Nearly all of the historically used refrigerants were flammable, toxic, or both. Tables listing the refrigerant designations are included. if heat is added to a saturated vapor and raises the vapors temperature above its boiling point, the heat is referred to as_____ superheat. The basis of the designation of the refrigerant s fluids is based on a numbering system 1 – Pure Fluorocarbons (HFC) refrigerants and their blends The refrigerants are numbered with an R-, followed by the HFC-number, given by the rules of the fluorocarbons numbering system. In general, the name is derived from adding the number of carbon atoms to 600 and then subtracting 4. ASHRAE numbering system for refrigerants. The table is sortable by each of the following refrigerant properties (scroll right or reduce magnification to view more properties): Type/Prefix (see legends) ASHRAE number; IUPAC chemical name; molecular formula; CAS registry number / Blend Name identifying refrigerants can be avoided a simple naming and numbering system is used. For example, the figure shows that HCFC-22 is made up of one carbon atom, one hydrogen atom, and two fluorine atoms. This definition system has been standardized by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE). All that is needed to describe it is a way to determine how many fluorine, chlorine, and … For each refrigerant an identifying number will be assigned to it. Cf. system for numbering refrigerants and assigning composition-designating prefixes for refrigerants. The meaning of the codes is as follows:[citation needed] • The fourth digit (thousands digit) equals the number of double bonds in the molecule. In this case it is 3. Refrigerants. ASHRAE Refrigerant Designations. This standard numbering system was first developed by the DuPont company and was released for use in 1956. Pour Paint. Refrigerant numbers are based on the number of Carbon atoms in each molecule. This International Standard provides an unambiguous system for numbering and assigning composition-designating prefixes to refrigerants. Examples:          R717 = ammonia (molecular mass 17) R744 = CO2 (molecular mass 44), Filed under Refrigerant Knowledge A complete discussion of the number designation and safety classification of the refrigerants is … The ASHRAE 34 and ISO 817 standards numbering system for refrigerant blends is also explained here. 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). The basis of the designation of the refrigerant s fluids is based on a numbering system 1 – Pure Fluorocarbons (HFC) refrigerants and their blends The refrigerants are numbered with an R-, followed by the HFC-number, given by the rules of the fluorocarbons numbering system. For example R-402A and R-402B are made up of the same refrigerants, but with different percentages of each refrigerant. Because the chemical names of typical refrigerants are long and complex, a method of referring to refrigerants by number was developed by DuPont. Visit our updated, This website requires certain cookies to work and uses other cookies to help you have the best experience. Present a comparison between different refrigerants (Section 26.5) At the end of the lecture, the student should be able to: 1. This definition system has been standardized by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE). Click to learn more. Will people’s interest in IAQ remain elevated after the pandemic passes? In general, the name is derived from adding the number of carbon atoms to 600 and then subtracting 4. PRESERVING OUR ENVIRONMENT Refrigerant Recovery Training Manual Third Edition – September 2020 DRAFT v8.4 ASHRAE’s Numbering System Refrigerants are numbered with an R-, followed by the ASHRAE-assigned number. Unfortunately, this has become slightly more complicated as new refrigerants have been introduced as they sometimes have more complicated chemical formulas and structures. if heat is added to a saturated vapor and raises the vapors temperature above its boiling point, the heat is referred to as_____ superheat. But that is also true of the much simpler numbers, such as HCFC 22. Series 700 is reserved for the inorganic compounds. The basis of the designation of the refrigerant s fluids is based on a numbering system 1 – Pure Fluorocarbons (HFC) refrigerants and their blends The refrigerants are numbered with an R-, followed by the HFC-number, given by the rules of the fluorocarbons numbering system. • A suffix with a capital B and a number indicates the number of bromine atoms, when used. Unfortunately, this has become slightly more complicated as new refrigerants have been introduced as they sometimes have more complicated chemical formulas and structures. Become a member and SAVE 50% on British Standards. In short, the numbering system describes the chemical makeup of the refrigerant. Inorganic compounds shall be assigned a number in the 700 series, identification numbers are formed by adding the relative molecular mass of components to 700. Some were also highly reactive, resulting in accidents (e. g., leak, explosion) due to equipment failure, poor maintenance, or human error. Each refrigerant type is denoted by a different series. Differentiate between primary and secondary refrigerants 3. He can be reached at joe@koldcraft.com. The tables contained on this page list approved refrigerant numbers from ANSI/ASHRAE 34-2019, 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. DuPont and released for general use in 1956. For example HCFC-22 has one carbon atom. This standard has been revised by ISO 817:2014. R for refrigerant. Learn in few minutes.Forever concept. HFC-134a would have been … ), Temperature and Humidity Play a Critical Role in Preserving Floral Arrangements, Take the Time to Thoroughly Inspect Compressors, War Stories of a Refrigeration Technician, Where To Install the Liquid Line Sight Glass, Ice Breaker: Evaporator Superheat Explained, Ice Breaker: Recording Refrigerant Usage; Observing Regulations, Ice Breaker: How to Select the Right Refrigerant. Number followed by a letter " R", which means refrigerant. is used today as the numbering system for refrigerants. So a cylinder number "90-07" identifies cylinder number 7 in the region identified by the number 90. Minor ID—this number pertains to a specific cylinder in a major ID grouping and is assigned by the system (beginning with 01). R is our letter prefix and 22 is our numbered suffix. 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