storage cabinet temperature control unit, the refrigerant and the carrier refrigerant are the two core elements, and they work together to ensure the efficient operation of the energy storage cabinet temperature control unit.

　　1. Refrigerant

　　Refrigerant, also known as refrigeration working medium, is a working substance that continuously circulates in the refrigeration system and changes through its own state to achieve refrigeration. It achieves heat transfer by vaporizing after absorbing heat in the evaporator, and then releasing heat to the surrounding environment and condensing it into a liquid in the condenser.

　　The choice of refrigerant directly affects the refrigeration efficiency, environmental performance and operating cost of the temperature control unit. Common refrigerants include freon, ammonia, carbon dioxide, etc. Among them, freon has been widely used in the past because of its good chemical stability and thermodynamic properties, but due to its damage to the ozone layer, it has been gradually replaced by more environmentally friendly refrigerants.

　　The development trend of modern refrigerants is high efficiency, environmental protection and safety. New environmentally friendly refrigerants such as R410A, R134A, etc., not only have good refrigeration effect, but also have less impact on the environment, and meet the requirements of sustainable development.

　　Second, the refrigerant

　　Refrigerant, as the name suggests, is a medium used to transfer cold. In the temperature control unit, the carrier refrigerant is usually used in conjunction with the refrigerant, and the cold amount of the refrigerant is transferred to the object that needs to be cooled in the energy storage cabinet by indirect heat exchange.

　　The selection of the secondary coolant mainly considers its thermal stability, fluidity, corrosiveness and compatibility with the refrigerant and the object to be cooled. Common refrigerant is water, salt water, ethylene glycol and so on. Water is widely used because of its good heat conductivity and low cost, but it is easy to freeze at low temperatures, so it is necessary to add antifreeze. Salt water and ethylene glycol have better low temperature performance and are suitable for low temperature energy storage cabinets.

　　The carrier coolant plays the role of a bridge in the temperature control unit, which effectively transfers the cold amount of the refrigerant to the cooled object, while avoiding the problems that may be caused by direct contact between the refrigerant and the cooled object, such as corrosion and pollution.

　　Third, the synergy of refrigerant and refrigerant

　　In the temperature control unit of the energy storage cabinet, the refrigerant and the carrier coolant work together to maintain the temperature stability inside the energy storage cabinet. The refrigerant continuously absorbs and releases heat in the refrigeration cycle, and the carrier coolant transfers the cold amount of the refrigerant to various parts of the energy storage cabinet to ensure uniform temperature distribution.

　　This synergistic effect not only improves the efficiency of the temperature control unit, but also reduces the operating cost and prolongs the service life of the equipment. At the same time, through the reasonable selection of refrigerants and secondary coolants, the environmental protection operation of the temperature control unit can be achieved and the impact on the environment can be reduced.