What is the refrigeration number for NH3?

The refrigeration number for NH3, which is ammonia, is designated as R717. This classification is important in the field of refrigeration and HVAC (Heating, Ventilation, and Air Conditioning) because different refrigerants have specific properties that make them suitable for various applications. Ammonia, or R717, is known for its efficiency and effectiveness as a refrigerant, particularly in commercial and industrial refrigeration systems.

In contrast, the other options listed (R22, R134a, and R410A) are types of refrigerants with different chemical compositions and applications. R22 is a chlorodifluoromethane that has been phased out in many applications due to environmental concerns. R134a is a hydrofluorocarbon used primarily in domestic refrigerators and automotive applications. R410A is a blend of hydrofluorocarbons that is commonly employed in air conditioning systems. Understanding the designation of R717 helps technicians and engineers choose the appropriate refrigerant based on its properties and compatibility with existing systems.