Refrigerants and coolants of air conditioning systems
Considerated are the main mean of refrigerants and coolants in air conditioning and refrigeration equipment. Also considered the standard set by international organizations for designation to refrigerants. Are considerate the classification of refrigerants impact on the ozone layer of the Earth, which was proposed by the Montreal Protocol in 1987. Classification implies three main groups of refrigerants: chlorofluorocarbons, hydrochloric fluorocarbons, hydrofluorocarbons. Are described and presented basic properties of refrigerants in table: composition, the potential depletion of the ozone layer and global warming, temperature glide and flammability. Are described the basic meaning of the temperature glide based on PI diagrams real azeotropic refrigerant R22 and zeotropic R407C. Are designated classification coolants for their intended purpose, state of aggregation, operating temperature range, freezing point? The final table are summarized the freezing point of aqueous solutions of refrigerants depending on their concentration.