### General Information

The CoolProp library is a standard interface between EES and the CoolProp library. CoolProp is a fluid property database written by Ian Bell and is open-source and free. In addition, REFPROP can be called through CoolProp if is installed on the computer

The general call looks like:

out = coolprop(output$ ,inputvar1$,input1,inputvar2$,input2,fluid$)

A modified SI system of units is used in CoolProp. The units employed are shown below.

### Example

The following example retrieves the enthalpy of “Methane”. The thermodynamic state is given by two variables : p and T, that are set to 1 bar (100 kPa) and 15 °C (288.15 K) respectively:

h = coolprop('H',’P',100,’T’,288.15,’Methane’)

A complete list of fluids that can be used in CoolProp() can be found at Fluid Information

The EES function coolprop() uses the same fluids and inputs as the function Props from the python wrappers. The documentation there is generally more up-to-date.

Also refer to the example file at c:\EES32\Userlib\CoolProp_EES\CoolProp_EES_Sample.ees

### Fluid Properties

Thermophysical property | Symbol | Units | Input/Output
Pressure (absolute) | P | kPa | Both
Temperature | T | K | Both
Density | D | kg/m3 | Both
Specific Enthalpy | H | kJ/kg | Both
Specific Entropy | S | kJ/kg/K | Both
Quality | Q | kg/kg | Both
Specific Internal Energy | U | kJ/kg | Output only
Specific Gibbs Function | G | kJ/kg | Output only
Specific Heat at Constant Volume | O | kJ/kg/K | Output only
Specific Heat at Constant Pressure | C | kJ/kg/K | Output only
Speed of Sound | A | m/s | Output only
Surface Tension | I | N/m | Output only
Viscosity | V | Pa·s | Output only
Thermal Conductivity | L | kW/m/K | Output only
Critical Temperature | Tcrit | K | Output only
Critical Pressure | pcrit | kPa | Output only
Minimum Temperature | Tmin | K | Output only

The following combinations of inputs are valid (in either order):

- T,P
- T,Q
- T,D
- P,H
- P,S
- P,Q

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