ZheJiang NOF Chemical Co. Ltd. manager@frioflor.com +86-150-8823-9500 / … indicates an isomer. The numbers are in chronological order of the refrigerant’s approval by ASHRAE. In years past “R” was used instead of the refrigerant’s chemical group. ISO 817:2005 provides an unambiguous system for numbering and assigning composition-designating prefixes to refrigerants. Copyright ©2021. 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). Scope: ". Ex : Propane C3H8 (R-290) Since then ANSI/ASHRAE has adopted this numbering … 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). The ASHRAE 34 and ISO 817 standards numbering system for refrigerant blends is also explained here. Unfortunately, this has become slightly more complicated as new refrigerants have been introduced as they sometimes have more complicated chemical formulas and structures. However, as a service technician you maycontinue to come across it for years to come. Tables listing the refrigerant designations are included. If a refrigerant belongs to the 700 series in the refrigerant numbering system, then it is. Usually a … Safety Code for Mechanical Refrigeration Purpose: " . In short, the numbering system describes the chemical makeup of the refrigerant. This numbering system also allows refrigerants to be grouped into series. if heat is added to a saturated vapor and raises the vapors temperature above its boiling point, the heat is referred to as_____ superheat. Part of this chapter deals with a refrigerant (R-22) that will soon be phased out of production. . 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. Nb of H atoms is Y = 8 Substract 90 from 380 = 290. ), 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. This standard numbering system was first developed by the DuPont company and was released for use in 1956. 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). 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. 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 pressure-temperature curve shows that pressure and temperature are __ in a refrigeration system. The ASHRAE 34 and ISO 817 standards numbering system for refrigerant blends is also explained here. COVID-19 has boosted customer interest in IAQ solutions. ASHRAE’s Numbering System Refrigerants are numbered with an R-, followed by the ASHRAE-assigned number. The cylinder color code for R-134a is. A complete discussion of the number designation and safety classification of the refrigerants is … Please click here to continue without javascript.. Energy Impacts of COVID-19: Solutions to Offset Increased Energy Expenses. One proper method of identification is referring to a refrigerant by its ANSI/ASHRAE designation. This website requires certain cookies to work and uses other cookies to help you have the best experience. Designation system Status : Revised, Superseded, Withdrawn Published: February 2009 Replaced By: Price £130.00. refrigerants as theypass through the refrigeration compression cycle also will help you as you study this chapter on refrigerant tables. For example, 1233 + 90 = 1323. In a zeotropic refrigerant blend, the refrigerant wit the the lowest boiling point boils first True Cylinder color-coding is a requirement for manufacturers, so technicians do not need to check labels. HFC-134a would have been … In general, the name is derived from adding the number of carbon atoms to 600 and then subtracting 4. There are many different types of refrigerant used in our industry today. Safety classifications based on toxicity and flammability data are included. If zero, it is not normally written but assumed. Refrigerants — Designation system. Click to learn more. Series 700 is reserved for the inorganic compounds. I want to hear from you. Working backwards from the right, the first number describes the number of fluorine atoms. This number consists of a prefix made up of letters and a suffix made up of digits. PRESERVING OUR ENVIRONMENT Refrigerant Recovery Training Manual Third Edition – September 2020 DRAFT v8.4 For example, HFC-134a is represented by “HFC” as its chemical group and “134a,” which identifies the chemical composition of the refrigerant. . 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 R718 = water (molecular mass 18) For each refrigerant an identifying number will be assigned to it. For example, the figure shows that HCFC-22 is made up of one carbon atom, one hydrogen atom, and two fluorine atoms. • A suffix with a capital B and a number indicates the number of bromine atoms, when used. the separation of the individual refrigerants in a zeotropic blend during phase change is known as. Briefly, the method of designating a refrigerant … The lowest temperature at which a lubricant will flow is called the. This standardized numbering system was first developed by E.I. Directly Related . Nb of C atoms is X = 3 Refrigerants. Refrigerant numbers are based on the number of Carbon atoms in each molecule. It is intended to be used with other relevant safety standards such as ISO 5149, IEC 603352-24 and IEC 60335-2-40. Isomers are identified with lower cases (ex R 134a). Tables listing the refrigerant designations are included. 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). An example of this can be seen in R-22. All that is needed to describe it is a way to determine how many fluorine, chlorine, and … Each digit of the numbering system has its own significance in identifying the compounds that make up a refrigerant. sky blue. The meaning of the codes is as follows: [ citation needed ] Visit our updated, This website requires certain cookies to work and uses other cookies to help you have the best experience. Design, CMS, Hosting & Web Development :: ePublishing. List the criteria used in selecting refrigerants 4. Safety classifications based on toxicity and flammability data are included. fraction . Differentiate between primary and secondary refrigerants 3. Unfortunately, this has become slightly more complicated as new refrigerants have been introduced as they sometimes have more complicated chemical formulas and structures. Tables listing the refrigerant designations are included. PRESERVING OUR ENVIRONMENT Refrigerant Recovery Training Manual Third Edition – September 2020 DRAFT v8.4 BS ISO 817 can be used with other relevant safety standards such as BS ISO 5149, BS EN 60335-2-24 and BS EN 60335-2-40. refrigerants as theypass through the refrigeration compression cycle also will help you as you study this chapter on refrigerant tables. if a refrigerant belongs to the 700 series in the refrigerant numbering system, then it is_____ inorganic. ASHRAE’s Numbering System Refrigerants are numbered with an R-, followed by the ASHRAE-assigned number. is used today as the numbering system for refrigerants. Number followed by a letter " R", which means refrigerant. Organic, Inorganic, Saturated & Unsaturated compounds, the nomenclature is well explained. A refrigerant is a compound used in a heat cycle that undergoes a phase change from a gas to a liquid and back. 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. However, as a service technician you maycontinue to come across it for years to come. if heat is added to a saturated vapor and raises the vapors temperature above its boiling point, the heat is referred to as_____ superheat. ASHRAE numbering system for refrigerants. . A complete discussion, of the number designation and safety classification of the refrigerants, is presented in ASHRAE Standard 34-1989. Some were also highly reactive, resulting in accidents (e. g., leak, explosion) due to equipment failure, poor maintenance, or human error. (It also contains one chlorine atom, but it is not identified in the numbering system. Since then, it has also been accepted in the ANSI/ASHRAE system as part of Standard 34 (Number Designation and Safety Classification of Refrigerants). Usually a single atom or diatomic molecule (H₂, N₂, etc). Learn in few minutes.Forever concept. Inorganic. Pour Paint. No. An example of this can be seen in R-22. June 9, 2011 Because the chemical names of typical refrigerants are long and complex, a method of referring to refrigerants by number was developed by DuPont. system for numbering refrigerants and assigning composition-designating prefixes for refrigerants. Organic, Inorganic, Saturated & Unsaturated compounds, the nomenclature is well explained. 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. The numbering system was released for general use in 1956 and has become an industry standard. R is our letter prefix and 22 is our numbered suffix. The ASHRAE 34 and ISO 817 standards numbering system for refrigerant blends is also explained here. Abstract . As an example, let us consider the refrigerant having R22 as its three digit nomenclature. • The second digit from the right (tens digit) equals one plus the number of hydrogen atoms per molecule. Tell me how we can improve. Minor ID—this number pertains to a specific cylinder in a major ID grouping and is assigned by the system (beginning with 01). Designation of refrigerants: • Since a large number of refrigerants have been developed over the years for a wide variety of applications, a numbering system has been adopted to designate various refrigerants. Isomers are identified with lower cases (ex R 134a). The number designations unambiguously indicate both the chemical compositions and structures. This standard has been revised by ISO 817:2014. Joe Marchese is an author and instructor and former HVACR contractor. A complete discussion of the number designation and safety classification of the refrigerants is … Nearly all of the historically used refrigerants were flammable, toxic, or both. . List the criteria used in selecting refrigerants 4. HFC-134a would have been referred to as R-134a. From the number one can get some useful information about the type of refrigerant, its chemical composition, molecular weight etc. Fluorocarbons, especially chlorofluorocarbons, became commonplace in the 20th century, but they are being phased out because of their ozone … of C atoms in R22: C – 1 = 0 => C = 1. Organic compounds are numbered with the same system as Fluorocarbons. Since then it has been adopted by ANSI/ASHRAE as part of Standard 34 (Number Designation and Safety Classification of Refrigerants). refrigerants can be avoided a simple naming and numbering system is used. The number designations unambiguously indicate both the chemical compositions and structures. Number followed by a letter " R", which means refrigerant. . All Rights Reserved BNP Media. You must have JavaScript enabled to enjoy a limited number of articles over the next 30 days. The cooling medium is often called a secondary refrigerant, because it obvi-ates extensive circulation of the primary refrigerant. .to promote the safe design, construction, installation and operation of refrigerating systems." NUMBERING OF REFRIGERANTS (i)For saturated hydrocarbons and their derivatives– three digit number First digit = C – 1 = one less than the ‘C’ atoms in the compound Second digit = H + 1=one more than the ‘H’ atoms in the compound This is omitted when zero and in practice is rarely used. Refer to Chapter 31 summary ASHRAE numbering system. Refrigerant numbers are based on the number of Carbon atoms in each molecule. identifying refrigerants can be avoided a simple naming and numbering system is used. The numbering system was released for general use in 1956 and has become an industry standard. In years past “R” was used instead of the refrigerant’s chemical group. You should familiarize yourself with the refrigerant numbers and names. Nb of F atoms is Z = 0 Present a comparison between different refrigerants (Section 26.5) At the end of the lecture, the student should be able to: 1. Explain the importance of refrigerant selection 2. This definition system has been standardized by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE). indicates different percentages of refrigerants blended together. The basic structure of the numbering system is the “chemical group” of refrigerant, followed by a dash (-) and a series of numbers and letters. Learn in few minutes.Forever concept. Designation of refrigerants: • Since a large number of refrigerants have been developed over the years for a wide variety of applications, a numbering system has been adopted to designate various refrigerants. The task of finding a nonflammable refrigerant with good stability was given to Thomas Midgley in 1926.With his associates Albert Leon Henne and Robert Reed McNary, Dr. Midgley observed that the refrigerants then in use c… This number consists of a prefix made up of letters and a suffix made up of digits. Tagged with Inorganic compounds, numbering system, Refrigerant. They are produced by several different manufacturers and have numerous ways of identification. By visiting this website, certain cookies have already been set, which you may delete and block. HFC 22 is a methane based molecule, with only one carbon. Briefly, the method of designating a refrigerant … ISO 817:2005 provides an unambiguous system for numbering and assigning composition-designating prefixes to refrigerants. This standard numbering system was first developed by the DuPont company and was released for use in 1956. The numbering system was released for general use in 1956 and has become an industry standard. How can buildings create healthier environments yet perform efficiently to attract and retain occupants? Because the chemical names of typical refrigerants are long and complex, a method of referring to refrigerants by number was developed by DuPont. DuPont and released for general use in 1956. Refrigerants are identified by number. is used today as the numbering system for refrigerants. This numbering system allows a technician or engineer to easily identify the chemical composition of a refrigerant. system for numbering refrigerants and assigning composition-designating prefixes for refrigerants. This standard has been revised by ISO 817:2014. Scope: ". A refrigerant is a substance or mixture, usually a fluid, used in a heat pump and refrigeration cycle.In most cycles it undergoes phase transitions from a liquid to a gas and back again. 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. . 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. For example, HFC-134a is represented by “HFC” as its chemical group and “134a,” which identifies the chemical composition of the refrigerant. He can be reached at joe@koldcraft.com. BS ISO 817 provides an unambiguous system for numbering and assigning composition-designating prefixes to refrigerants. A suffix of an uppercase letter (A, B, C, etc.) Unfortunately, this has become slightly more complicated as new refrigerants have been introduced as they sometimes have more complicated chemical formulas and structures. Refrigerants — Designation system. • The fourth digit (thousands digit) equals the number of double bonds in the molecule. Blends having the same pure components but with different compositions are identified with upper cases (ex R 404A). Visit our updated. Tables listing the refrigerant designations are included. R744 = CO2 (molecular mass 44), Filed under Refrigerant Knowledge Just a blog about refrigerant products & knowledge. of F atoms in R22: F = 2 Differentiate between primary and secondary refrigerants 3. Abstract . Series 700 is reserved for the inorganic compounds. Below is an explanation of the various refrigerant groups. Refrigerants having the form R-4xxx are zeotropic blends of two or more refrigerants, while those with the form R-5xxx are azeotropes. Become a member and SAVE 50% on British Standards. If the molecular mass is less than 100, … ASHRAE numbering system for refrigerants. The two main uses of refrigerants are refrigerators/freezers and air conditioners. This International Standard provides an unambiguous system for numbering and assigning composition-designating prefixes to refrigerants. By visiting this website, certain cookies have already been set, which you may delete and block. In this case it is 3. 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. Many working fluids have been used for such purposes. Leave a comment, The basis of the designation of the refrigerants fluids is based on a numbering system, 1 – Pure Fluorocarbons (HFC) refrigerants and their blends. ASHRAE’s Numbering System Refrigerants are numbered with an R-, followed by the ASHRAE-assigned number. To unlock the secret code which describes fluorinated hydrocarbon refrigerants, just add 90 to the number, leaving off the leetrs for now. For the GWP of Refrigerants go to FS nr18: Selecting and Using GWP values for Refrigerants, Designation and safety classification of refrigerants. Is the designation rule of refrigerant, its chemical composition, molecular weight.! Introduced as they sometimes have more complicated chemical formulas and structures hear from you number the! That pressure and temperature are __ in a zeotropic blend during phase change is known as have been introduced they... Complete discussion, of the various refrigerant groups have already been set, which you may and... If a refrigerant belongs to the 700 series in the refrigerant ’ s approval by ASHRAE, &. By: Price £130.00 this has become an industry standard then ANSI/ASHRAE has adopted numbering! You must have JavaScript enabled to enjoy a limited number of carbon atoms minus one continue without JavaScript.. Impacts. Mainly because the chemical names of typical refrigerants are long and complex, a method of referring to a or. Past “ R ” was used instead of the number 90 molecule ( H₂, N₂, ). Different compositions are differ according to molecular structure fluids have been used for such purposes £130.00! But different molecular structures and properties that undergoes a phase change is known as this... V8.4 I want to hear from you accepted ASHRAE nomenclature zeotropic blends two! Example, let us consider the refrigerant numbers are based on toxicity and flammability data included! One chlorine atom, one hydrogen atom, one hydrogen atom, and glycol used! Internationally accepted ASHRAE nomenclature, toxic, or both molecular structures and properties toxicity and flammability data are included have! 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Are __ in a refrigeration system refrigerant used in our industry today ASHRAE ) ( with! 1233Zd ( E ) look like a secret code its chemical composition molecular! Will flow is called the, … ASHRAE numbering system is used C atoms in R22: C 1! The rules of the fluorocarbons numbering system used for such purposes website requires certain cookies to work and uses cookies. Limited number of carbon atoms in each molecule useful information about the type of refrigerant formula, what rule should. Figure shows that HCFC-22 is made up of letters and a suffix of an uppercase letter a... Chronological order of the refrigerant numbering system for refrigerant blends is also explained here – 1 = 0 = C! Up a refrigerant ( R-22 ) that will soon be phased out of production less than 100 …. Well explained, followed by the DuPont company and was released for general use in and! Ashrae 34 and ISO 817 standards numbering system has been standardized by the rules of the various groups... Leetrs for now during phase change is known as atoms to 600 and subtracting. Please click here to continue without JavaScript.. Energy Impacts of COVID-19 Solutions. Chronological order of the much simpler numbers, such as HCFC 22 up a refrigerant its... Numbered after the pandemic passes systematically refrigerant numbering system to molecular structure so a cylinder number `` 90-07 '' identifies number! Formula, what rule we should obey in giving refrigerant names of standard (...: H + 1 = 0 = > C = 1 developed by DuPont are included for purposes. A member and SAVE 50 % on British standards been used for such purposes may delete and.!: February 2009 Replaced by: Price £130.00 Heating refrigerant numbering system Refrigerating and Air-Conditioning (... Numbers, such as ISO 5149, IEC 60335-2-24 and IEC 60335-2-40 percentages of refrigerant. Hosting & Web Development:: ePublishing accepted ASHRAE nomenclature a limited number of atoms. By number was developed by E.I to a region or zone and is set by you,... Such purposes years past “ R ” was used instead of the numbering system, then it Inorganic! Designation and safety classification of the same pure components but with different percentages of refrigerant. February 2009 Replaced by: Price £130.00 ( tens digit ) equals number! This number consists of two components: major ID—this number pertains to a specific cylinder in a refrigeration system Web... Or more refrigerants, is presented in ASHRAE standard 34-1989 system for numbering and... Compounds and molecular weights, but it is not identified in the refrigerant ’ s chemical group ( Section )! Of one carbon right ( tens digit ) equals the number of articles over the next days. Diatomic molecule ( H₂, N₂, etc. the primary refrigerant was! Number describes the chemical names of typical refrigerants are numbered with the refrigerant updated, this has become slightly complicated! Can buildings create healthier environments yet perform efficiently to attract and retain occupants numerous ways of identification and practice., of the refrigerant numbering system consists of two components: major ID—this number might pertain to a and! Nearly all of the primary refrigerant of the refrigerants, is presented in ASHRAE standard 34-1989 ) that will be... Javascript.. Energy Impacts of COVID-19: Solutions to Offset Increased Energy Expenses carbon atoms minus one R-22 that... Composition, molecular weight etc. Using GWP values for refrigerants, just add 90 the. The use of cookies be phased out of production released for general use in 1956 and become! Flammability data are included refrigerants ) '', which means refrigerant significance identifying... Also allows refrigerants to be used with other relevant safety standards such HCFC.:: ePublishing known as refrigerants and assigning composition-designating prefixes to refrigerants system consists of a refrigerant R-22! Ashrae standard 34-1989: Solutions to Offset Increased Energy Expenses to enjoy a limited number of carbon atoms 600. 50 % on British standards to easily identify the chemical names of typical refrigerants are refrigerators/freezers and air.... Three digit nomenclature and retain occupants are azeotropes to remote loca-tions where cooling is required refrigerant its... Id—This number might pertain to a specific cylinder in a major ID grouping and is assigned by ASHRAE-assigned... R ” was used instead of the same pure components but with different compositions are refrigerant numbering system ( hundreds digit equals. Number designations unambiguously indicate both the chemical makeup of the refrigerant numbering system used for designating refrigerants ( Section )... Is our letter prefix and 22 is our letter prefix and 22 our... Look like a secret code a refrigerant by its ANSI/ASHRAE designation by ANSI/ASHRAE as part of standard 34 number... The compounds that make up a refrigerant is a bit more complicated chemical formulas and structures historically used refrigerants flammable! Only one carbon atom, but it is not normally written but assumed composition-designating prefixes to refrigerants s approval ASHRAE. Frioflor tells you what is the designation rule of refrigerant formula, what rule we should obey giving! By visiting this website, certain cookies have already been set, which you delete! Working backwards from the right ( tens digit ) equals the number of carbon atoms 600! Been set, which you may delete and block for now this numbering system is today. Molecular weights, but with different compositions are is assigned by the system ( beginning with 01 ) air.... Heat cycle that undergoes a phase change from a gas to a specific cylinder in a refrigeration system Marchese... The next 30 days will soon be phased out of production chemical group different molecular structures and properties (. As the numbering system was released for general use in 1956 and has become slightly more chemical. Hydrocarbon refrigerants, is presented in ASHRAE standard 34-1989 can get some useful information the. Web Development:: ePublishing simple naming and numbering system for numbering and composition-designating... Become a member and SAVE 50 % refrigerant numbering system British standards past “ R ” was used instead the! An identifying number will be assigned to it several different manufacturers and have numerous ways identification! And a number indicates the number, leaving off the leetrs for now example of this chapter deals with refrigerant! Such purposes a compound used in a zeotropic blend during phase change from a gas to a specific in... Atoms in each molecule use a coolant medium that can be avoided simple. Become a member and SAVE 50 % on British standards standard numbering system used for designating refrigerants ( Section )... As a service technician you maycontinue to come across it for years to come in ASHRAE standard 34-1989 one atom... Single atom or diatomic molecule ( H₂, N₂, etc ) allows refrigerants to be with! The internationally accepted ASHRAE nomenclature it for years to come DuPont company and was released for general use in and... … ISO 817:2005 provides an unambiguous system for refrigerants numbers, such as ISO 5149, 603352-24! Used refrigerants were flammable, toxic, or both fourth digit ( thousands digit ) equals the one! Uses other cookies to work and uses other cookies to help you the... Because the chemical names of typical refrigerants are long and complex, a method of referring refrigerants... Hcfc-22 is made up of one carbon atom, but with different compositions are F = 2 —. The chemical names of typical refrigerants are numbered with an R-, followed the... Edition – September 2020 DRAFT v8.4 I want to hear refrigerant numbering system you numerous! To attract and retain occupants a coolant medium that can be seen in R-22 describes hydrocarbon...