Thermophysical Data
Introduction
The ThermophysicalData package calculates the properties of pure fluids, mixtures, solutions and humid air. The package is based on the open source CoolProp library.
withThermophysicalData:
For example, this is the temperature of carbon dioxide at a user-defined pressure and enthalpy.
Propertytemperature,pressure=6bar,massspecificenthalpy=5⋅105J kg−1,carbondioxide
296.9109661K
This is the density of a 30%-70% molar mixture of helium and nitrogen at a user-defined temperature and pressure.
Propertydensity,temperature=293 K,pressure=1atm,helium[0.3]&nitrogen[0.7]
0.8652903239kgm3
This is the wet-bulb temperature of humid air at a user-defined dry-bulb temperature, pressure, and relative humidity.
PropertyTwb,HumidAir, Tdb=293K,P=1atm,R=0.50
286.8032717K
With the data provided by this package, you can
model heat flows across thermodynamic cycles,
calculate efficiency of solar heating systems,
simulate models of heat exchangers with lumped parameters,
optimize the performance of turbines,
generate customized psychrometric charts and pressure-enthalpy diagrams,
and more
The package is units-aware, and can be used with Maple's numerical solvers, optimizers and differential equation solving routines.
State-Dependent Properties
State-dependent properties for pure fluids and refrigerants require two states to calculate the value of a property. Valid combinations of states and properties are given in ThermophysicalData,Property, and a list of fluids are given in ThermophysicalData,fluids.
This example yields the specific heat capacity in J-1 kg-1 K-1 of ammonia at temperature 234 K and pressure 101325 Pa.
PropertyC,T=234,P=101325,ammonia
4417.98833355119950
If no unit is specified, the input is assumed to have SI units, and the output is given in SI units. You can also associate units with the states. By default, results are given in the current unit system.
PropertyC,T=234K,P=10psi,ammonia
2230.589948JkgK
You can rescale the result to arbitrary (but dimensionally consistent) units. Just right-click on the result and then select Units Formatting....
0.5331237925Btulb°F
You can also generate PHT charts. Chart properties (for example, the location of the isotherms, pressure ranges, and enthalpy ranges) can be customized.
PHTChartnitrogen
Thermodynamic cycles can be visualized by placing plot objects on these charts. For example, see the Refrigeration Cycle application.
State-Independent Properties
State-independent values only require two arguments - a fluid and a property. This command, for example, finds the critical temperature of water.
PropertyTcrit,water
647.096000000000004
This is the 100-year Global Warming Potential for the refrigerant R134a.
Propertyglobal_warming_potential_100,R134a
1430.
ThemophysicalData,Property has a list of state-independent properties.
Humid Air
You can calculate the properties of humid air. Here we calculate the specific enthalpy of humid air at a user-defined dry-bulb temperature, pressure and relative humidity.
PropertyHha,HumidAir,Tdb=293K,pressure=101325Pa,R=0.45
36209.64301Jkg
You can generate a psychrometric chart, and use it to visualize heating/cooling by overlaying plot objects on it. For example, see the Human Comfort Zone application.
PsychrometricChartpressure=101325Pa
Applications
Heat Flows Across a Refrigeration Cycle
Maximize the Efficiency of a Rankine Cycle
Condition Air into the Human Comfort Zone
Flow of R717 Through an Expansion Valve
Organic Rankine Cycle
Mixing Humid Air
Heat Transfer Coefficient Across a Flat Plate
Energy Required to Vaporize Ethanol
Particle Falling Through Air
Saturation Temperature of Fluids
Download Help Document
