Here Comes the Sun Environmental Tech III ARCH4225 Fall 2011 - Prof. Tango.
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Transcript of Here Comes the Sun Environmental Tech III ARCH4225 Fall 2011 - Prof. Tango.
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Here Comes the SunEnvironmental Tech III ARCH4225 Fall 2011 - Prof. Tango
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Earth / Sun Applet
• Understand the principles governing the relationship between the earth’s rotation, orbit and angle to the sun
http://www.mesoscale.iastate.edu/agron206/animations/01_EarthSun.html
• Arctic circle 66.5 degrees north latitude• Tropic of Cancer = 23.5 degrees north• Tropic of Capricorn = 23.5 degrees south• Antarctic Circle = 66.5 degrees south latitude
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Winter SolsticeDec. 21(Northern Hemisphere)
Summer SolsticeJune. 21(Northern Hemisphere)
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Changes in Latitude, Change in Altitude
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Solar Control and Shading Devices/Olgyay, pg 38
Sun Path DiagramFor 32 degrees north latitude
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Heliodon
Seven Rings for the months:
June 21 - Summer SolsticeJuly 21 / May 21Aug. 21 / April 21Sept. 21 / March 21- EquinoxOct. 21 / Feb. 21Nov. 21 / Jan. 21Dec. 21 - Winter Solstice
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Sun Chart and Shadow Casting
• straightedge
• scale
• protractor
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Reading the Sun Path Diagram
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9AM1PM5PM
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9AM1PM5PM
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9AM1PM5PM
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9AM1PM5PM
SUMMER EQUINOX WINTER
LATITUDE:
ALTITUDE AZIMUTH ALTITUDE AZIMUTH ALTITUDE AZIMUTH
9 AM
1 PM
5 PM
Project sun rays into the room plan located in Atlanta, GA (33 degree north latitude) at 9AM, 1PM & 5PM for Summer Solstice, Equinox and Winter Solstice. Use different colors for each time. Use multiple sheets to draw a total of nine sun ray tracings.
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Solar TimeSolar time varies from clock timeReasons:1.Daylight Savings TimeTypically clocks are adjusted forward one hour near the start of spring (2nd Sunday in March/spring forward) and are adjusted backward in fall (1st Sunday in November/fall back)2.Deviation in longitude3.Earth’ s speed in it’s orbit around sun changes during the year
Feb. 11 (+14 minutes) Nov. 1 (- 16 minutes)
33 degrees North Latitude
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GMT-5 hours-6-7-8 +2 +3 +4 hoursU S A
World Time Zones direction of earth’s rotation ----- Standard time meridians are 15 degrees apart (one hour) or 4 minutes per degree
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Solar Control and Shading Devices / Olgyay & OlgyayBioclimatic Considerations, page 19-23Shading Masks, page 44-49Sun Path Diagrams, page 84-85Overheated period charts, page 86-87Vocabulary of Shading Devices, page 88-92Architectural Examples (Case Studies), page 93-199
\\Fac_web\web\architecture\classes ARCH 4225 Fall 2011 Prof. Tango
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7 – 8 week typical time lag between summer solstice andpeak heat period.
This is because of the gradual warming of the earth over the summer period
June 21 – Summer Solstice
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Obstruction Masks
• Moore – Concepts and Practice of Architectural Daylighting page 72 -78
• Olgyay - Solar Control and Shading Devices– pages 44-49 (Part II) Obstruction Mask Concept– pages 88-92 (Part III) Obstruction Mask Examples
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Obstruction Mask
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Olgyay page 45
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Olgyay page 45
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smiles and pies
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Horizontal Shading Device@ 100% shading
Concepts and Practice of Architectural Daylighting / Fuller Moore page 72 -78
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Horizontal Shading Device@ 50% shading
Concepts and Practice of Architectural Daylighting / Fuller Moore page 72 -78
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Concepts and Practice of Architectural Daylighting / Fuller Moore page 72 -78
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Shadow masks
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Moore: Concepts and Practice of Architectural Daylighting – page 74 - 75
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• Daylight Factor
• Footcandles
• Model Testing
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Custom model solar alignment to 4PM on December 21 using sun dial chart.Photometric data being recorded for graphic analysis by 4th year students Landon Ray, Sudha Somayajula and Kellen Spafford.
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Tuesday Sept. 6, 2011
• Tuesday Sept. 6. Daylighting / Shading Exercises, Test Review.
• Thursday Sept. 8. Day/Sim Demo.
• Tuesday Sept. 13GlassBuild Field Trip
• Thursday Sept. 15Test 1: Shading / Daylighting
• Tuesday Sept. 20 Daylighting Project Work Day
• Thursday Sept. 22 Daylighting Project Due
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Shading Exercises
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Test 1 Study OutlineEnvironmental Tech III - Prof. TangoThursday Sept. 15 4-6:15 Solar Pattern
AzimuthAltitudeTropic of Cancer/CapricornArctic CircleTilt of earthSunpath diagramsSolar time vs. actual time
DSTLongitudeOrbit
Solar year vs. thermal yearOverheated periodUnderheated periodComfort Zone
Creating a sunpath/temperature chartShadow Masks
Smiles and PiesCreating a shadow mask
Daylighting
Daylight FactorFootcandles