## Information

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:

1. Radiation transmitted by the glazing reaches the floor on which a share is absorbed
2. 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
3. The remaining non-absorbed radiation is then distributed on all surfaces proportionally to the term : absorptance x surface areas
4. 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

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BuildSysPro version 3.6.0
Author : AurĂ©lie KAEMMERLEN, EDF (2010)
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#### Interface

```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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