Which R number represents ammonia?

Ammonia is identified by the refrigerant designation R-717. This designation is based on the chemical formula for ammonia, which is NH₃. Ammonia is notable for its use in refrigeration systems due to its efficient thermodynamic properties, as it has a high latent heat of vaporization and can be used in both industrial and commercial refrigeration applications.

The other refrigerants mentioned serve different purposes and are composed of different chemical compounds. For example, R-123 is a hydrofluorocarbon (HFC) used primarily in chillers, R-22 is also an HFC commonly used in residential air conditioning systems, and R-744 refers to carbon dioxide, which is used in some specialty refrigeration systems. Understanding the specific identification of refrigerants is essential for their appropriate applications in the refrigeration and HVAC fields.