What does 134a stand for in refrigerant HFC-134a?

Answer 1

It is a convention that identifies some details of the molecule.

Here are the rules:

CFC-01234a where 0 = number of double bonds ( omitted if zero )
1 = Carbon atoms - 1 ( omitted if 0 )
2 = Hydrogen atoms + 1
3 = Fluorine atoms
4 = Chlorine atoms replaced by Bromine ("B" prefix added )
a = letter added to identify isomers, the "normal" isomer in any number has the smallest mass difference on each carbon, and a, b, or c are added as the masses diverge from normal.

If the compound is cyclic, then the number is prefixed with "C". There are
several other refrigerants, some of which are hydrocarbons, hydrocarbon
blends, or CFC blends. Full details of the nomenclature system are specified
in ANSI/ASHRAE Standard 34-1992 with additional annual supplements. Chemical
names are frequently used in place of the numbers for common materials
- such as trichloroethylene and chloroform. The specified ANSI/ASHRAE
prefixes were FC ( FluoroCarbon ), or R ( Refrigerant ), but today most are
prefixed by more specific classifications - such as CFC, HCFC, and HFC.

CFC-11 CCl3F trichlorofluoromethane [75-69-4]
CFC-12 CCl2F2 dichlorodifluoromethane [75-71-8]
CFC-113 CCl2F-CClF2 1,1,2-trichlorotrifluoroethane [76-13-1]
HCFC-22 CHClF2 chlorodifluoromethane [75-45-6]
HCFC-123 CHCl2-CF3 2,2-dichloro-1,1,1-trifluoroethane [306-83-2]
HCFC-123a CHClF-CClF2 1,2-dichloro-1,1,2-trifluoroethane [354-23-4]
HFC-23 CHF3 trifluoromethane [75-46-7]
HFC-134 CHF2-CHF2 1,1,2,2-tetrafluoroethane [359-35-3]
HFC-134a CH2F-CF3 1,2,2,2-tetrafluoroethane [811-97-2]
R-20 CHCl3 chloroform [67-66-3]
R-22B1 CHBrF2 bromodifluoromethane [1511-62-2]
R-1120 CHCl=CCl2 trichloroethylene [79-01-6]
R-1150 CH2=CH2ethylene [74-85-1]
R-C316 C4Cl2F6 1,2-dichlorohexafluorocyclobutane

Another technique for naming CFCs uses the addition of 90 to the CFC number
to produce a "def" number which corresponds to the CHF composition. If
(e + f) < (2d + 2), then additional atoms are required for saturation. This
technique has been described in detail in the Journal of Chemical Education
[3].

ASHRAE +90 Empirical Composition Formula
C H F (+Cl)
CFC-11 101 1 - 1 3 CCl3F
CFC-12 102 1 - 2 2 CCl2F2
HCFC-22 112 1 1 2 1 CHClF2
HCFC-123 213 2 1 3 2 CHCl2-CF3
HFC-134a 224 2 2 4 - CH2F-CF3

Halons are numbered according to a totally different system developed by
the US Army Corps of Engineers, and the prefix term is always "Halon".
Hydrogen is not numbered, and terminal zeros are not expressed.

Halon-0123 where 0 = number of carbon atoms
1 = number of fluorine atoms
2 = number of chlorine atoms
3 = number of bromine atoms

Halon-1211 CBrClF2 bromochlorodifluoromethane [353-59-3]
Halon-1301 CBrF3 bromotrifluoromethane [75-63-8]
Halon-2402 CBrF2-CBrF2 1,2-dibromo-1,1,2,2-tetrafluoroethane [124-73-2]

Answer 2

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The main difference between r-22 (hcfc) and r-134a (hfc) is the absence of chlorine. Chlorine is the element that reacts with the ozone layer, so all cfc and hcfc refrigerants will eventually be replaced with hfc refrigerants. R-12 (cfc), which was used in automobile a/c systems, has not been manufactured for about 15 years. It is still available, but very expensive. Automobile a/c systems now use r-134a. Old r-12 systems can be retrofitted to use r-134a. Residential and commercial a/c systems use r-22. New units that use r-22 will no longer me manufactured after 2010, but R-22 refrigerant will still be manufactured until 2020, although the price is rising every year. The new refrigerant used in residential and commercial a/c systems is called r-410a (hfc). You may see it advertised as "Puron". You CANNOT retrofit a r-22 system to work with r-410a. It would require a complete system change out.

Answer 3

Hfc Stands For

Answer 4

It could be the serial number ie the 134 type of HFC. Johan

Answer 5

Its the type of coolant use in your unit