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The Good Bad and Ugly of Ammonia Refrigeration

Ammonia (azane(1) or R-717) was among the early refrigerants, first used in 1850 in France(2). It was then utilized in the US in the 1860s for artificial ice production and then the first ammonia refrigeration machines were patented in the 1870s. Ammonia is one of the early chemicals to secure a lasting role as a refrigerant. There is hardly anything that we consume at breakfast, lunch, and dinner that does not pass through an ammonia refrigeration system at some point.