Industrial refrigeration systems use ammonia for cooling. Hence they are called as ammonia refrigeration systems. Pure ammonia is dangerous to human if they are exposed to it. Proper precaution has to be taken to avoid leakage of ammonia from the ammonia refrigeration systems. Ammonia boils at -27 degree F. this property of ammonia is used for refrigeration. Ammonia is compressed and then allowed to expand and boil thus reducing the temperature to cool the system. This is the principle by which ammonia refrigeration systems work. Although ammonia is dangerous to human in pure form, most of the industrial refrigeration systems still using ammonia refrigeration.Refrigeration engineering has contributed a lot in the design of the ammonia refrigeration systems that are being used in most of the food processing industries. Safety is not compromised in the ammonia refrigeration systems as there is always a danger that worker might be exposed to ammonia anytime. Process safety management is given importance apart from refrigeration engineering.Most of the food items that you see in your dining table might have passed through the ammonia refrigeration systems in their respective processing industry. Cold storage of fruits and vegetables, meat, poultry, fish and certain beverages like wine, beer, milk, and cheeses use ammonia refrigeration systems for cooling and processing. The ammonia refrigeration is the economic form of refrigeration that is being used from the 1900s.