Look up fluid properties with CoolProp · Docs

CoolProp computes thermophysical properties of real fluids: water and steam, refrigerants, common gases and liquids, and incompressible mixtures. All values are SI: temperature in K, pressure in Pa, enthalpy in J/kg, entropy in J/kg/K, density in kg/m³, and quality (vapor fraction) from 0 to 1.

There are two ways to call it:

You want	Use	Charged
One state, now	the `coolprop` utility	Counts toward monthly utility calls
A grid, a curve, or many states	the `coolprop` job	Wallet, by runtime

One state (utility)

Give the fluid and two state inputs, or a single temperature or pressure for a saturation point:

from cognichem_client import CogniChem
 
client = CogniChem.from_env()
result = client.utils.run("coolprop", {
    "fluid": "Water",
    "inputs": {"T": 373.15, "P": 101325},
    "properties": ["D", "H", "Cpmass", "viscosity"],
})
print(result.data)

Leave out properties to get the standard set: T, P, D, H, S, U, Cpmass, viscosity, conductivity, and Q.

Tables and curves (job)

Set mode and its problem_spec:

`mode`	`problem_spec`	You get
`tp_grid`	`t_min`, `t_max`, `n_t`, `p_min`, `p_max`, `n_p`	Properties on a temperature × pressure grid
`saturation`	`along` (`T` or `P`), `min`, `max`, `n`	The saturation curve
`isobar`	`p`, `t_min`, `t_max`, `n_t`	Properties against temperature at one pressure
`isotherm`	`t`, `p_min`, `p_max`, `n_p`	Properties against pressure at one temperature
`batch_states`	`states`: each with a fluid and two of `T`, `P`, `H`, `S`, `D`, `Q`	A table of separate states

payload = {
    "mode": "tp_grid",
    "fluid": "R134a",
    "problem_spec": {"t_min": 250, "t_max": 350, "n_t": 21, "p_min": 1e5, "p_max": 2e6, "n_p": 20},
}
job = client.jobs.submit(job_name="r134a-grid-1", job_type="coolprop", payload=payload)
status = client.jobs.wait(job.process_id)
client.jobs.result(job.process_id, save_path=".")   # properties.csv + summary.json

The result's table port is properties.csv, which a workflow step can take as input.

Notes

fluid is any name CoolProp accepts (for example Water, CarbonDioxide, R134a, Nitrogen). backend is HEOS (the default, for pure fluids and mixtures) or INCOMP (incompressible liquids and brines).
Grid size, curve length, and state count are capped per job; see the CoolProp tool page.
For chemical equilibrium, kinetics, or ideal-gas mixtures, use Cantera.