Environmental Controls I/IG

Environmental Controls I/IGEnvironmental Controls I/IG

Lecture 18Lecture 18Daylighting Design & AnalysisDaylighting Design & Analysis

Design StrategiesDesign Strategies

Glazing and ReflectorsGlazing and Reflectors

Sidelighting Analysis MethodSidelighting Analysis Method

Lecture 18Lecture 18Daylighting Design & AnalysisDaylighting Design & Analysis

Design StrategiesDesign Strategies

Glazing and ReflectorsGlazing and Reflectors

Sidelighting Analysis MethodSidelighting Analysis Method

Daylighting Daylighting Design & AnalysisDesign & Analysis

Orientation and SlopeOrientation and Slope

Vertical vs. Horizontal Time of yearSun position

DL-5 F. 10-1 p. 79

Daylighting ComponentsDaylighting Components

SC=Sun + SkyIRC1

IRC2ERC

S: F.14.18 p. 590

Daylighting Factor (DF)Daylighting Factor (DF)

The quantity of interior illuminance on a horizontal work plane expressed as a percentage of illuminance of an exterior unobstructed horizontal plane

DF (%) = (EINT/EEXT) x 100

Daylighting Factor (DF)Daylighting Factor (DF)

If EINT is 20 foot-candles

and EEXT is 1000 foot-candles,

then what is the daylighting factor?

DF(%)= (EINT/EEXT) x 100

DF (%)=(20/1000) x 100DF (%)=2.0%

Isolux ContoursIsolux Contours Lines of similar

lighting levels Expressed as DF

Darwin College Library, Cambridge, England

Isolux Contours ExampleIsolux Contours ExampleEEXT= 2000 fc

1: 20 fc2: 60 fc3: 100 fc4: 40 fc5: 80 fc6: 140 fc7: 20 fc8: 60 fc9: 100 fc

1+ 2+ 3+

4+ 5+ 6+

7+ 8+ 9+

DF(%)= (EINT/EEXT) x 100

Isolux Contours ExampleIsolux Contours ExampleEEXT= 2000 fc

1: 20 fc DF=1 %2: 60 fc DF=3 %3: 100 fc DF=5 %4: 40 fc DF=2 %5: 80 fc DF=4 %6: 140 fc DF=7 %7: 20 fc DF=1 %8: 60 fc DF=3 %9: 100 fc DF=5 %

1+ 2+ 3+

4+ 5+ 6+

7+ 8+ 9+

Isolux Contours ExampleIsolux Contours ExampleEEXT= 2000 fc

1: 20 fc DF=1 %2: 60 fc DF=3 %3: 100 fc DF=5 %4: 40 fc DF=2 %5: 80 fc DF=4 %6: 140 fc DF=7 %7: 20 fc DF=1 %8: 60 fc DF=3 %9: 100 fc DF=5 %

1 3 5

2 4 7

1 3 56

42

Isolux ContoursIsolux Contours Lines of similar

lighting levels Expressed as DF

Darwin College Library, Cambridge, England

Illumination Illumination GradientGradient

An illumination gradient through a section

Ludwig Museum, Koln, Germany

Design StrategiesDesign Strategies

Selection ParametersSelection Parameters

Daylight availabilityTask orientationSpace orientation

Daylighting GraphsDaylighting Graphs

10’ Ceiling30” Work plane

DL-5: F10-2 p. 80

South Facing WallsSouth Facing WallsSolid Overhang

a: translucent glazingb: horizontal overhangc: 30º sloped clear

glazingd: 45º sloped clear

glazing

DL-5: F10-5 p. 82

South Facing WallsSouth Facing WallsDiffusing Awnings

a: translucent glazingb: translucent awning

clear glazingc: white vertical

slatted awning, clear glazing

d: white, horizontal slatted awning, clear glazing

DL-5: F10-6 p. 82

Light ShelvesLight Shelves

W: With light shelfWO: Without light shelf

DL-5: F10-18 p. 89

Skylights Skylights

Effect of skylight above roofa: flat horizontalb: half-round barrel, white opaque endsc: steeply sloped A-frame, white opaque ends

DL-5: F10-21 p. 91Typographic Error In Reading

Roof Monitors Roof Monitors

North-South Monitors

a: translucent panelb: north monitor,

clear glazingc: south monitor,

translucent glazing

DL-5: F10-30 p. 95

Roof Monitors Roof Monitors

Sun Control

Baffles/LouversLight Wells

DL-5: F10-35 p. 97

Roof Monitors Roof Monitors

Graphic Design Approach

DL-5: F10-37 p. 98

Glazing & ReflectorsGlazing & Reflectors

Fenestration Fenestration

Window or Fenestration?

Clear Glazing Clear Glazing

Maximum VLT

DL-5: F11-1 p. 105

Gray/Bronze Gray/Bronze Glazing Glazing

Gray glass preferred where color rendition is important

DL-5: F11-2 p. 106

Heat Absorbing Heat Absorbing Glazing Glazing

Green is more common

Blue is becoming moreavailable

DL-5: F11-3 p. 107

Solar IR Solar IR Reflective Film Reflective Film

Low-E Glass

DL-5: F 11-6 p. 109

Multiple Glazing Multiple Glazing

Combinations of individual paned glazing

Mylar/Film layer Inert gas (argon or

krypton) “Superwindow”

Exotics Exotics

LED Windows Aerogels Kalwall

Prototype House and StudioThomas Herzog