Sun Angles Impact the amount of Insolation Daylight Hours Seasonal Seasonal October – March...
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Transcript of Sun Angles Impact the amount of Insolation Daylight Hours Seasonal Seasonal October – March...
Sun AnglesSun Angles
Impact the amount of Impact the amount of InsolationInsolation
Daylight HoursDaylight Hours SeasonalSeasonal October – MarchOctober – March
• Low – SunLow – Sun April – SeptemberApril – September
• High - SunHigh - Sun
Solar declinationSolar declination Latitude where sun is Latitude where sun is
directly overhead (90directly overhead (90°)°)• Sub Solar PointSub Solar Point
Zenith AngleZenith Angle Angle between 90° Angle between 90°
and sun at noonand sun at noon Sun AngleSun Angle
Angle of the sun Angle of the sun above the horizon at above the horizon at noonnoon
Sun AnglesSun Angles
Zenith Angle + Sun Zenith Angle + Sun Angle = 90Angle = 90°°
SOSO What is Tuscaloosa’s What is Tuscaloosa’s
noon sun angle on noon sun angle on June 21June 21stst??
Let’s practiceLet’s practice
Step 1Step 1 Determine declination Determine declination
of sun for that dateof sun for that date
Step 2Step 2 Find noon sun angleFind noon sun angle
• Difference in Difference in °° between between location’s latitude and location’s latitude and SS point then subtract SS point then subtract from 90from 90
The The AnalemmaAnalemma
Daylight HoursDaylight Hours How does sun angle How does sun angle
impact the amount of impact the amount of daylight hours at daylight hours at different latitudes?different latitudes?
Online calculatorOnline calculator
Solar IntensitySolar Intensity
Intensity = Sin (A)Intensity = Sin (A) Sin = sineSin = sine A = sun angleA = sun angle
90 = 100% efficiency90 = 100% efficiency 80 = 98%80 = 98%
45 = 71%45 = 71% 20 = 34%20 = 34%
Run AppletRun Applet
Insolation by LatitudeInsolation by Latitude
NET RADIATIONNET RADIATION