refrigerant, in the refrigeration device which works by indirect cooling, the material that transfers the heat of the cooled object to the evaporating refrigerant is called refrigerant. the refrigerant is usually liquid, and there is no phase transition in the process of heat transfer. however, some of the refrigerants are gas or liquid-solid mixture, such as binary ice. commonly used refrigerants include water, brine, ethylene glycol or propylene glycol solution, dichloromethane and trichloroethylene, generally excluding monofluorodichloromethane, which is usually used as refrigerant. only when direct refrigeration is used, refrigerant is used as refrigerant. refrigerant and refrigerant selection principle after reading these, do you have the answer in mind? in fact, generally speaking, the difference between refrigerant and refrigerant is that one can act as both refrigerant and refrigerant, while the other is only professional and refrigerant. for example, in direct refrigeration, refrigerants not only act as refrigerants, but also act as refrigerant carriers. at present, many refrigeration systems choose direct refrigeration, but direct refrigeration will have many disadvantages, such as high system pressure, more labor, greater risk and toxic effect. moreover, the refrigerants used for direct refrigeration, such as freon, are not friendly to the environment and destroy the ozone layer, and the international environmental protection organizations have clear regulations on the use of freon. the ammonia used in direct refrigeration is poisonous and harmful. once it is leaked, it will pollute the product and endanger life. so at present, many enterprises choose to use indirect refrigeration, move the unit out of the cold storage, transfer the cooling capacity through the refrigerant, reduce labor, reduce system risk, and save energy and environmental protection.