Based on the problems involved with ozone depletion and greenhouse gasses, the refrigeration industry has realized crucial changes and will have to take additional measures in the future. This is especially true for commercial refrigeration and ac plants, with their wide range of applications.
Until a few years ago, the main refrigerants used in vapor compression refrigeration machines were ozone depleting types, namely R-12, R-22, and R-502; and for special applications, R-114, R-12B1, R-13B1, R-13, and R-503.