Various ways of substituting the atom or group on the carbons can exist and this is denoted by two lowercase letters see figure 3. Designation and nomenclature information june 27th, 2016 disclaimer. A comparison between refrigerants used in air conditioning derya ozkan, ozden agra and ozlem cetin university of yildiz technical university, turkey corresponding email. Nomenclature of refrigerants or designation of a refrigerant. Chemical refrigerants are assigned an r number which is determined systematically according. While such nomenclature is intended to distinguish specific attributes, nonuniform usage may.
Call your local branch for availability removing the mystery from model numbers tecumsehs compressor and condensing unit model numbering system is a combination of significant numbers and letters, which condense a great deal of information into a small space. The refrigerants have a thermodynamic property charge. Until recently, refrigerants were referred to by standardized designations or trade names. To enable the use of smaller compressors and other equipment the refrigerant should have smaller vapor density. Mar 26, 2020 nomenclature of refrigerants or designation of a refrigerant refrigeration and air conditioning mechanical engineering notes edurev is made by best teachers of mechanical engineering. For example, the classification of halogen refrigerants derived from saturated hydrocarbons and consisting of only one substance is illustrated in fig. Hcfc and hfo nomenclature basic principles cfcs, hcfcs, hfcs, hcs and pfcs in the identification of fluorocarbons, use is made of prefixes and sets of numbers andor letters. Oxygen and nitrogen compounds refrigerants having either oxygen or nitrogen molecules in their structure, such as ammonia, are grouped separately and have a separate nomenclature from the halogenated refrigerants. Mseries medium temp condensing units with hermetic. Jun 02, 2019 a refrigerant is a substance or mixture.
Mseries low temp condensing units with scroll compressors mseries. The new class of hfo refrigerants are based on the propylene propene molecule r1270, ch 3 ch ch 2. Dec 06, 2017 shortcuts to remember designation and their chemical formula for organic refrigerants, refrigerants are r11, r12, r22, r1, r114, r4. Some remarks on the nomenclature of refrigerants sciencedirect.
This section presents data for the thermodynamic and transport properties of refrigerants, arranged for the occasional users. It does not present official positions of the society nor reflect society policy. For example, classification of refrigerants derivatives of hydrocarbons, saturated and consisting of one substance only shown in the example below. Pdf refrigerant types, issues, trends and future options. Jan 17, 2017 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. Refrigerant types, issues, trends and future options. Prefixes typically consist of the letters h, c, f and c, whereby h stands for hydrogen, the first c for. The model nomenclature denotes if the compressor is charged with a poe lubricant. Refrigerants and their application presented by thomas e. This checklist has been prepared by sspc 34 to assist applicant preparation of a new refrigerant application in accordance with the requirements of ansiashrae standard 3420, designation and safety classification of refrigerants. It is used as a replacement for r11 a group a refrigerant that is a cfc.
Nomenclature of organic refrigerant is very easy to. As the slurried polyethylene is removed, isobutane is flashed off, and condensed, and recycled back into the loop reactor for this purpose. Designation and safety classification of refrigerants. A comparison between refrigerants used in air conditioning. Specifications of embraco refrigeration compressors. The engineering nomenclature of refrigerants, as defined by ashrae socalled r names, and iupac nomenclature are compared. This document is highly rated by mechanical engineering students and has been viewed 38 times. The tables contained on this page list approved refrigerant numbers from standard 34, which describes a shorthand way of naming refrigerants and assigns. Common refrigerants are frequently referred to as freon. These are the mixtures of two or more refrigerants and behave as a compound. Many accounts will trace refrigerants all the way back to the mid1700s when scientists were doing early experiments with evaporation and noticing that the temperature would drop significantly. Addendum c to ansiashrae standard 342001 3 a the molecular mass and normal boiling point are not part of this standard. Tricks to remember designation and their chemical formula for. Refrigerant history and nomenclature part 2 forward engineers.
The following ratings are verified by test for the reclaimed refrigerant certification program. Hfchfo refrigerants require the use of a poe lubricant to provide proper miscibility and lubricity. The unsaturated carbon bond gives rise to the term olefin. Oct 04, 2016 hey guys, refrigerants is nothing but. Refrigerants are classified by ashrae, and their friends r numbers are assigned in accordance with certain rules. Group b refrigerants are toxic, so users of these need to be more cautious. Environmental safety issues have led to calls for the careful investigation of currently used refrigerants hfcs and potentially applicable hc refrigerants r290. Refrigerants having either oxygen or nitrogen molecules in their structure, such as ammonia, are grouped separately and have a separate nomenclature from the halogenated refrigerants. Application guidelines copeland scroll compressors for air. Seminar is focused on the fundamentals of vapor compression refrigeration system which is principally applicable for all automotive, domestic and industrial airconditioning and refrigeration applications.
Some of the refrigerants in group b are described in more detail below. The process is not easy, and although there are alternatives to old refrigerants. Refrigeration system specification sheetsmasterbilt. Pdf seminar is focused on the fundamentals of vapor compression refrigeration system which is principally applicable for all automotive, domestic and.
The following is a list of refrigerants with their typeprefix, ashrae designated numbers, iupac chemical name, molecular formula, cas registry number blend name, atmospheric lifetime in years, semiempirical ozone depletion potential, net global warming potential over a 100year time horizon, occupational exposure limitpe. Refrigerants nomenclature is discussed along with a simple question based on ese pattern. Chemical names are frequently used in place of the numbers for common materials such as trichloroethylene and chloroform. Chemical refrigerants are assigned an r number which is determined systematically according to molecular structure. Classify refrigerants into primary and secondary, and. Class 1 refrigerants used in the standard compression type cooling system. Desirable properties and commonly used refrigerants. The tables contained on this page list approved refrigerant numbers from standard 34, which describes a shorthand way of naming refrigerants and assigns safety classifications based on toxicity and flammability data.
Full details of the nomenclature system are specified in ansiashrae standard 341992 with additional annual supplements. The generally preferred oil for use with hfcs is a polyol ester poe that has an additive package for refrigeration applications. In the chevron phillips slurry process for making highdensity polyethylene, isobutane is used as a diluent. A refrigerant is a substance, usually a fluid chemical compounds, that is used in a refrigeration cycle to cool a space. Fellow ashrae mcquay international staunton, virginia usa 1 what is a refrigerant. The components in the mixture have different boiling points, and thus the refrigerant mixture. Discuss the importance of selection of suitable refrigerant in a refrigeration system section 26. Refrigerants are classified according to their way of absorption or extraction of heat from substances stored in the refrigerator. Jan 10, 2017 therefore, i present our first two part series, refrigerant history and nomenclature. If the eighth character in the model nomenclature is the letter e then the. 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. 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. The following is a list of refrigerants with their typeprefix, ashrae designated numbers, iupac chemical name, molecular formula, cas registry number blend name, atmospheric lifetime in years, semiempirical ozone depletion potential, net global warming potential over a 100year time horizon, occupational exposure limitpermissible exposure.