Daylighting: Natural Light in Architecture

Indirect/direct louvre with 25 per cent indirect and 75 per cent direct,

this configuration produces high performance with high efficiency.

The artificial lighting was simulated by computer on the assumption
that no natural lighting was available (a night time scenario) allowing for
cleaning and lamp degradation. The results indicate a minimum light
level of 235 Lux with a maximum of 919 Lux with an average of 636 Lux.

Conclusions

It can be concluded that the proposed artificial lighting solution will
produce the correct lighting levels within the office spaces. At the design
development stage an energy consumption figure of 100 Wh/m2/annum
for normal working hours (excluding special energy requirements for
computer suites control room and kitchen equipment).
There is no reason to amend this figure, but its success will depend
upon the control regimes applied by the BEMS. This would no doubt take
into account any savings of energy available due to daylight linking.

EXAMPLE 2

Whilst the first example is an extensive study, leading to a successsful
conclusion in the subsequent built form, where model studies were
compared with computer studies.
The following example is a preliminary study made at an early stage in
the design of a building to check whether the daylight available would be
satisfactory, or whether changes needed to be made to the daylight
strategy.
DPA (Lighting Consultants) were commissioned to investigate the
daylighting for a proposed extension to the Leeds College of Art and
Design, Blenheim Walk Campus, providing new studio space over four
floors. The building is referred to as the ‘New Design and
Communication Building’. The building designed by architects Aedas
Architects Ltd contains large open-plan teaching studios, a studio/theatre

Calculations 55

Computer simulation of a possible artificial

lighting solution

Buro Happold