external illumination calculations for representative dates (four different
times of day, and one day for each month). These revealed illuminance
levels on the exterior veering from 4500 lux to 83,000 lux on the south
facade of the building, for example, an indication of how important
external light levels are to designing internal illumination.
Secondly, detailed calculations were carried out for the sunniest month,
July, with in-depth analysis of all the exhibits, particularly in regard to
specifying projectors. At this stage, all the floors were modelled separately
and eight different models were produced and calculated. Lastly, annual
daylight calculations were made for all floors, without the exhibits.
We used four types of software to carry out the calculations: Meteonorm,
a catalogue of long-term meteorological data for any location; Rhino
3D for modelling data from the architect; Autodesk 3DS Max to simplify
and render the models and Dialux to make the daylight calculations for
overcast and clear skies. Even with simplification, the analysis called for
a total of 473 calculations together taking almost 4000 hours.
Above: external illuminance was calculated throughout the year and ranged from 2000
lux at the base of the building in December to 83,000 lux at its top in July. However, the
biggest challenge lay in the design of the structure itself