Technical

National Refrigerants, Ltd. R-134a Guidelines

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Physical Properties of Refrigerants R-134a

Environmental Classification HFC
Molecular Weight 102
Boiling Point (1 atm, ºC) -26.1
Critical Pressure (bar-abs) 40.6
Critical Temperature (ºC) 101.1
Critical Density (Kg/m^3) 511.9
Liquid Density (25 ºC, Kg/m^3) 1206.7
Vapor Density (bp, Kg/m^3) 5.258
Heat of Vaporization (bp, KJ/Kg) 216.97

Ozone Depletion Potential (CFC 11 = 1.0) 0

Global Warming Potential (CO2 = 1.0) 1430
ASHRAE Standard 34 Safety Rating A1

Composition: pure R-134a (tetrafluoroethane)

Application: refrigeration (especially smaller appliances), automotive air conditioning

(phaseout subject to F-Gas regulations for new designs)

Performance: R-134a performance suffers at lower evaporator temperatures. In general it

is not applied at temperatures below -23 deg C, and it is not necessarily the most
economical overall choice in some other applications. Traditional R-12 type applications
have adopted several products as alternatives, including R-134a, R-22, R-404A/R-507,
and numerous blends.

Lubricant: R-134a requires polyolester (POE) lubricants, primarily for their ability to mix
with HFC refrigerants. Traditional mineral oils and alkylbenzene do not mix with HFCs and
will cause compressor failures. In addition, automotive air conditioning systems may also
use polyalkaline glycol (PAG) lubricants (not typically seen in stationary equipment). Both
POEs and PAGs will absorb moisture, and hold onto it, to a much greater extent than
traditional lubricants. The moisture will promote reactions in the lubricant as well as the
usual problems associated with water (corrosion, acid formation, etc.). The best way to dry
a wet HFC system is to use a filter drier - run the system and change the drier - instead of
relying on evacuation to clear the water.

R-134a
Available in the following sizes:

30R134aRT 12 Kg RETURNABLE CYLINDER

55R134aRT 25 Kg RETURNABLE CYLINDER
125R134aRT 57 Kg RETURNABLE CYLINDER
1763R134aRT 800 Kg RETURNABLE DRUM

A30R134aRT 13.6 Kg AUTOMOTIVE RETURNABLE CYLINDER

SINGLE ¼” FLARE VALVE

30R134aN 13.6 Kg DISPOSABLE DOT CYLINDER (EXPORT ONLY)

Refrigerant Reference Guide Supplementary Edition

 Technical
National Refrigerants, Ltd.
Guidelines
______________________________________________________________________________________________________________________________

    THERMODYNAMIC PROPERTIES OF R-134a  

               
Temp Pressure Density (L) Density (V) Enthalpy (L) Enthalpy (V) Entropy (L) Entropy (V)
[C]   [bar]   [kg/m^3]   [kg/m^3]   [kJ/kg]   [kJ/kg]   [kJ/kg-­‐C]   [kJ/kg-­‐C]  
-30 0.844 1388.4 4.426 160.8 380.3 0.8486 1.752
-28 0.927 1382.4 4.836 163.3 381.6 0.8591 1.749
-26 1.017 1376.5 5.275 165.9 382.8 0.8694 1.747
-24 1.113 1370.4 5.745 168.5 384.1 0.8798 1.745
-22 1.217 1364.4 6.248 171.1 385.3 0.8900 1.743
-20 1.327 1358.3 6.785 173.6 386.6 0.9003 1.741
-18 1.446 1352.1 7.357 176.2 387.8 0.9104 1.740
-16 1.573 1345.9 7.967 178.8 389.0 0.9205 1.738
-14 1.708 1339.7 8.617 181.4 390.2 0.9306 1.736
-12 1.852 1333.4 9.307 184.1 391.5 0.9407 1.735
-10 2.006 1327.1 10.04 186.7 392.7 0.9507 1.733
-8 2.169 1320.8 10.82 189.3 393.9 0.9606 1.732
-6 2.343 1314.3 11.65 192.0 395.1 0.9705 1.731
-4 2.527 1307.9 12.52 194.7 396.3 0.9804 1.729
-2 2.722 1301.4 13.45 197.3 397.4 0.9902 1.728
0 2.928 1294.8 14.43 200.0 398.6 1.000 1.727
2 3.146 1288.1 15.47 202.7 399.8 1.010 1.726
4 3.377 1281.4 16.56 205.4 400.9 1.020 1.725
6 3.620 1274.7 17.72 208.1 402.1 1.029 1.724
8 3.876 1267.9 18.94 210.8 403.2 1.039 1.723
10 4.146 1261.0 20.23 213.6 404.3 1.049 1.722
12 4.430 1254.0 21.58 216.3 405.4 1.058 1.721
14 4.729 1246.9 23.02 219.1 406.5 1.068 1.720
16 5.043 1239.8 24.52 221.9 407.6 1.077 1.720
18 5.372 1232.6 26.11 224.7 408.7 1.087 1.719
20 5.717 1225.3 27.78 227.5 409.8 1.096 1.718
22 6.079 1218.0 29.54 230.3 410.8 1.106 1.717
24 6.458 1210.5 31.39 233.1 411.8 1.115 1.717
26 6.854 1202.9 33.34 236.0 412.8 1.125 1.716
28 7.269 1195.2 35.38 238.8 413.8 1.134 1.715
30 7.702 1187.5 37.54 241.7 414.8 1.144 1.715
32 8.154 1179.6 39.80 244.6 415.8 1.153 1.714
34 8.626 1171.6 42.18 247.5 416.7 1.162 1.713
36 9.119 1163.4 44.68 250.5 417.7 1.172 1.712
38 9.632 1155.1 47.32 253.4 418.6 1.181 1.712
40 10.17 1146.7 50.09 256.4 419.4 1.191 1.711
42 10.72 1138.2 53.00 259.4 420.3 1.200 1.710
44 11.30 1129.5 56.06 262.4 421.1 1.209 1.710
46 11.90 1120.6 59.29 265.5 421.9 1.219 1.709
48 12.53 1111.5 62.69 268.5 422.7 1.228 1.708
50 13.18 1102.3 66.27 271.6 423.4 1.238 1.707
52 13.85 1092.9 70.05 274.7 424.2 1.247 1.706
54 14.56 1083.2 74.03 277.9 424.8 1.256 1.706
56 15.28 1073.4 78.24 281.1 425.5 1.266 1.705
58 16.04 1063.2 82.68 284.3 426.1 1.275 1.704

Refrigerant Reference Guide Supplementary Edition