FrigProp is a free, browser-based refrigerant properties calculator and vapor-compression refrigeration cycle (VCRC) analysis tool. No installation required — all computation runs locally in your browser using precomputed thermodynamic property tables sourced from CoolProp.

Property lookup — specify any two independent properties (temperature & pressure, pressure & enthalpy, pressure & entropy, temperature & quality, or saturation state) and retrieve the full thermodynamic state: temperature, pressure, specific enthalpy, specific entropy, internal energy, specific volume, density, and vapor quality.

Cycle analysis — set evaporator and condensing temperatures, optional superheat and subcooling, and isentropic efficiency to compute the coefficient of performance (COP) for cooling and heating modes, compressor work, evaporator and condenser heat transfer, pressure ratio, and compressor discharge temperature. Results include an interactive T-s or P-h diagram with the saturation dome and all four cycle state points. Two refrigerants can be analyzed side-by-side for direct comparison.

Supported refrigerants (27): Modern low-GWP HFOs and blends — R-32, R-1234yf, R-1234ze(E), R-1233zd(E), R-454B, R-452B, R-513A, R-152a; common HFCs — R-134a, R-410A, R-407C, R-404A, R-507A, R-23; legacy refrigerants — R-22, R-123, R-12, R-11; natural refrigerants — R-744 (CO₂), R-717 (ammonia/NH₃), R-290 (propane), R-1270 (propylene), R-600a (isobutane), R-600 (n-butane), R-170 (ethane), R-718 (water/steam), R-E170 (dimethyl ether).

The cycle diagram can be downloaded as a PNG image using the ⬇ PNG button in the diagram toolbar. Units toggle between SI (°C, kPa, kJ/kg) and US customary (°F, psia, BTU/lb). FrigProp is intended for HVAC engineers, refrigeration system designers, mechanical engineering students, and anyone performing preliminary refrigerant selection or equipment screening.