lec17 - Design Tools Computer simulations Experimental...

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Design Tools ± Computer simulations ± Experimental approaches ± Manual methods
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Simple Design Tools ± Manual methods simple geometries and sky conditions / / f(x) Daylight factor for sidelit rooms Daylight factor for rooflit rooms Window design Rooflight design SUBJECT TYPE Atria design Energetic behaviour daylight autonomy Shadow & reflection analysis sunshine duration Visual comfort A. Formulae & rules of thumb B. Tables C. Nomograms D. Diagrams E. Protractors Figure by MIT OCW.
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Simple Design Tools ± Manual methods Lumen method: E int = E ext x τ x CU ­ exterior illuminance ­ net transmittance ­ coefficients of utilization Æ interior illuminance 0 0 5 10 15 25 35 10 20 30 40 50 60 70 80 90 Solar altitude in degrees Illuminance in kilolux (multiply by 100 for approximate footcandles) Horizontal (half sky) Horizontal (full sky) Ceiling cavity 70 percent reflectance Room cavity 50 percent reflectance H D W Floor cavity 30 percent reflectance 10% D 30% D 50% D 70% D 90% D 1.00 0.90 0.80 0.70 0.60 0.50 0.40 0.35 60 percent well
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