NCEUB Conferences, 13th International Radiance Workshop 2014

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More light, fewer emissions: daylight and carbon savings, from room to masterplan
Reinier Zeldenrust

Building: Arup 8 Fitzroy St.
Room: Emmerson & Shears Room
Date: 2014-09-03 02:00 PM – 02:30 PM
Last modified: 2014-08-24


Optimising a design for daylight is a worthwhile process. However, daylight does not exist in isolation: there is often a trade-off with energy performance, cost, design flexibility & floor area maximisation.

For a specific room or building these trade-offs are relatively simple and specific guidance can be given:

  • For a classroom, we optimised the location of a wall, and size of a rooflight to achieve the minimum daylight required for benchmarking.
  • For a factory, we calculated the shape of and the maximum spacing between roof lights to achieve a desired useful daylight index at minimum cost.

On the scale of a masterplan, with only general massing in place, specific guidance cannot be given. While this phase is uncertain, it also gives a lot of freedom to push the design forward. Using a combination of tools, we created a database of simulations that provided multiple options that would meet the performance targets for different typologies and orientations. Members of the design team can then use this tool to weigh their own trade-offs and to design a well-performing building according to their own priorities.