Q&A

How the refrigerants are numbered?

How the refrigerants are numbered?

According to an international agreement, refrigerants are represented by the letter R (as in Refrigerants) followed by a two- or three-digit number and, in some cases, one or two letters. The designation Rxyz is determined by the chemical composition of the molecule, as described below.

How are refrigerants numbered Ex R 134a?

The basic structure of the numbering system is the “chemical group” of refrigerant, followed by a dash (-) and a series of numbers and letters. For example, HFC-134a is represented by “HFC” as its chemical group and “134a,” which identifies the chemical composition of the refrigerant.

What is a Class 1 refrigerant?

Class 1: This class includes refrigerants that cool by phase change (typically boiling), using the refrigerant’s latent heat. Class 2: These refrigerants cool by temperature change or ‘sensible heat’, the quantity of heat being the specific heat capacity x the temperature change.

What are Nomenclature & Classification refrigerants?

Refrigerants are named using an “R” (as in Refrigerant) following by a dash and a two to four digit number. Some refrigerants will also have a letter prefix or suffix that further specifies the chemical makeup. Refrigerants are classified into 10 groups called series.

What does the A stand for in refrigerants?

non -azeotropic
A” denotes that the refrigerant is non -azeotropic.

What are the main classifications of refrigerants?

There are four main groups of refrigerants and they are determined by their chemical constituents but are generally classified as Chlorofluorocarbons (CFCs), Hydro chlorofluorocarbons (HCFCs), Hydro fluorocarbons (HFCs) and Natural Refrigerants [7]. …

How do I find a real COP?

COP (Coefficient of Performance) COP is defined as the relationship between the power (kW) that is drawn out of the heat pump as cooling or heat, and the power (kW) that is supplied to the compressor. For example: A given heat pump used for air cooling has a COP = 2.

How is the number assigned to a refrigerant?

The number assigned to each refrigerant is related to its chemical composition and the system has been formalized as ASHRAE Standard 34. Broadly, the numbering system is as follows: 000 Series Methane Based. 100 Series Ethane Based. 200 Series Propane Based.

Which is an example of a methane based refrigerant?

000 Series: These are your methane based compounds. Please note that some refrigerants may not have 3 digits like R-12 or R-22. In this instance, just like when working with a number, the leading zero was dropped. These are methane based refrigerants but we just need to remember to put the zero in front. R-12, R-11, and R-22 are all examples.

Where does the number 34 come from for refrigerants?

This standard numbering system was first developed by the DuPont company and was released for use in 1956. Since then ANSI/ASHRAE has adopted this numbering system under Standard 34. (Standard 34 is the number designation and safety classification of refrigerants.) Standard 34 is always changing and being updated by ASHRAE.

Where does the number 22 come from in refrigerants?

R is our letter prefix and 22 is our numbered suffix. This standard numbering system was first developed by the DuPont company and was released for use in 1956. Since then ANSI/ASHRAE has adopted this numbering system under Standard 34.