R1234yf pressure temperature chart (PT)
R1234yf saturation pressure vs temperature (PT chart): a CoolProp-generated reference table in kPa(a), bar(a), and psi(a), plus how to interpret it safely (not diagnostic targets).
An R1234yf pressure temperature chart (often called a "PT chart") is a saturation lookup: it tells you what pressure corresponds to boiling/condensing at a given temperature (or the other way around). This is useful for interpreting saturation behavior -- but it is not a "normal running pressure" diagnostic chart for an automotive A/C system.
What this table is (and isn't)
- It is: saturation pressure Psat(T) for R1234yf (two-phase equilibrium).
- It is not: a high-side / low-side "target pressure" table while the system is running.
- It is not: a substitute for OEM service procedures, safety requirements, or local regulation.
If you want the higher-level context first, start here: Refrigerant PT chart (how to read it) and Car A/C pressure chart (why "normal pressures" vary).
Pressure basis: absolute vs gauge
The table below is absolute pressure (kPa(a), bar(a), psi(a)). Many gauges display gauge pressure (relative to ambient). Converting requires local atmospheric pressure:
Pabs = Pgauge + Patm
Patm changes with altitude and weather, so "psig" conversions are never universally correct. Learn more: Gauge vs absolute pressure (psig vs psia).
R1234yf saturation pressure vs temperature (reference table)
Generated using CoolProp (the same property engine used by FluidTool) at Q=0 saturation (pure fluid; bubble and dew coincide). Values are rounded for readability.
| T ( deg C) | T ( deg F) | Psat (kPa(a)) | Psat (bar(a)) | Psat (psi(a)) |
|---|---|---|---|---|
| -20 | -4 | 150.9 | 1.509 | 21.9 |
| -10 | 14 | 221.8 | 2.218 | 32.2 |
| 0 | 32 | 315.8 | 3.158 | 45.8 |
| 10 | 50 | 437.5 | 4.375 | 63.5 |
| 20 | 68 | 591.7 | 5.917 | 85.8 |
| 30 | 86 | 783.5 | 7.835 | 113.6 |
| 40 | 104 | 1018.4 | 10.184 | 147.7 |
| 50 | 122 | 1302.3 | 13.023 | 188.9 |
| 60 | 140 | 1641.9 | 16.419 | 238.1 |
| 70 | 158 | 2044.5 | 20.445 | 296.5 |
How to verify any row in FluidTool
- Open FluidTool with R1234yf selected: /?fluid=R1234yf
- Choose a Two-phase input pair (Temperature & Quality / T + Q).
- Set Q=0 and enter the temperature from the table to read Psat.
For interpretation in a running system, combine saturation with superheat/subcooling concepts -- and always follow OEM procedures.
Related
- R1234yf data sheet: basic identifiers and thermodynamic context.
- Refrigerant PT chart: what Tsat(P)/Psat(T) means and common pitfalls.
- Car A/C pressure chart: why "normal pressure" tables are not universal.
- Back to Wiki
- Open the tool
R1233zd(E) pressure temperature chart (PT)
R1233zd(E) saturation pressure vs temperature (PT chart): a CoolProp-generated reference table in kPa(a), bar(a), and psi(a), plus safe interpretation notes (not diagnostic targets).
R1234yf vs R134a pressure temperature chart (PT)
R1234yf vs R134a saturation pressure vs temperature (PT chart): a CoolProp-generated comparison table in kPa(a), bar(a), and psi(a), with notes on safe interpretation (not diagnostic targets).