delight daylight energy · delight daylight energy kevin g. van den wyelenberg, phd university of...

Delight Daylight Energy

Kevin G. Van Den Wyelenberg, PhD

University of Idaho – Integrated Design Lab [email protected]

Environmental Services Building The Miller Hull Partnership

Terry and Thomas Building, Weber+Thompson

Design EUI :48 kbtu/sf-yr Measured: 41 kbtu/sf-yr Installed LPD: 0.6 w/sf Measured LPD: 0.26 w/sf High Occupant Satisfaction

Daylight Pattern Guide!

107 EDUCATION DAYLIGHTING TOUR!

2013-14!

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http://patternguide.advancedbuildings.net/home



2013-14!


Patterns and Search Page Table of Contents and Sort Field Thumbnail images and pattern and sub-pattern descriptions for all or sorted pattern contents.



2013-14!


Pattern Title Indicates the pattern title and number. Pattern Overview Filmstrip Overview Indicates the geometric or temporal variations explored in each pattern and the position of each simulation case within the larger pattern sequence. Pattern Overview Narrative Provides overarching design considerations inherent with each daylighting challenge. HDR Actual Photo High dynamic range photograph of the physical space

Pattern Overview Page



2013-14!


Typical Pattern Page Layout and Common Elements

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Laboratory Environment Daylight Harvesting Lighting Energy Savings •  45-55 % potential lighting savings from three years worth of illumination data (Littlefair, 2001)

•  60% lighting savings for a dimming system with automated blinds (Roche, 2002) •  20-23% lighting savings with windows from one side (Lee and Selkowitz, 2006)

•  52-59% with windows on two sides (Lee and Selkowitz, 2006)

Field Study Daylight Harvesting Lighting Energy Savings •  <0% to 156% of predicted savings

•  (Pigg et al. 1996; Jennings et al. 1999; Reinhart & Voss 2003; Moore et al. 2003; McHugh et al. 2004; Heschong et al. 2005; Hackel & Schuetter 2013; Galasiu et al. 2007; Fernandes et al. 2014)

•  Savings from Toplit spaces more predictable than sidelit •  (Heschong et al. 2005; McHugh et al. 2004)

•  Recent studies show improvement •  (Acker & Van Den Wymelenberg 2010; Fernandes et al. 2014)

•  but!.problems persist (50% realization) •  (Hackel & Schuetter 2013)

IES LM-83-12 !Approved Method:!IES Spatial Daylight Autonomy (sDA) and Annual Sunlight Exposure (ASE)!

PUBLICATIONS!


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INTRODUCTION 5

temperature extremes, ranging from –48 to 119°F, makes “mild” a

misnomer at times. Northwest weather and climate are dominated

by two main elements: (1) the vast Pacific Ocean to the west and (2)

the region’s mountain ranges that block and deflect low-level air.3

In the Pacific Northwest, as the jet stream pushes air from the west

inland to the east, clouds form on the western slopes of major mountains,

including the Cascade Range, and clearing occurs to the east. Long-term

weather data indicate that Seattle and Portland, both west of the Cascades,

are overcast nearly 230 days per year, but the inland cities of Spokane,

Washington, and Boise, Idaho, are overcast only 191 and 155 days per year

on average respectively. Overlaid on the contrasting character of areas west

and east of the Cascades is a distinct seasonal shift between cloudy winter

months to a dominantly clear sky period between July and October—this

pattern is most apparent west of the Cascades. The annual periodicity of

overcast and sun, caused by shifts in the jet stream over the Pacific Ocean,

combines with mild year-round ocean temperatures to amplify precipitation

in winter and inhibit it during the summer months.4

The physical and visual experiences of climate in the inland Pacific North-

west are different from those in the maritime coastal areas. Consequently,

each subregion’s daylight has its own characteristics. A common experience

east of the Cascades is the golden glow of low-angle late summer sun that

reaches across burned sagebrush-cloaked foothills and paints the ridges light

umber and the valleys dark umber during the early morning and late after-

noon and a vibrant gold at midday. In contrast, the forested coastal regions

of the maritime Northwest are defined largely by the inverted topography

of cloud cover. Here, mild temperatures predominate, and steely silver-gray

Cloudscape. Photo: Mary Randlett, Cloud Form

#1, September 1998. Courtesy Special Collec-

tions, University of Washington

INTRODUCTION 5

temperature extremes, ranging from –48 to 119°F, makes “mild” a

misnomer at times. Northwest weather and climate are dominated

by two main elements: (1) the vast Pacific Ocean to the west and (2)

the region’s mountain ranges that block and deflect low-level air.3

In the Pacific Northwest, as the jet stream pushes air from the west

inland to the east, clouds form on the western slopes of major mountains,

including the Cascade Range, and clearing occurs to the east. Long-term

weather data indicate that Seattle and Portland, both west of the Cascades,

are overcast nearly 230 days per year, but the inland cities of Spokane,

Washington, and Boise, Idaho, are overcast only 191 and 155 days per year

on average respectively. Overlaid on the contrasting character of areas west

and east of the Cascades is a distinct seasonal shift between cloudy winter

months to a dominantly clear sky period between July and October—this

pattern is most apparent west of the Cascades. The annual periodicity of

overcast and sun, caused by shifts in the jet stream over the Pacific Ocean,

combines with mild year-round ocean temperatures to amplify precipitation

in winter and inhibit it during the summer months.4

The physical and visual experiences of climate in the inland Pacific North-

west are different from those in the maritime coastal areas. Consequently,

each subregion’s daylight has its own characteristics. A common experience

east of the Cascades is the golden glow of low-angle late summer sun that

reaches across burned sagebrush-cloaked foothills and paints the ridges light

umber and the valleys dark umber during the early morning and late after-

noon and a vibrant gold at midday. In contrast, the forested coastal regions

of the maritime Northwest are defined largely by the inverted topography

of cloud cover. Here, mild temperatures predominate, and steely silver-gray

Cloudscape. Photo: Mary Randlett, Cloud Form

#1, September 1998. Courtesy Special Collec-

tions, University of Washington

?

Kevin Van Den Wymelenberg, PhD, IES [email protected] !208.401.0641!

Delight Daylight Energy

Kevin G. Van Den Wyelenberg, PhD

University of Idaho – Integrated Design Lab [email protected]

delight daylight energy · delight daylight energy kevin g. van den wyelenberg, phd university of...

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