Refrigerants - Refrigerants Background 1850's 1870's...

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1 Refrigerants Background 1850’s – 1870’s: ammonia, ammonia/water, CO 2 Early 1900’s: SO 2 , methyl chloride used for domestic refrigerators 1930’s: halocarbon refrigerants discovered by Midgley (R-12, R-22, R-114, R-22) Halocarbon advantages – stable compounds, favorable thermodynamic properties, safer than existing refrigerants Ammonia still used for large low-T industrial plants
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