Ammonia (NH₃) | Natural refrigerants - Danfoss

Due to the toxicity and flammability of ammonia, installations using ammonia are strictly regulated. Even though these regulations ensure safe operation, reduced charges are highly recommended, especially in populated areas. One way to accommodate safety concerns is to use ammonia in conjunction with CO2 for medium or high temperatures applications or in cascade applications for low temperatures.

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Because ammonia is incompatible with copper and brass, only welded steel pipes can be used in ammonia systems. This also means that it is necessary to use either semi-hermetic compressors or fully hermetic compressors with special motor coatings or aluminium motor wires.

While ammonia is not miscible with common oils, ammonia is lighter than oil, making oil return systems fairly simple.

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Today, ammonia is primarily used in industrial refrigeration applications with high capacity charges. Low-charge ammonia systems are currently in development to better take advantage of ammonia's thermodynamic and environmental properties.

Some low-charge systems in development from Danfoss feature advanced control algorithms, ammonia-optimized heat exchangers, DX systems, and new cascade systems with CO2.

 
These applications are high capacity charges however, there are on-going efforts to develop low-charge ammonia systems in order to take further advantage of the beneficial thermodynamic and environmental properties of ammonia. Some of the efforts undertaken by Danfoss and research partners are to develop low-charge systems with new, advanced control algorithms, further development of ammonia-optimized heat exchangers, DX systems and new cascade systems with CO2.

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