Ammonia Refigration
Ammonia, a naturally-occurring gas composed of hydrogen and nitrogen, belongs to a class of refrigerants considered natural refrigerants; which also includes hydrocarbons, water, air, and carbon dioxide. As their name implies, these are naturally-occurring substances capable of refrigeration; they are all environmentally friendly with negligible global warming potential and ozone depletion potential, with ammonia being harmless for the environment. This is especially true when compared to the synthetic refrigerants that have been popular for the last century...
Liquid anhydrous ammonia intended for refrigeration is stored under pressure, usually in a tank. Release of the pressure on the ammonia results in rapid vaporization. The vaporization process results in cooling much as evaporation of water from a surface do, the temperature drops to the normal boiling point of anhydrous ammonia about -33⁰C. In fact, ammonia’s thermodynamic properties allow it to outperform synthetic refrigerants in most applications