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R-134a Physical Properties:
R-134a - Tetrafluoroethane
Refrigerant of choice in automotive industry. Genetron134a replaces CFC12 for air conditioning and refrigeration
systems in commercial residential and industrial applications.
R-12 - Dichlorodifluoromethane
A versatile and widely used refrigerant. Common in reciprocating and rotary type equipment. For all types of appli-
cations, household to industrial. Also employed in some centrifugal designs and in several special
applications.
Chemical formula ................................................
Molecular weight .................................................
Boiling point at 1 atm. ..........................................
Critical temperature .............................................
Critical pressure, psia. .........................................
Critical density. Ib./cu. tt. .....................................
Liquid density at 80°F (26.7°C). Ib./cu. ft. ...........
Heat of vaporization at boiling point,
Btu/lb.°F ...............................................................
Specific heat of liquid at 80°F (26.7°C).
Btu/lb.°F ...............................................................
Specific heat of vapor at constant pressure
(1 atm.) and 80°F (26.7°C), (Btu/lb.°F) ...............
*Flammable range, %volume in air. ....................
Ozone depletion potential ....................................
Greenhouse warming potential (estimate) ..........
* Flame limits measured using ASTM E681 with electrically activated kitchen match ignition source per ASHRAE
Standard 34.
Comparative Cycle Performance:
Evaporator temperature = 20°F
Condenser temperature = 110°F
Suction superheat = 30°F
sub-cooling = 10°F
Compressor isentropic efficiency = 65%
Evaporator pressure, psi ............................... 21.0
Condenser pressure, psi ............................... 136.4
Compression ratio ........................................ 4.23
Compressor discharge temperature, °F ........ 188.1
Coefficient of performance ............................ 2.90
Refrigerant circulation per ton, Ib./min. ......... 3.80
Compressor displacement per ton, cfm. ....... 4.51
Liquid flow per ton, cu. in. /min. .................... 83.2
Latent heat at evaporator temp., Btu/lb ......... 66.5
Net refrigeration effect. Btu/lb ....................... 52.7
CF
CH
F
3
2
102.03
-15.1°F (-26.2°C)
214.0°F (101.1°C)
589.9
31.97
75.0
92.4
0.341
0.204
None
0
0.285
Refrigerant
12
22
134a
43.0
18.5
226.3
146.4
4.17
4.86
227.0
178.3
2.79
2.83
2.78
3.00
2.82
4.55
67.4
71.7
90.6
86.9
72.0
66.7
5-17
Sealed System
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