Daylighting Modeling and Analysis - Stanford...
Transcript of Daylighting Modeling and Analysis - Stanford...
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Daylighting Modeling and Analysis
Benjamin Welle, P.E., C.E.M., LEED APPhD Student, CIFECEE Department
Stanford University
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What we will talk about today…
Daylighting Basics
Summary of Modeling Inputs
Radiosity vs. Ray Tracing
Summary of Modeling Outputs
Daylighting Metrics
Overview of Daylighting Tools
Some Pretty Pictures
Daylighting in SPOT, DAYSIM, and IES
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Daylighting…what is it?
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Daylighting…why do we care?
Aesthetic valueHealth valueEconomic valueFunctional valueThermal valueIt’s just plain cool
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Solar Position
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Variations in Incident Solar
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Seasonal Angles
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Diffuse and Direct Components
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Diffuse Sky Conditions
LIGHTING/DAYLIGHTING ANALYSIS: A COMPARISONHarvey Bryan, Ph.D., FAIASayyed Mohammed Autif
http://www.learn.londonmet.ac.uk/packages/clear/visual/daylight/sun_sky/sky_types.html
Clear sky Intermediate sky Overcast sky Uniform sky
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Daily Solar Radiation
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Surface Properties
Diffuse Specular
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Glazing Types
http://www.efficientwindows.org/index.cfm
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Spectrally Selective Glazing
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What is Illuminance?• Amount of light striking a point on a surface. [units: footcandle, lux (luminous flux per unit area ex: lumen per SF)]
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Illuminance =Lumens/ft2
Illuminance: the number of lumens falling in each square foot of a surface.
Illuminance (cont’d)
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What is Luminance?
• Luminance, the amount of light reflected by a surface in a specific direction. [units: luminous intensity per area, ex. candelas/ SF]
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Illuminance vs. Luminance
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Light Output
Luminous Flux
LuminousIntensity
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Lumens (Amount of Light)
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Brightness (Intensity of Light)
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Illuminance (Light Arriving at a Surface)
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Lighting Units
Measure Unit
Luminous Flux Lumen
Illuminance Footcandle = lumen / ft 2
Luminous Intensity Candela
Luminance Candela / unit area
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Physical Daylighting Models
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Illuminance Measurements
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Advantages of using a computer…
Easy Changes (modifiable).
Internal or external obstructions can be handled easily.
Material and glazing properties.
Controlled weather conditions.
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Basic Daylight Model Inputs
Solar resource (location, date, weather)
Geometry (interior and exterior)
Building orientation
Surface properties (reflectances, specularity)
Glazing properties
Solar control strategies
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Radiosity vs. Ray Tracing
Radiosity Backward Ray Tracing
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http://ocw.mit.edu/NR/rdonlyres/Electrical-Engineering-and-Computer-Science/6-837Fall2003/69B1A6C4-511C-4CEE-8351-ED5B318FD940/0/19_montecarlo.pdf
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Ray Tracing
• Handles specular reflections very well• Best for rendering applications
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Summary of Modeling Outputs
Illuminance levels
Illuminance distribution
Luminance ratios
Glare probability
Direct light penetration
Performance metrics
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Daylighting Metrics‐Daylight Factor (static)
Ratio of the illuminance on the given plane at that point to the simultaneous exterior illuminance on a horizontal plane from the whole of an unobstructed sky.
Daylight Factor (DF) = Sky + Reflected External + Reflected Internal
Assumes an overcast sky for worse case conditions
Most commonly used metric in daylighting design
It is a poor metric for it does not take into account orientation, clear‐sky days, and operating schedule
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Daylighting Metrics‐Daylight Factor (dynamic)
Daylight Autonomy (DA): the percentage of the year when a minimum illuminance threshold is met by daylight alone.
Useful Daylight Illuminances (UDI): UDI results in three metrics: the percentages of the occupied times of the year when the UDI was achieved (100-2000lux), fell-short (<100 lux), or was exceeded (> 2000 lux).
Continuous Daylight Autonomy (DAcon): like DA, but partial credit is attributed to time steps when the daylight illuminance lies below the minimum illuminance level. For example, in the case where 500 lux are required and 400 lux are provided by daylight at a given time step, a partial credit of 400lux/500lux=0.8 is given for that time step.
Dynamic metrics are more useful for daylighting design for they account for operating schedule, varying sky conditions, and orientation
Dynamic Daylight Performance Metrics for Sustainable Building DesignChristoph F. Reinhart, John Mardaljevic, Zack Rogers
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Daylighting Simulation Software
Software Information Cost Comments
SPOT http://www.archenergy.com/SPOT FreeGUI to Radiance, Excel based, easy to use, dynamic
SkyCalchttp://www.energydesignresources.com/tools/skyclac.html Free Excel based, used for skylights
SuperLite http://eetd.lbl.gov/btp/superlite20.html Free Radiosity, not used much
Trace-Pro http://www.lambdares.com/ $12,000 Good integration with CAD and CATIA but $$$$$
Lumen Micro http://www.lighting‐technologies.com/ $595 Radiosity, popular
ECOTECT http://www.squ1.com/ $90 Student License
DF calcs only, limited capabilities, exports to DAYSIM and Radiance
Radiance http://radsite.lbl.gov/deskrad/ FreeWidely used simulation engine, no GUI, has both ray tracing and radiosity
Desktop Radiance http://radsite.lbl.gov/deskrad/ Free Not really functional at this time, old
Rayfront http://www.schorsch.com/rayfront/ $895 Website has been down all year
AGi32 http://www.agi32.com/ Free for us! Radiosity, limited ray‐tracing, very popular
DAYSIMhttp://irc.nrc‐cnrc.gc.ca/ie/lighting/daylight/daysim_e.html Free
GUI to Radiance, good metrics, easy to use, dynamic
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The pretty pictures you are all waiting for….
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Radiance Modeling
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Radiance Modeling
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Radiance Modeling
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Radiance Modeling
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Radiance Modeling
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Radiance Simulation
False Color Luminance Plot
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Interior Luminous Environment
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• Electric Lighting Analysis
• Annual Daylighting Analysis
• Photosensor Placement Optimization
• Photosensor System Optimization
• Annual System Performance Analysis
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SPOT Modeling Process
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SPOT‐ Geometric Input
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SPOT‐ Daylighting Results
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DAYSIM‐ Geometry Import
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DAYSIM‐ Simulation Parameters
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DAYSIM‐ Define Building Info
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DAYSIM‐ Simulation Report
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DAYSIM‐ Simulation Parameters (cont’d)
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IES‐ Radiance
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IES‐ Sky and Eye
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IES‐ Surface Properties
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IES ‐ Luminance Exterior
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IES‐ Illuminance
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IES‐ Illuminance Contours
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IES‐ Glare Analysis
![Page 59: Daylighting Modeling and Analysis - Stanford Universityweb.stanford.edu/class/cee111/Daylighting.pdf · Daylighting Modeling and Analysis Benjamin Welle, P.E., C.E.M., LEED AP PhD](https://reader034.fdocuments.net/reader034/viewer/2022051522/5a71db957f8b9aa2538d3175/html5/thumbnails/59.jpg)
IES‐ Sun Path Diagrams
![Page 60: Daylighting Modeling and Analysis - Stanford Universityweb.stanford.edu/class/cee111/Daylighting.pdf · Daylighting Modeling and Analysis Benjamin Welle, P.E., C.E.M., LEED AP PhD](https://reader034.fdocuments.net/reader034/viewer/2022051522/5a71db957f8b9aa2538d3175/html5/thumbnails/60.jpg)
IES‐ Shading Study
![Page 61: Daylighting Modeling and Analysis - Stanford Universityweb.stanford.edu/class/cee111/Daylighting.pdf · Daylighting Modeling and Analysis Benjamin Welle, P.E., C.E.M., LEED AP PhD](https://reader034.fdocuments.net/reader034/viewer/2022051522/5a71db957f8b9aa2538d3175/html5/thumbnails/61.jpg)
Questions?