22_Microclimate_EA_2005_handout

22_Microclimate_EA_2005_handout - Wind and architecture …...

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1 Microclimates Starting with the big picture : The sun’s heat is spread unequally on the Earth’s surface The redistribution of this heat by wind and rain The Coriolis ‘Force’ on moving bodies Pulls to the right in the Northern Hemisphere, to the left in Southern Radiation outward Rising air here: (clouds, rain) Subsiding air here More rising air here Tradewinds and Westerlies
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2 Wind, Mountains, and Moisture Seasonal pressure systems and resulting wind patterns The Sea Breeze
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3 San Francisco: Fog through the Golden Gate
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4 Wind effects, wind control The earth’s ‘boundary layer’ above different terrain roughnesses Windflow visualized over smooth terrain Shelterbelts for crop protection, Devonshire
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5 Patterns of airflow over a barrier—50% porosity provides the largest area of shelter; solid barriers have much shorter wind shadows Flow through a deciduous forest canopy, with and without leaves Temperature differences over a landscape Wind accelerates up and over hills; the lee side is hard to predict—it may provide shelter but sometimes can increase the wind
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Unformatted text preview: Wind and architecture … 6 Snow drifts around a silo—note the scouring to windward and around the two sides, also the size of the wake area 7 Funnels accelerate the wind Pockets can trap pressure; provide local areas of shelter In design, wind can be sheltered or enhanced or both Urban street trees 8 Modifying wind, radiation, rain. . Seating in cold windblown coastal sites. . Pleasure and memory… Pressure, temperature, and elevation: the Adiabatic Lapse Rate Actual lapse rate history from dawn to the following day (sunny conditions) 9 Day vs night; unstable vs stable Stability visualized: radiation fog draining through gap A Classic Case of a Frost Pocket…. Cold air acts like a sticky fluid Two ways to protect orchards from radiation cooling 10 Surface temperatures- -effects of soil, moisture, vegetation, and manmade surfaces Temperature profiles in a forest canopy, night vs day Temperatures above pavement compared to vegetated surfaces The urban heat island: San Francisco...
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This note was uploaded on 01/13/2010 for the course ARCH 140 taught by Professor Benton during the Spring '08 term at Berkeley.

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22_Microclimate_EA_2005_handout - Wind and architecture …...

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