Abstract
A new set of MATLAB based functions have been written for providing fluid property data and solving thermodynamics problems. One function utilizes NIST property tables for pure real fluids (e.g. water, various refrigerants, propane, etc.), and provides desired properties when provided with any two other independent properties. Properties can be obtained for liquids, vapors, and two-phase mixtures. Another function provides properties for a range of pure ideal gases using NASA functions for specific heats. Enthalpies are referenced to include the heat of formation, so the function is useful for solving combustion problems. A third function utilizes the ideal gas function to provide ideal gas properties for dry air, assuming a mixture of 78% N2, 21% O2, and 1% Ar by volume. A fourth function uses the air and real fluid functions to provide properties for moist air. Additional functions are available to generate property plots. All functions can be used with the SI or the U.S. Customary unit systems. The functions are described, and examples are provided in which they are used to solve thermodynamics problems. When used in conjunction with built-in MATLAB commands, the new functions are useful for parametric and optimization studies. The full package, including function codes and data files, requires 2.5 MB of disk space and is available at no cost.
