BuildSysPro.BoundaryConditions.Solar.Utilities.TimeEquationClim2000

# .BuildSysPro.BoundaryConditions.Solar.Utilities.TimeEquationClim2000

Equation of time

## Information

Function computing the equation of time according to (t0 + t) given in seconds using the method from CLIM2000

Hypothesis and equations

The function returns the equation of time according to (t0 + t) given in seconds using the method from CLIM2000:

ET=(0.0002 - 0.4197*cos(wd) + 3.2265*cos(2*wd) + 0.0903*cos(3*wd) + 7.3509*sin(wd) + 9.3912*sin(2*wd) + 0.3361*sin(3*wd))/60.0

Where wd=2*pi/365.25*d et day of the year according to t0+t

The year is supposed to be not bisextile.

Bibliography

H. BOUIA, "Amélioration du temps de calcul dans BuildSysPro par traitements numériques optimisés de la conduction et des calculs solaires", Note H-E14-2013-00715-FR, 03/2013.

Instructions for use

none

Known limits / Use precautions

none

Validations

Validated function - Hassan BOUIA 03/2013.

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Licensed by EDF under a 3-clause BSD-license
Copyright © EDF 2009 - 2023
BuildSysPro version 3.6.0
Author : Hassan BOUIA, EDF (2013)
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#### Interface

>     function TimeEquationClim2000
>       input Real t0 = 0 "Time in seconds at t=0";
>       input Modelica.Units.SI.Time t "Time in seconds";
>       output Real ET "Equation of time (in hour)";
>     end TimeEquationClim2000;

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