here comes the sun environmental tech iii arch4225 fall 2011 - prof. tango

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