Refrigeration tools
A superheat and subcooling calculator and a printable pressure–temperature chart for each of 28 refrigerants, from the saturation tables computed with CoolProp. No account needed.
Calculator
Superheat and subcooling calculator
Superheat from the suction pressure and suction line temperature, subcooling from the liquid line pressure and temperature, for 28 refrigerants. A blend’s superheat is read from its dew point and its subcooling from its bubble point. It runs in your browser, on a phone as well as a desk.
Printable P–T charts
| Refrigerant | P–T chart | Calculator | Temperatures |
|---|---|---|---|
| R-12Dichlorodifluoromethane | R-12 chart (PDF) | Calculate | −70 to 110 °Csaturation |
| R-22Chlorodifluoromethane | R-22 chart (PDF) | Calculate | −70 to 94 °Csaturation |
| R-23Trifluoromethane | R-23 chart (PDF) | Calculate | −70 to 24 °Csaturation |
| R-32Difluoromethane | R-32 chart (PDF) | Calculate | −70 to 76 °Csaturation |
| R-134a1,1,1,2-Tetrafluoroethane | R-134a chart (PDF) | Calculate | −70 to 100 °Csaturation |
| R-170Ethane | R-170 chart (PDF) | Calculate | −70 to 30 °Csaturation |
| R-290Propane | R-290 chart (PDF) | Calculate | −70 to 94 °Csaturation |
| R-404AR-125/143a/134a (44/52/4) | R-404A chart (PDF) | Calculate | −70 to 70 °Cbubble and dew |
| R-407AR-407A (R-32/125/134a) | R-407A chart (PDF) | Calculate | −70 to 76 °Cbubble and dew |
| R-407CR-32/125/134a (23/25/52) | R-407C chart (PDF) | Calculate | −70 to 84 °Cbubble and dew |
| R-407FPerformax LT (R-32/125/134a) | R-407F chart (PDF) | Calculate | −70 to 76 °Cbubble and dew |
| R-410AR-32/R-125 (50/50) | R-410A chart (PDF) | Calculate | −70 to 70 °Cbubble and dew |
| R-449AOpteon XP40 (R-32/125/1234yf/134a) | R-449A chart (PDF) | Calculate | −70 to 74 °Cbubble and dew |
| R-452AOpteon XP44 (R-32/125/1234yf) | R-452A chart (PDF) | Calculate | −70 to 68 °Cbubble and dew |
| R-454AOpteon XL40 (R-32/1234yf) | R-454A chart (PDF) | Calculate | −70 to 72 °Cbubble and dew |
| R-454BOpteon XL41 (R-32/1234yf) | R-454B chart (PDF) | Calculate | −70 to 68 °Cbubble and dew |
| R-454COpteon XL20 (R-32/1234yf) | R-454C chart (PDF) | Calculate | −70 to 78 °Cbubble and dew |
| R-455ASolstice L40X (CO2/R-32/1234yf) | R-455A chart (PDF) | Calculate | −70 to 72 °Cbubble and dew |
| R-502R-502 (R-22/115 azeotrope) | R-502 chart (PDF) | Calculate | −70 to 70 °Cbubble and dew |
| R-507AR-125/143a (50/50) | R-507A chart (PDF) | Calculate | −70 to 68 °Cbubble and dew |
| R-508AR-23/116 (39/61) | R-508A chart (PDF) | Calculate | −70 to −2 °Cbubble and dew |
| R-513AOpteon XP10 (R-1234yf/134a) | R-513A chart (PDF) | Calculate | −70 to 90 °Cbubble and dew |
| R-600aIsobutane | R-600a chart (PDF) | Calculate | −70 to 132 °Csaturation |
| R-717Ammonia | R-717 chart (PDF) | Calculate | −70 to 130 °Csaturation |
| R-744Carbon Dioxide | R-744 chart (PDF) | Calculate | −56 to 28 °Csaturation |
| R-1234yf2,3,3,3-Tetrafluoropropene | R-1234yf chart (PDF) | Calculate | −52 to 92 °Csaturation |
| R-1234zetrans-1,3,3,3-Tetrafluoropropene | R-1234ze chart (PDF) | Calculate | −70 to 108 °Csaturation |
| R-1270Propylene (Propene) | R-1270 chart (PDF) | Calculate | −70 to 90 °Csaturation |
Each chart is one A4 page: every 2 K of the refrigerant’s table against pressure in kPa gauge and bar gauge, bubble and dew for a blend, with its safety class, GWP and ODP and their sources. The figures are its refrigerant page’s own, computed with CoolProp 7.2.1dev.
R-448A and R-450A have no chart: CoolProp can’t form them, and Kelvin holds no other source it may republish.
Design with these refrigerants in Kelvin
Kelvin’s Free plan includes the refrigerant library, P–h diagrams, single-stage cycles and draft reports. Paid plans carry a system on through pipework, equipment, charge, energy and cost to issued reports.
Verify before relying on these figures
The property figures are computed with CoolProp from published equations of state. They must be verified by a qualified professional before they’re relied on.