Manual for Refrigeration Servicing Technicians - UNEP - Division of ...

2
Refrigerants
2.1. Section objectives
This chapter provides a broad overview of most of the issues
associated with refrigerants. This includes the criteria normally
applied to their selection (for example, thermodynamic
properties and safety characteristics), an overview of the
various types of refrigerants and how they are identified.
Particular attention is paid to the characteristics of refrigerant
blends. Although not normally considered to be a refrigerant,
the topic of refrigeration oils or lubricants is discussed since
it effectively becomes part of the working fluid during system
operation and thus requires special attention also.
The information provided here should help the reader
to be able to:
• Identify refrigerant characteristics
• Recognise the classification of refrigerants
• State the main refrigerant groups
• Identify the proper refrigerant for each refrigeration or
air-conditioning system
• State the main characteristics for the most commonlyused
refrigerant
• Identify the suitable lubricant for each refrigerant.