here comes the sun environmental tech iii arch4225 fall 2011 - prof. tango
TRANSCRIPT
Here Comes the SunEnvironmental Tech III ARCH4225 Fall 2011 - Prof. Tango
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
Winter SolsticeDec. 21(Northern Hemisphere)
Summer SolsticeJune. 21(Northern Hemisphere)
Changes in Latitude, Change in Altitude
Solar Control and Shading Devices/Olgyay, pg 38
Sun Path DiagramFor 32 degrees north latitude
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
Sun Chart and Shadow Casting
• straightedge
• scale
• protractor
Reading the Sun Path Diagram
9AM1PM5PM
9AM1PM5PM
9AM1PM5PM
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.
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
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
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
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
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
Obstruction Mask
Olgyay page 45
Olgyay page 45
smiles and pies
Horizontal Shading Device@ 100% shading
Concepts and Practice of Architectural Daylighting / Fuller Moore page 72 -78
Horizontal Shading Device@ 50% shading
Concepts and Practice of Architectural Daylighting / Fuller Moore page 72 -78
Concepts and Practice of Architectural Daylighting / Fuller Moore page 72 -78
Shadow masks
Moore: Concepts and Practice of Architectural Daylighting – page 74 - 75
• Daylight Factor
• Footcandles
• Model Testing
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.
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
Shading Exercises
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