Heating, Ventilation and Air Conditioning
Refrigerant R134a Vapor Pressure Table
In this manual: Heating, Ventilation and Air Conditioning
~1min read
The vapor pressure table for every refrigerant is published in literature for refrigeration system engineers. This table makes it possible to determine the vapor pressure acting on the column of liquid in a vessel if the temperature of the vessel is known. Because each refrigerant has its own characteristic vapor pressure table, refrigerant can be identified by measuring the pressure and temperature.  Note At absolute pressure, 0 bar/psi corresponds to absolute vacuum. Normal ambient pressure (positive pressure) corresponds to 1 bar (14.5 psi) absolute pressure. 0 pressure corresponds to an absolute pressure of 1 bar (14.5 psi) on most pressure gauges (indicated by -1 bar (-14.5 psi) below 0 bar/psi). |
| Temperature in C (F) | Pressure in bar (psi) of R134a |
| -45 (-49) | -0.61 (-8.84) |
| -40 (-40) | -0.49 (-7.10) |
| -35 (-31) | -0.34 (-4.93) |
| -30 (-22) | -0.16 (-2.32) |
| -25 (-13) | 0.06 (0.87) |
| -20 (-4) | 0.32 (4.64) |
| -15 (5) | 0.63 (9.13) |
| -10 (14) | 1.00 (14.5) |
| -5 (23) | 1.43 (20.74) |
| 0 (32) | 1.92 (27.84) |
| 5 (41) | 2.49 (36.11) |
| 10 (50) | 3.13 (45.39) |
| 15 (59) | 3.90 (56.56) |
| 20 (68) | 4.70 (68.16) |
| 25 (77) | 5.63 (81.65) |
| 30 (86) | 6.70 (97.17) |
| 35 (95) | 7.83 (113.56) |
| 40 (104) | 9.10 (131.98) |
| 45 (113) | 10.54 (152.86) |
| 50 (122) | 12.11 (175.64) |
| 55 (131) | 13.83 (200.58) |
| 60 (140) | 15.72 (227.99) |
| 65 (149) | 17.79 (258.02) |
| 70 (158) | 20.05 (290.80) |
| 75 (167) | 22.52 (326.62) |
| 80 (176) | 25.21 (365.64) |
| 85 (185) | 28.14 (408.13) |
| 90 (194) | 31.34 (454.54) |
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