Natural Light in DesignNatural Light in Design · 173 Design Practitioners (over 80% using LEED)...
Transcript of Natural Light in DesignNatural Light in Design · 173 Design Practitioners (over 80% using LEED)...
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Natural Light in DesignNatural Light in DesignUsing simulation tools to explore realistic daylight-responsive solutionsUsing simulation tools to explore realistic daylight-responsive solutions
Christoph Reinhart, Ph.D.Christoph Reinhart, Ph.D.Static Daylighting MetricsStatic Daylighting Metrics
Daylight Factor Visual Comfort
Daylight Autonomy Avoidance of Direct Sunlight
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Overview – Static Daylighting Metrics
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Objectives for this module
• Discuss daylighting design intentions
• Introduce some daylight performance metrics
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What is good daylighting?
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Context I
LEED and Green Globe provide daylight credits for:
daylight factor
view to the outside
specification of shading devices (Green Globe only)
Compliance is verified via spreadsheet method.
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Context II- What is Daylighting?173 Design Practitioners (over 80% using LEED) choose
0Architectural Building energy
consumptionLoad
managementCostLighting
energy savings
10
20
30
40
Which of the Following Definitions for Daylighting is the Most Relevant to you?
50
Engineers & Energy ConsultantsDesigners (Lighting Designers, Architects, Interior Designers)
Figure by MIT OCW.
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Context III- What is Daylighting?Architectural definition: the interplay of natural light and building form to provide a visually stimulating, healthful, and productive interior environmentLighting Energy Savings definition: the replacement of indoor electric illumination needs by daylight, resulting in reduced annual energy consumption for lightingBuilding Energy Consumption definition: the use of fenestration systems and responsive electric lighting controls to reduce overall building energyrequirements (heating, cooling, lighting) Load Management definition: dynamic control of fenestration and lighting to manage and control building peak electric demand and load shape
Cost definition: the use of daylighting strategies to minimize operating costs and maximize output, sales, or productivity
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Do daylight factor & view LEED to good daylighting?
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Daylight Factor DefinitionDF = (E point/E outside horizontal) * 100%
The DF is only defined under overcast skies!
E outside horizontal
E point
Figure by MIT OCW.
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Historical Background: “Right of Light”
Waldram 1945Waldram 1945
UK Prescription Act (1832): If one has benefited from daylight access across some else's property for over 20 years, an absolute and indefeasible ‘rights to light’ is granted to the building.
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Daylight Factor Use in Design
Pro:intuitive quantityovercast sky as a worst case scenariovenetian blinds (even if closed) still admit sufficient DL
7%
3,5%
0%
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Daylight Factor – design implications Iwindow head height ⟨reference
glazing type ⟨ narrow floor plan ⟨
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Daylight Factor – design implications IIThe daylight factor optimized building is fully glazed.
Note, there are LEED certified buildings that are fully glazed!
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Avoidance of Direct Sunlightoptimized for static shading devicelouvers, lightshelves etc. ⟨
Resulting building design form good from an energy standpoint.