R-290 (Propane) Pressure at 75°F — Saturation P-T Data
How This Was Calculated
Saturation pressure interpolated from ASHRAE tabular data for R290. Normal operating pressure range.
- P_sat
- Saturation pressure: 154 PSI
- T_input
- Input temperature: 75°F
- T_data
- ASHRAE tabular reference data: R290
Important Considerations
The saturation pressure shown (for R290 at 75°F) is the baseline for measuring superheat and subcooling. Suction superheat = suction line temperature minus evaporator saturation temperature. Subcooling = condensing saturation temperature minus liquid line temperature. Typical targets: 8–12°F superheat at the evaporator (TXV systems), 10–20°F subcooling at the condenser. Deviations indicate improper charge, metering device issues, or non-condensables.
R-290 (propane) is classified A3 (highly flammable). Strict charge limits apply (typically under 150g for residential). Only use in equipment specifically designed and UL-listed for R-290. Never use near open flames or ignition sources. Proper ventilation is critical.
R290 has a GWP of 3 — meaning 1 lb released equals 3 lbs of CO2 equivalent warming over 100 years. This is a low-GWP refrigerant and is considered environmentally preferable under current and projected regulations. It aligns with AIM Act long-term goals and is unlikely to face near-term restrictions. Choosing low-GWP equipment protects against future regulatory compliance costs.
Saturation pressure-temperature data for R290 derived from ASHRAE Fundamentals Handbook, Chapter 30 (Thermophysical Properties of Refrigerants), and verified against manufacturer published data (Chemours Opteon, Honeywell Solstice). Values represent saturated conditions at sea level.