The results indicated that refrigerants such as r245fa, r245ca and r365mfc are good enough for recovering waste heat of temperature ranged from 350k to 520k and the optimal turbine inlet pressure. Possibilities of changeover from cfchcfc based refrigerants to hfc or hfo. Robert wozniak, pe is a member of the technical committee of the national fuel gas code, nfpa 54ansi z223. One proper method of identification is referring to a refrigerant by its ansiashrae designation. Commercial refrigeration refrigeration appliances used in retail food and cold storage warehouse sectors. Ansiashrae 342007 designation and safety classification of refrigerants includes errata sheet this standard provides an unambiguous system for numbering refrigerants and assigning compositiondesignating prefixes for refrigerants. Although the use of a number for each refrigerant covered is a concise and accurate way of designating the refrigerant, there is no intention of precluding the use of a chemical name or formula. Safety standard for refrigeration systems and designation and classification of refrigerants.
Tricks to remember designation and their chemical formula. Chemical refrigerants are assigned an r number which is determined systematically according. This class includes refrigerants that cool by phase change typically boiling, using the refrigerant s latent heat class 2. The basis of the designation of the refrigerants fluids is based on a numbering system pure fluorocarbons hfc refrigerants and their blends the refrigerants are numbered with an r, followed by the hfcnumber, given by the rules of the fluorocarbons numbering system. Most of those deleted were never used as refrigerants and the basis for their original inclusion is not apparent. Pdf refrigerant types, issues, trends and future options. The following is a list of refrigerants with their type prefix, ashrae designated numbers, iupac chemical name, molecular. It establishes a uniform system for assigning reference numbers, safety classifications, and refrigerant concentration. New refrigerants impact standards and codes dms home. This standard is directed toward the safety of persons and property on or near the premises where refrigeration facilities are located. 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. Designation and safety classification of refrigerants.
Addenda to designation and safety classifications of. This standardized numbering system was first developed by e. Ashrae standard 152010 safety standard for refrigeration. Tables listing the refrigerant designations, safety classifications and the refrigerant concentration limits are included based on data made available.
The basis of the designation of the refrigerants 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 hfcnumber, given by the rules of the fluorocarbons numbering system. Member ashrae ictionaries define safety as being free from harm or the risk of injury or loss. Some of these low gwp refrigerants are flammable and proper safety. Designation and safety classification of refrigerants approved by the ashrae standards committee on june 20, 2009. The tables contained on this page list approved refrigerant numbers from ansiashrae 342019, designation and safety classification of refrigerants, the. Ashrae standard designation and safety classification of. Designation and safety classification of refrigerants approved by the ashrae standards committee on january 29, 2003. New refrigerants designation and safety classifications e360 forum raleigh, n. A numbering system is being used to designate various refrigerants. Pdf seminar is focused on the fundamentals of vapor compression. Pdf 9 users english, pdf 5 users english, pdf 3 users english, pdf 1 user english more info on product formats.
Nomenclature of organic refrigerant is very easy to. Some of the most common refrigerants are presented, as well as the special phenomena occurring with the use of zeotropic refrigerant mixtures. It does not present official positions of the society nor reflect society policy. Bubble and dew point for blend refrigerants such as r404a, and r452a use the dew vapor pressure to. 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. This standard is under continuous maintenance by a standing standard project committee sspc for which. Shortcuts to remember designation and their chemical formula for organic refrigerants, refrigerants are r11, r12, r22, r1, r114, r4. The tables contained on this page list approved refrigerant numbers from ansi ashrae 342019, designation and safety classification of refrigerants, the. This chapter studies the properties of substances used as working fluids in compression cycles, and discusses the classification of refrigerants.
The tables contained on this page list approved refrigerant numbers from ansiashrae 342019, 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. Foreword this addendum adds a designation of r418a to the blend r29022152a 1. The designation rxyz is determined by the chemical composition of the molecule, as described below. The refrigerants are numbered with an r, followed by the hfcnumber, given by the rules of the fluorocarbons numbering system. Ansiashrae addendum c to ansiashrae standard 342010. Addendum c to ansiashrae standard 342001 1 this foreword is not part of this addendum but is included for information only. Update on new refrigerants designations and safety. Refrigerants and their application presented by thomas e. Ashrae standard 152010 establishes safeguards for life, limb, health, and property and prescribes safety requirements. Blend refrigerants such as r404a, and r452a boil and condense at varying temperatures for a given pressure. Further information can be found in the latest version of standard 34, available. Some of those deleted were used at one time but no longer.
Nearly all of the historically used refrigerants were flammable, toxic, or both. Designation and safety classification of refrigerants ashrae standard 34 assigns the refrigerant numbers and. Designation and safety classification of refrigerants ansiashrae addendum g to ansiashrae standard 342004 approved by the ashrae standards committee on june 24, 2006. Characteristics, selection and effect of refrigerants e. On the issues of refrigerant ammability, the ashrae 34 and iso 817. Ashrae standard 152016ashrae standard 342016 package.
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. Gives a simple system of referring to organic refrigerants by numbers instead of using the chemical name, formula or trade name. Refrigerant safety significant new alternatives policy. The range over which the temperature varies is referred to as temperature glide. Pdf ashrae refrigerant designations for c2chlorofluoro. Those refrigerants that receive a flammability rating of 2, 2l, or 3 in ansiashrae standard 34, designation and safety classification of refrigerants with addenda. From the number one can get some useful information about the type of refrigerant, its chemical composition, molecular weight etc. Since then it has been adopted by ansiashrae as part of standard 34 number designation and safety classification of refrigerants. By steve kujak, member ashrae flammability and new refrigerant ptions increasing concerns about the impact of refrigerants on the environment and on. Refrigerants may be divided into three classes according to their manner of absorption or extraction of heat from the substances to be refrigerated. Although refrigerants can pose one or more of these risks, system design, engineering controls, and other techniques mitigate this risk for the use of refrigerant in various types of equipment.
New refrigerants for vapour compression refrigeration and. Leave covered under the family and medical leave act fmla must be designated as fmlaprotected and the employer must inform the employee of the amount of leave that will be counted against the employees fmla leave entitlement. It also establishes a system for assigning a safety classification to refrigerants based on toxicity and flammability data, and provides a means of determining the refrigerant concentration limit. These refrigerants are given a 500 series ashrae designation and behave like a single refrigerant.
These refrigerants cool by temperature change or sensible heat, the quantity of heat being. A vessel in a refrigerating system designed to ensure the availability of adequate liquid refrigerant for proper functioning of the system, and to store the liquid refrigerant when the system is pumped down. Ashrae assigns numbers and safety classification to the refrigerants based on toxicity and flammability data submitted by the refrigerants producer. Ansiashrae standard 34, designation and safety classification of refrigerants astm e681, standard test method for concentration limits of flammability of chemicals vapours and gases 3 terms, definitions, abbreviated terms and symbols 3. Standard 34 ashrae standard 34, designation and safety classification of refrigerants, establishes a simple means of referring to common refrigerants rather than by their chemical name, formula, or trade name. Refrigerants designation and safety classification. Designation and safety classification of refrigerants ansiashrae addendum i to ansiashrae standard 342004 approved by the ashrae standards committee on january 27, 2007. View abstract product details document history iso 817. Includes all amendments and changes through amendment 1, november 2017. For the pur pose of deciding whether a par ticular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in. Those refrigerants that meet the definition of a compressed gas and have a minimum cylinder service pressure exceeding 3447 kpa gage. Designation and safety classification of refrigerants, ashrae, atlanta ga, 2007. Retail food includes the refrigeration equipment found in. Most backordered items can be rushed in from the publisher in as little as 24.
New refrigerants designation and safety classifications. Ashrae standard 34 assigns the refrigerant numbers and determines the proper. Standard 34 describes a shorthand way of naming refrigerants and assigns safety classifications based on toxicity and flammability data, while standard 15 establishes procedures for design, construction, installation, inspection, testing, and operation of the equipment and systems using those refrigerants. Current proposal is to colabel and use 1 standard standard purpose designation identify all types of refrigerants short hand r123 instead of 2,2 dichloro1,1,1trifluoroethane safety. Ansiashrae 152016 packaged with standard 342016 safety standard for refrigeration systems and designation and classification of refrigerants ansi approved pdf download skip to the end of the images gallery. The paper on refrigerants has been divided in two parts. The designation rxyz is determined by the chemical composition of the molecule, as. Designation and safety classification of refrigerants pdf. Standard 34 describes a shorthand way of naming refrigerants and assigns safety classifications based on toxicity and flammability data, while standard 15 establishes procedures for operating equipment and systems when using those refrigerants. The philosophy of the cleanup is to limit the standards focus to refrigerants remaining in use in. Ashrae standard 34, designation and safety classification of refrigerants, establishes a simple means of referring to common refrigerants rather than by their chemical name, formula, or trade name.
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