modelExtraTerrestrialIrradiance

Information

1. Purpose of model

Calculates the extraterrestrial irradiance of the sun, equation is given by Duffie/Beckman (2006): Solar Engineering of Thermal Processes

Model provides the angle of incidence and the irradiance of the sun on a horizontal surface at a position with the parameter latitude in respect to local (=solar) time. Solar time and day have to be provided as outer variables.

2. Level of detail, physical effects considered, and physical insight

The model considers the differences of sun-earth distance during a year, neglects periodical differences of sun activity.

3. Limits of validity

until the next big change in sun's activity or if very accurate values are needed

4. Interfaces

(no remarks)

5. Nomenclature

outer variables:

day: day as floating point, means day=0 at 01.01. 00:00:00, day=0.5 at 01.01. 12:00:00 a.s.o.

solarTime: solarTime in seconds

output

sunIrradiance={Irradiance, Angle}: gives the irradiance on a horizontal surface with the incidence angle

6. Governing Equations

7. Remarks for Usage

(no remarks)

8. Validation

(no remarks)

9. References

Duffie/Beckman (2006): Solar Engineering of Thermal Processes

10. Version History

Model created by Tobias Toerber (tobias.toerber@tuhh.de), Jul 2015

Edited by Sascha Guddusch (sascha.guddusch@tuhh.de), May 2016

Modified by Anne Senkel (anne.senkel@tuhh.de), Mar 2017

Modified by Lisa Andresen (andresen@tuhh.de), Apr. 2017

Parameters

Components