Computer calculation of thermodynamic properties is an efficient replacement for propertytables, which are still used in thermodynamics instruction. Computerized property calculationsare used routinely in engineering applications. They are available from a variety of sources, suchas the National Institute of Standards and Technology. 1
Computer property calculations are a part of current thermodynamics texts. The book by Çengeland Boles 2 includes an academic version of the Engineering Equation Solver (EES) that allowsstudents to formulate thermodynamic problems as a set of equations that may involvethermodynamic property calculations. EES is then able to solve a properly posed problem. Itcan also be used for finding an individual property at a single state. The texts by Sonntag et al. 3and Moran and Shapiro 4 include programs that can find state properties or generate tables.
Engineering Equation Solver EES Cengel Thermo Iso
In this equation P is the pressure, v is the specific volume, T is the absolute temperature, R is theengineering gas constant, and b is a coefficient that is zero in most equations. The first term inthis equation, with b = 0, is simply the ideal gas law. The remaining terms mark a deviationfrom the ideal gas law. In the summation, Ci(T) is a function of temperature only and Hi(v) is afunction of specific volume only. Although equation [3] gives the pressure as a function oftemperature and specific volume, most equations of state use density instead of specific volume.Regardless of the equation of state, specific volume is the variable specified by and output to the 2ff7e9595c
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