of the refrigerant in the refrigerating air conditioning system is to transfer thermal energy, the cooling effect of the working fluid is generated. In the air conditioning system, through evaporation and condensation, so that the heat transfer of a substance. Commonly known as Freon. Usually the secondary refrigerant and the refrigerant collectively refrigerant in the refrigerating air conditioning system to transfer thermal energy to produce cooling effect. Freons into a gas is an easy endothermic, exothermic and easily becomes a liquid material. Early as Freon refrigeration plant with ammonia gas, ammonia when compressed, heat into the liquid; reduced pressure when the high pressure liquid to a gas, will be endothermic. Everyday common air-conditioners, which are used Freon CFCs, but CFCs previously used, will destroy the ozone layer, scientists have developed currently does not destroy the ozone layer CFCs.
1. Advantages coolant
1) a strong ability brine.
Corrosion weak corrosion resistance of the metal apparatus fully meet national standards. Long-term use will not cause serious corrosion damage to equipment. Valve leakage loss can be reduced, and the maintenance work pipe perforation energy saving due to the strong antifouling ability. Small scale layer deposition, can beAgents to improve the brine coolant effect, reducing power consumption, thus saving energy.
2) a low freezing point, low volatility. Therefore, in the long-term recycling process, small evaporation losses. Small loss of coolant agent.
3) non-toxic, odorless, water content not perishable smelly chemicals. Long-term use does not produce side effects on humans and the environment. .
Select 2 where the brine to be considered
① stable, less corrosive;
④ large heat transfer coefficient, i.e. thermal conductivity and thermal capacity should be large, the viscosity is smaller;
② safe and nontoxic, inexpensive;
③ low freezing temperature, the cooling must be below the operating temperature.