You should familiarize yourself with the refrigerant numbers and names. The basic structure of the numbering system is the “chemical group” of refrigerant, followed by a dash (-) and a series of numbers and letters. Examples:          R717 = ammonia (molecular mass 17) Refrigerants. Isomers are identified with lower cases (ex R 134a). . They are produced by several different manufacturers and have numerous ways of identification. These are numbers according to their molecular mass. All that is needed to describe it is a way to determine how many fluorine, chlorine, and … The number designations unambiguously indicate both the chemical compositions and structures. For example, HFC-134a is represented by “HFC” as its chemical group and “134a,” which identifies the chemical composition of the refrigerant. From the number one can get some useful information about the type of refrigerant, its chemical composition, molecular weight etc. .to promote the safe design, construction, installation and operation of refrigerating systems." Since then, it has also been accepted in the ANSI/ASHRAE system as part of Standard 34 (Number Designation and Safety Classification of Refrigerants). The meaning of the codes is as follows:[citation needed] The R-# numbering system was developed by DuPontcorporation (which owns the Freontrademark) and systematically identifies the molecular structure of refrigerants made with a single halogenated hydrocarbon. The ASHRAE 34 and ISO 817 standards numbering system for refrigerant blends is also explained here. List the criteria used in selecting refrigerants 4. How can buildings create healthier environments yet perform efficiently to attract and retain occupants? Isomers (molecule with the same chemical formula as another molecule but with a different chemical structure) are identified with a lower case letter after the number (for example, R-134a). However, as a service technician you maycontinue to come across it for years to come. Nearly all of the historically used refrigerants were flammable, toxic, or both. Refrigerant numbers are based on the number of Carbon atoms in each molecule. indicates different percentages of refrigerants blended together. Joe Marchese is an author and instructor and former HVACR contractor. A pressure-temperature curve shows that pressure and temperature are __ in a refrigeration system. Follow via messages; Follow via email; Do not follow; written 22 months ago by CRAIG D'SOUZA • 40: Follow via messages ; Follow via email; Do not follow; The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) has developed certain conventions for use in naming different types of refrigerants. Refrigerants are identified by number. Abstract . Tagged with Inorganic compounds, numbering system, Refrigerant. Working backwards from the right, the first number describes the number of fluorine atoms. If zero, it is not normally written but assumed. A complete discussion, of the number designation and safety classification of the refrigerants, is presented in ASHRAE Standard 34-1989. The numbering system for both classes of compounds is the same (except for a slightly different numbering system used to describe the Halons and also the prefix before each number, which is simply CFC- or HCFC-, depending on the class to which that particular compound belongs). Substract 90 from 380 = 290. R718 = water (molecular mass 18) Member Price £65.00. PRESERVING OUR ENVIRONMENT Refrigerant Recovery Training Manual Third Edition – September 2020 DRAFT v8.4 Part of this chapter deals with a refrigerant (R-22) that will soon be phased out of production. Please Explain the Refrigerant Numbering System. The lowest temperature at which a lubricant will flow is called the. The ASHRAE 34 and ISO 817 standards numbering system for refrigerant blends is also explained here. ASHRAE’s Numbering System Refrigerants are numbered with an R-, followed by the ASHRAE-assigned number. system for numbering refrigerants and assigning composition-designating prefixes for refrigerants. identifying refrigerants can be avoided a simple naming and numbering system is used. By visiting this website, certain cookies have already been set, which you may delete and block. Usually a single atom or diatomic molecule (H₂, N₂, etc). Isomers are identified with lower cases (ex R 134a). The numbering of refrigerants is based on the original numbering system for fluorocarbons, which was developed in the 1930s by DuPont and adopted by the entire field in 1956. Tell me how we can improve. This definition system has been standardized by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE). • The third digit from the right (hundreds digit) equals the number of carbon atoms minus one. Part of this chapter deals with a refrigerant (R-22) that will soon be phased out of production. COVID-19 has boosted customer interest in IAQ solutions. ISO 817:2005 provides an unambiguous system for numbering and assigning composition-designating prefixes to refrigerants. system, it is often more economical to use a coolant medium that can be pumped to remote loca-tions where cooling is required. Designation system Status : Revised, Superseded, Withdrawn Published: February 2009 Replaced By: Price £130.00. Copyright ©2021. According to the above mentioned convention, No. These naming conventions differ according to the type of refrigerant. Unfortunately, this has become slightly more complicated as new refrigerants have been introduced as they sometimes have more complicated chemical formulas and structures. Within three days of starting, Midgley and his collaborators had identified and synthesized dichlorodifluoromethane, now known as R-12.4 The first toxicity test was performed by exposing a guinea pig to the new com- pound. Ex : Propane C3H8 (R-290) This number consists of a prefix made up of letters and a suffix made up of digits. The numbering system was released for general use in 1956 and has become an industry standard. ASHRAE’s Numbering System Refrigerants are numbered with an R-, followed by the ASHRAE-assigned number. ISO 817:2005 provides an unambiguous system for numbering and assigning composition-designating prefixes to refrigerants. Isomers (molecule with the same chemical formula as another molecule but with a different chemical structure) are identified with a lower case letter after the number (for example, R-134a). Refrigerant numbers are based on the number of Carbon atoms in each molecule. Abstract . All Rights Reserved BNP Media. The R-# numbering system was developed by DuPont (which owned the Freon trademark), and systematically identifies the molecular structure of refrigerants made with a single halogenated hydrocarbon. coolant. ASHRAE’s Numbering System Refrigerants are numbered with an R-, followed by the ASHRAE-assigned number. You should familiarize yourself with the refrigerant numbers and names. Tables listing the refrigerant designations are included. Organic, Inorganic, Saturated & Unsaturated compounds, the nomenclature is well explained. . This numbering system allows a technician or engineer to easily identify the chemical composition of a refrigerant. A complete discussion, of the number designation and safety classification of the refrigerants, is presented in ASHRAE Standard 34-1989. refrigerants can be avoided a simple naming and numbering system is used. A complete discussion of the number designation and safety classification of the refrigerants is … HFC refrigerant blends (i.e. The numbering system consists of two components: Major ID—this number might pertain to a region or zone and is set by you. The numbering system was released for general use in 1956 and has become an industry standard. ASHRAE’s Numbering System Refrigerants are numbered with an R-, followed by the ASHRAE-assigned number. The numbers are in chronological order of the refrigerant’s approval by ASHRAE. Each digit of the numbering system has its own significance in identifying the compounds that make up a refrigerant. Assigned to it unambiguously indicate both the chemical compositions and structures water, brine, glycol! 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