R134a Properties
Reference data and engineering information about r134a properties for miscellaneous applications.
Overview
Engineering reference data for R134a Properties in miscellaneous.
Key Formulas
Unit Conversion
Multiply by conversion factor.
Linear Interpolation
Estimate between two known points.
Percentage
Part as fraction of whole.
Variables
| Symbol | Description | Unit |
|---|---|---|
| Input value | — | |
| Output value | — | |
| Conversion factor | — |
Property Tables
Refrigerant R-134a exhibits distinct thermodynamic properties at saturation conditions across a range of temperatures. The following tables summarize key data in both Imperial and SI units.
Temperature(°F) | Pressure(psia) | Density (Liquid)(lb/ft³) | Specific Volume (Vapor)(ft³/lb) | Enthalpy (Liquid)(BTU/lb) | Enthalpy (Vapor)(BTU/lb) |
|---|---|---|---|---|---|
| -150 | 0.07107 | 102.34 | 457.07 | -32.781 | 80.212 |
| -125 | 0.28333 | 99.64 | 123.44 | -25.383 | 83.716 |
| -100 | 0.89915 | 96.89 | 41.52 | -17.939 | 87.245 |
| -75 | 2.3866 | 94.09 | 16.56 | -10.472 | 90.76 |
| -50 | 5.4966 | 91.22 | 7.56 | -2.995 | 94.248 |
| -25 | 11.2964 | 88.28 | 3.83 | 4.503 | 97.721 |
| -15 | 14.6686 | 87.08 | 2.99 | 7.518 | 99.109 |
| -10 | 16.6293 | 86.47 | 2.66 | 9.03 | 99.804 |
| -5 | 18.7906 | 85.86 | 2.37 | 10.546 | 100.499 |
| 0 | 21.1665 | 85.25 | 2.12 | 12.067 | 101.195 |
| 5 | 23.771 | 84.63 | 1.9 | 13.593 | 101.891 |
| 10 | 26.619 | 84.01 | 1.7 | 15.125 | 102.587 |
| 25 | 36.773 | 82.11 | 1.25 | 19.763 | 104.677 |
| 50 | 60.032 | 78.84 | 0.781 | 27.666 | 108.149 |
| 75 | 93.08 | 75.39 | 0.507 | 35.851 | 111.553 |
| 100 | 138.28 | 71.7 | 0.34 | 44.393 | 114.782 |
| 125 | 198.27 | 67.68 | 0.232 | 53.385 | 117.66 |
| 150 | 276.12 | 63.13 | 0.159 | 62.989 | 119.879 |
| 175 | 375.69 | 57.6 | 0.107 | 73.581 | 120.788 |
| 200 | 502.54 | 49.44 | 0.065 | 86.528 | 118.155 |
Source: engineeringtoolbox.com
Note: The data above includes pressure in psia. The original table also contained pressure in psig and a note for temperatures below -14.7 psia (where pressure is referenced in inches of mercury below one atmosphere).
Temperature(°C) | Absolute Pressure(bar) | Density (Liquid)(kg/m³) | Density (Vapor)(kg/m³) | Enthalpy (Liquid)(kJ/kg) | Enthalpy (Vapor)(kJ/kg) | Entropy (Liquid)(kJ/(kg·K)) | Entropy (Vapor)(kJ/(kg·K)) |
|---|---|---|---|---|---|---|---|
| -60 | 0.15935 | 1472 | 0.9291 | 24.491 | 261.491 | 0.68772 | 1.8014 |
| -50 | 0.29477 | 1444.9 | 1.6526 | 36.302 | 267.779 | 0.74358 | 1.7809 |
| -40 | 0.51225 | 1417 | 2.773 | 48.631 | 274.068 | 0.79756 | 1.76448 |
| -30 | 0.84379 | 1388.2 | 4.4307 | 61.13 | 280.324 | 0.84995 | 1.75142 |
| -20 | 1.32719 | 1358.4 | 6.7903 | 73.833 | 286.513 | 0.901 | 1.74113 |
| -10 | 2.00575 | 1327.4 | 10.047 | 86.777 | 292.598 | 0.95095 | 1.73309 |
| 0 | 2.92769 | 1295.1 | 14.433 | 100 | 298.536 | 1 | 1.72684 |
| 10 | 4.14571 | 1261.2 | 20.226 | 113.54 | 304.276 | 1.04834 | 1.72196 |
| 20 | 5.71665 | 1225.5 | 27.773 | 127.437 | 309.756 | 1.09613 | 1.71806 |
| 30 | 7.70132 | 1187.5 | 37.517 | 141.736 | 314.892 | 1.14354 | 1.71473 |
| 40 | 10.1648 | 1146.7 | 50.055 | 156.491 | 319.575 | 1.19073 | 1.71152 |
| 50 | 13.1773 | 1102.2 | 66.234 | 171.778 | 323.652 | 1.23794 | 1.70792 |
| 60 | 16.8156 | 1052.9 | 87.346 | 187.715 | 326.896 | 1.28548 | 1.70325 |
| 70 | 21.1668 | 996.49 | 115.564 | 204.515 | 328.941 | 1.3339 | 1.6965 |
| 80 | 26.3336 | 928.78 | 155.13 | 222.616 | 329.095 | 1.38434 | 1.68585 |
| 90 | 32.4489 | 838.51 | 216.936 | 243.168 | 325.655 | 1.43978 | 1.66692 |
| 100 | 39.7254 | 649.71 | 367.064 | 273.641 | 309.037 | 1.5198 | 1.61466 |
Source: engineeringtoolbox.com
Data Note: The enthalpy liquid value for 0°C in the source data was listed as 1000.0 kJ/kg, which is likely a typographical error. It has been corrected to 100.000 kJ/kg in the table above for consistency with the trend in the data.
Key Identifiers and Properties
R-134a is known by several identifiers in industry:
- Chemical Formula:
- IUPAC Name: 1,1,1,2-Tetrafluoroethane
- Common Trade Names: Genetron 134a, Suva 134a
- ASHRAE Designation: HFC-134a
It is a hydrofluorocarbon (HFC) refrigerant developed as a replacement for older refrigerants like R-12 due to its zero ozone depletion potential (). It is commonly used in residential and automobile air conditioning systems.