04_Horizon%20Shading_2008_handouts

04_Horizon%20Shading_2008_handouts - Lecture 4. Solar...

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1 Lecture 4. Solar Geometry & Site Shading The initial pointing was pretty good this year! But on close inspection there is a bit work to do Schema for Equidistant Sun Path Diagram A LOFSAC example: Recall our Solar calisthenics exercise? Determine the sunrise and sunset azimuths for our solstices? 36º NL A LOFSAC example: Sunrise and sunset azimuths are read where the month line intersects the horizon line 36º NL
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2 Chinon, France An entire townscape driven by access to light and air Alvar Aalto skylight in Denmark Manhattan Urban street canyons Urban Landscape example The 1950s Prudential Center in Boston The Darth Vader effect in residential addition projects SITE SOLAR ANALYSIS Tools of the Trade 1. Direct Observation of horizon using instruments 2. Horizon shading overlays for Sun Path Diagrams (LOFSAC) 3. Fisheye photographs of sky and Sun Path Diagrams (LOFSAC) 4. Casting Shadows on Architectural Models 5. Casting Shadows in Drawings 6. Using Profile Angles
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3 Presentation title: Sundials and Solar Geometry 1. Direct Observation of Horizon Our near term objective is learning to assess a site’s relationship with the sun. For this we will introduce you to several “tools of the trade” There are a variety of devices out there (some clever, some goofy) for accessing obstructions between a point of interest and “the solar window”. You can check out an Astro- Compass from the Pacific Energy Center Tool Lending Library complete with instructions on its use. We place the Arch. 140 Solar Transit in the clever category. The Solar Pathfinder is a commercial product that juxtaposes reflections of the horizon with a form of sun path diagram. 2. Horizon Shading Overlay All Sun Path Diagrams represent the hemisphere of sky directly above and relative to the ground plane. Coordinates are altitude and azimuth.
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4 A polar Sun Path Diagram There are several projection methods for polar diagrams A rectilinear Sun Path Diagram Sun Path Diagrams provide a very handy frame of reference for accessing horizon obstructions Obstructions from the previous diagram as seen on a Sun path Diagram (polar, stereographic)
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5 1. Casting shadows 2. Constructing a on a plan horizon shading mask Considers entire site Considers one point Different diagrams for One diagram for different times the entire year Conceptually easy Harder to understand Difficult to present
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04_Horizon%20Shading_2008_handouts - Lecture 4. Solar...

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