Which refrigerants are supported?

The tool supports R-22, R-134a, and R-410A.

Can I calculate pressure from temperature?

Yes. Select "Solve pressure from temperature," then enter a temperature in °C, K, or °F.

Can I calculate temperature from pressure?

Yes. Select "Solve temperature from pressure," then enter pressure in bar, MPa, kPa, or PSI.

What is the difference between absolute and gauge pressure?

Absolute pressure is referenced to a vacuum. Gauge pressure is referenced to local atmospheric pressure, which defaults to 1.01325 bar.

Is this a replacement for a refrigerant P-T chart?

No. It provides an engineering estimate and does not replace the manufacturer's P-T chart.

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Refrigerant Pressure-Temperature Lookup (R-22 / R-410A / R-134a)

Saturated pressure ↔ temperature lookup for common HVAC refrigerants via the Antoine fit ln(P) = A − B/(T_C + C): R-22 (HCFC-22), R-134a (HFC-134a), and R-410A (R-32/R-125 near-azeotropic blend). Coefficients fitted against the ASHRAE Handbook / NIST REFPROP saturation tables. Two modes: solve saturation pressure from temperature, or solve saturation temperature from pressure. Pressure may be absolute or gauge (atmospheric default 1.01325 bar) in bar/MPa/kPa/PSI; temperature in °C/K/°F. Engineering estimate only — does not replace the manufacturer's P-T chart.

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2 examples

R-410A at 7 °C -> Psat ≈ 9.87 bar absolute

R-410A. T=7 °C. ln(P)=A−B/(T+C)=11.1969−2597.81/(7+284.65). 2597.81/291.65=8.9089, 11.1969−8.9089=2.288, exp(2.288)=9.85 bar (per code 9.871).

{"result":"R-410A saturated at 7 °C. P_abs=9.8711 bar (987.11 kPa, 0.9871 MPa, 143.17 PSI). P_gauge=8.8579 bar.","metadata":{"input":{"refrigerant":"R410A","mode":"pFromT","temperature":7,"tempUnit":"°C","pressureForm":"absolute","pressureUnit":"bar","atm":1.01325},"result":{"refrigerant":"R410A","saturationTemp_C":7,"pressure_abs_bar":9.8711,"pressure_abs_kPa":987.1125,"pressure_abs_MPa":0.9871,"pressure_abs_PSI":143.1686,"pressure_gauge_bar":8.8579,"mode":"pFromT"}}}

R-134a at 30 psiG -> Tsat ≈ 0.91 °C

R-134a. P_gauge=30 PSI=30·0.0689476=2.0684 barG. P_abs=2.0684+1.01325=3.0817 bar. T=B/(A−ln(P))−C=1902.09/(9.3873−ln(3.0817))−229.32. ln(3.0817)=1.1253. 9.3873−1.1253=8.262. 1902.09/8.262=230.22−229.32=0.90 °C (per code 0.906).

{"result":"R-134a saturated at 30 PSI gauge. P_abs=3.0817 bar. T_sat=0.9063 °C (33.6314 °F).","metadata":{"input":{"refrigerant":"R134a","mode":"tFromP","pressure":30,"pressureForm":"gauge","pressureUnit":"PSI","tempUnit":"°C","atm":1.01325},"result":{"refrigerant":"R134a","pressure_abs_bar":3.0817,"pressure_gauge_bar":2.0684,"saturationTemp_C":0.9063,"saturationTemp_F":33.6314,"mode":"tFromP"}}}

Inputs

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9 options

SettingsAdjust formats, ranges, numbers, and modes.9

RefrigerantselectOptionalRefrigerant. Coefficients fitted against ASHRAE/NIST saturation tables.Input TypeselectOptionalSolve saturation pressure from temperature, or saturation temperature from pressure.TemperaturenumberOptionalSaturation temperature, in the selected Temperature Unit. Used when Input Type = pressure from temperature.Temperature UnitselectOptionalPressurenumberOptionalSaturation pressure, in the selected Pressure Unit. Used when Input Type = temperature from pressure.Pressure FormselectOptionalPressure UnitselectOptionalAtmospheric PressurenumberOptionalLocal atmospheric pressure in bar (0.5–1.5). Used to convert gauge ↔ absolute. Default 1.01325 bar (sea level).Decimal PlacesnumberOptional

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Refrigerant Pressure-Temperature Lookup (R-22 / R-410A / R-134a)

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Examples

1. Estimate R-410A pressure at 7 °C

2. Find R-134a saturation temperature from 30 PSI gauge

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