What links here related changes upload file special pages permanent link page information wikidata item cite this page. Refrigerant history and nomenclature part 2 forward. Further information can be found in the latest version of standard 34, available. All terms in this document will follow the standard industry definitions in the. Thus, we have separate series for halogenated refrigerants and other types.
The tables contained on this page list approved refrigerant numbers from standard 34, which describes a shorthand way of naming refrigerants and assigns. Pdf seminar is focused on the fundamentals of vapor compression refrigeration. Chemical refrigerants are assigned an r number which is determined systematically according. Possibilities of changeover from cfchcfc based refrigerants to hfc or hfo based third and. Class 2 refrigerants are used as direct cooling between the agents of class 1 and substances in the refrigerator. Ansiashrae standard 34, designation and safety classification of refrigerants. You should be consistent and descriptive in naming and organizing files so that it is obvious where to find specific data and what the files contain. For example, the classification of halogen refrigerants derived from saturated. Ansiashrae standard 3420, designation and safety classification of. The letters e or z are appended at the end of the refrigerant number to show the precedence of the atoms or groups which are attached to the carbon atoms at either end of the double bond. To develop the nomenclature for common refrigerants, ashrae developed standard 34, designation and safety classification of refrigerants. Refrigerant types, issues, trends and future options. Update maintenance documents every time the system is serviced, to record.
The summary of key physical, safety and environmental data for common refrigerants and leading candidates is presented. Working fluids in refrigeration cycles undergoes phase transition in cycles mostly before going to subject topic first of all we divide all refrigerants in following categories. Now that you know a little more about the history and general types of refrigerants i recommend you read part 1 if you havent already its time to get to the really interesting part, refrigerant nomenclature or naming convention. The tables contained on this page list approved refrigerant numbers from ansiashrae 342019, designation and safety classification of refrigerants, the latest edition of standard 34, which describes a shorthand way of naming refrigerants and assigns safety classifications based on toxicity and flammability data. Ashrae standard designation and safety classification of. Refrigerants are classified by ashrae, and their friends r numbers are assigned in accordance with certain rules. New, natural and alternative refrigerants by dr s f pearson of star refrigeration limited introduction it is an honour to be invited to present this paper despite the rather daunting title. These naming conventions differ according to the type of refrigerant. The designation rxyz is determined by the chemical composition of the molecule, as described below. Reclaimed refrigerant certification program includes purity specifications for. Best practices for file naming menu how you organize and name your files will have a big impact on your ability to find those files later and to understand what they contain.
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