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GPS-X Technical Reference

GPS-X Technical Reference

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Suspended Growth Models 118<br />

Physical Constants Sub-Section<br />

Molecular weight of air (@ U.S. Standard Conditions): Specifies the molecular<br />

weight of air at U.S. Standard Conditions which is used in Equation 6.5 to calculate the<br />

barometric pressure at the elevation and air temperature specified. <strong>GPS</strong>-X does its<br />

internal calculations in U.S. Standard Conditions.<br />

Gas constant: Specifies the value of the universal gas constant.<br />

Antoine coefficient A1: Coefficient A in the Antoine equation which is used to calculate<br />

the vapour pressure of water at a given water temperature.<br />

Antoine coefficient A2: Coefficient B in the Antoine equation which is used to calculate<br />

the vapour pressure of water at a given water temperature.<br />

Antoine coefficient A3: Coefficient C in the Antoine equation which is used to calculate<br />

the vapour pressure of water at a given water temperature.<br />

Properties of User-Defined Air Sub-Section<br />

The parameters in this sub-section of the layout-wide physical form are duplicates of the<br />

local versions discussed earlier.<br />

SOTE Regression Coefficients Sub-Section<br />

In this sub-section, the user can specify the regression coefficients used in the available<br />

SOTE correlations.<br />

<strong>GPS</strong>-X <strong>Technical</strong> <strong>Reference</strong>

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