UNCERTAINTY ANALYSIS OF AN EQUATION OF STATE FOR DRY AIR

摘要

Process measurements of pressure and temperature are often made to calculate thermodynamic properties from an equation of state. While the pressure and temperature measurements are generally accounted for in an uncertainty analysis, the uncertainty associated with the state equation is often unknown. This paper proposes an analysis process for determining the uncertainty of the state equation. The method is applied to the specific case of calculating the density of air. The analysis is expanded to include the effect of correlation, two methods to quantify correlation are proposed. Finally, the uncertainty analysis is expanded to include additional thermodynamic properties.