About FrigProp

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; for zeotropic blends the temperature glide across each coil is shown too. Click anywhere on the diagram to look up that state.

Advanced Tools — a collapsed section below the diagram keeps the extras out of the way, so the main page stays a straightforward lookup and cycle. Open it for a side-by-side comparison with a second refrigerant, a suction-line (internal) heat exchanger, system capacity sizing (mass flow, compressor power, displacement), volumetric capacity and Carnot / second-law efficiency, a sensitivity sweep over evaporating or condensing temperature, a superheated vapor property table, and a list of recent cycles. Options that change the main cycle — the comparison and the heat exchanger — are flagged on the results and the diagram with an orange “Advanced” marker.

Supported refrigerants (28): Modern HFOs and lower-GWP blends — R-32, R-1234yf, R-1234ze(E), R-1233zd(E), R-454B, R-452B, R-449A, 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). After the first visit FrigProp works offline and can be installed as an app. FrigProp is intended for HVAC engineers, refrigeration system designers, mechanical engineering students, and anyone performing preliminary refrigerant selection or equipment screening.

Select Refrigerant
Properties
Select a refrigerant above.
Property Lookup
°C
kPa
Vapor-Compression Refrigeration Cycle Analysis
1 Compressor Inlet sat. vapor
°C
2 Compressor Exit derived
P = Pcond · h2 = h1 + (h2s − h1)/η(isentropic at η = 100 %)
%
3 Condenser Exit sat. liquid
°C
4 Expansion Exit derived
P = Pevap · h = h3(isenthalpic)
Diagram

Drag to pan · click a point to look it up in Property Lookup · faint lines: isobars (T-s), isotherms (P-h)

Advanced Tools
Two-Fluid Comparison

Runs the same cycle inputs for a second refrigerant. Both appear in the results and on the diagram.

Internal Heat Exchanger

Suction-line heat exchanger: condenser liquid (3 → 3′) warms the evaporator vapor (1 → 1′). Effectiveness ε is relative to the side that runs out first. This changes the main cycle — its results and diagram are marked “Advanced: IHX”.

%
System Capacity

Optional cooling capacity. Scales the per-kg cycle to refrigerant mass flow, compressor power, heat rejection and compressor displacement — the cycle itself is unchanged.

Cycle Metrics

Volumetric capacity (suction gas) and Carnot / second-law efficiency between the mean evaporating and condensing temperatures. Displacement assumes 100 % volumetric efficiency.

Calculate a cycle to see these metrics.

Sensitivity Sweep

Re-runs the last calculated cycle across a range of evaporating or condensing temperatures, holding superheat, subcooling and η. Doesn't change the main cycle.

°C
°C
Superheated Vapor Table

Property grid on a regular (T, P) lattice for the selected refrigerant — for hand checks and handouts. Cells at or below the dew point are blank.

kPa
°C
°C
K
Recent Cycles

Cycles calculated in this tab (most recent first); ☆ pins one so it survives reloads. Recall re-runs it on the main cycle.

No cycles yet.