Nomenclature of refrigerants pdf file

According to an international agreement, refrigerants are represented by the letter r as in refrigerants followed by a two or threedigit number and, in some cases, one or two letters. Thus, we have separate series for halogenated refrigerants and other types. 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. Pdf refrigerant types, issues, trends and future options. Th movement cooling by the removal of heat the movement of heat from a place where it is.

Ansiashrae standard 34, designation and safety classification of refrigerants. Class 2 refrigerants are used as direct cooling between the agents of class 1 and substances in the refrigerator. 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. Ansiashrae standard 3420, designation and safety classification of. Pdf seminar is focused on the fundamentals of vapor compression refrigeration. The summary of key physical, safety and environmental data for common refrigerants and leading candidates is presented. Further information can be found in the latest version of standard 34, available. Refrigerant history and nomenclature part 2 forward. Class 1 refrigerants used in the standard compression type cooling system.

Refrigerants are classified by ashrae, and their friends r numbers are assigned in accordance with certain rules. Update maintenance documents every time the system is serviced, to record. For example, the classification of halogen refrigerants derived from saturated. The designation rxyz is determined by the chemical composition of the molecule, as described below. 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. What links here related changes upload file special pages permanent link page information wikidata item cite this page. Refrigerant types, issues, trends and future options. These naming conventions differ according to the type of refrigerant. 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.

Compressor basic refrigeration cycle evaporator condenser receiver expansion device. To develop the nomenclature for common refrigerants, ashrae developed standard 34, designation and safety classification of refrigerants. Pdf hydrocarbons as alternative refrigerants in domestic. Each refrigerant type is denoted by a different series.

Reclaimed refrigerant certification program includes purity specifications for. Ashrae standard designation and safety classification of. Ashrae position document on natural refrigerants pdf epa. 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. For example, classification of refrigerants derivatives of hydrocarbons, saturated and consisting of one substance only shown in the example below. The tables contained on this page list approved refrigerant numbers from standard 34, which describes a shorthand way of naming refrigerants and assigns. 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 3 refrigerants used in the standard absorption systems of refrigeration systems.