Daylight Availability2 - 1 University of Illinois at...

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Unformatted text preview: 1 University of Illinois at Urbana-Champaign DAYLIGHT AVAILABILITY Architecture 342 Fall 2006 M. Boubekri, Ph. D. Daylight Availability Daylight Availability 1. Correction for Solar Time 2. Sky Conditions 3. Solar Angles 4. Overhangs Design 5. Shadows & Sunlight Penetration 6. Determining Daylight Illuminance University of Illinois at Urbana-Champaign DAYLIGHT AVAILABILITY Architecture 342 Fall 2006 M. Boubekri, Ph. D. Solar Time Solar Time E = 0.165 sin 2B - 0.126 sin cos B 0.025 sin B LST = Local Solar time (decimal hrs 0-24) CT = Clock Time (decimal hrs 0-24) L std = St. meridian for the local time zone (degrees west) L loc = longitude of actual location (degrees west) E = Equation of time (hrs) DT = Daylight savings Time correction (DT = 0 if not DST) LST = CT + ( ) (L std L loc ) + E + DT 15 1 Correction for Solar Time 2 University of Illinois at Urbana-Champaign DAYLIGHT AVAILABILITY Architecture 342 Fall 2006 M. Boubekri, Ph. D. Solar Time Solar Time LST = Local Solar time (decimal hrs) CT = Clock Time (decimal hrs) L std = St. meridian for the local time zone (degrees west) L loc = longitude of actual location (degrees west) E = Equation of time (hrs) DT = Daylight savings Time correction (DT = 0 if not DST) LST = CT + ( ) (L std L loc ) + E + DT 15 1 Correction for Solar Time University of Illinois at Urbana-Champaign DAYLIGHT AVAILABILITY Architecture 342 Fall 2006 M. Boubekri, Ph. D. Solar Time Solar Time LST = CT + ( ) (L std L loc ) + E + DT 15 1 3 University of Illinois at Urbana-Champaign DAYLIGHT AVAILABILITY Architecture 342 Fall 2006 M. Boubekri, Ph. D. Solar Time Solar Time LST = CT + ( ) (L std L loc ) + E + DT 15 1 L Loc for Champaign = -88.26 W (of meridian) University of Illinois at Urbana-Champaign DAYLIGHT AVAILABILITY Architecture 342 Fall 2006 M. Boubekri, Ph. D. Solar Time Solar Time E = 0.165 sin 2B - 0.126 sin cos B 0.025 sin B [decimal hrs] T sol = Local Solar time (decimal hrs) T ct = Clock Time (decimal hrs) L std = St. meridian for the local time zone (degrees west) L loc = longitude of actual location (degrees west) E = Equation of time (hrs) DT = Daylight savings Time correction (DT = 0 if not DST) Correction for Solar Time n = Julian date (1 365) ] rees [deg 364 ) 81 n ( 360 B = T sol = T ct + E + 4 (L std L loc ) + DT 4 University of Illinois at Urbana-Champaign...
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This note was uploaded on 04/07/2008 for the course ARCH 342 taught by Professor Boubekri during the Fall '07 term at University of Illinois at Urbana–Champaign.

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Daylight Availability2 - 1 University of Illinois at...

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