**Hypothesis and equations**

Function computing solar fractions (**SF**) following the methodology described in appendix of the BESTEST procedure.

The computation is based on walls and windows short-wave absorptance and transmittance, on surface areas and form factors between each wall and the floor, on which the first reflection is considered. The approach is as follows:

- Radiation transmitted by the glazing reaches the floor on which a share is absorbed
- The other share is reflected and considered as diffuse. It is distributed on other surfaces proportionally to the term : absorptance x FF with the floor
- The remaining non-absorbed radiation is then distributed on all surfaces proportionally to the term : absorptance x surface areas
- The rest is distributed in proportion to what has been distributed at the previous step.

Note: This model takes into account what is lost through the windows and sent out of the zone./p>

**Bibliography**

none

**Instructions for use**

none

**Known limits / Use precautions**

none

**Validations**

Validated model (BESTEST) - AurĂ©lie Kaemmerlen 09/2010

**--------------------------------------------------------------
Licensed by EDF under a 3-clause BSD-license
Copyright © EDF 2009 - 2023
BuildSysPro version 3.6.0
Author : AurĂ©lie KAEMMERLEN, EDF (2010)
--------------------------------------------------------------**

function BESTESTSolarDistrib input Integer np "Number of walls"; input Integer nf "Number of windows"; input Real Sp[np] "Walls surface areas"; input Real Sf[nf] "Windows surface areas"; input Real AbsP "Short-wave diffuse absorptance of walls"; input Real AbsF "Short-wave diffuse absorptance of windows"; input Real TrF "Short-wave diffuse transmittance of windows"; input Real FFp[np] "Form factor between walls and floor for the computation of the first reflection / BESTEST : 1-ceiling, 2-floor, 3-North, 4-South, 5-East, 6-West"; input Real FFf[nf] "Form factor between windows and floor for the computation of the first reflection"; output Real[np] SFp "Solar fractions of walls / BESTEST : 1-ceiling, 2-floor, 3-North, 4-South, 5-East, 6-West"; output Real[nf] SFf "Solar fractions of windows/ BESTEST : 1-South OR 1-East, 2-West"; end BESTESTSolarDistrib;

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