Climate
Temperature climate:
Best configuration for a temperature climate
-Short wall facing west
-Overhang on long side on south
-Primary heat gain on roof
– Stagger horizontal or vertical
-Stacked high rise
City Planning: City (Northern, CA) or Minnesota best climate design
-Town structure closely dense, larger buildings grouped sheltering wind, but utilize sun/ solar
“Not” design loosely/free layout
-Dense but with shades
-Town character to be loosed/scattered
City planning – Thermal environment: Character of existing & new structures affects thermal environment: Shadow pattern.
“Not”: Mechanical system, texture, foot prints
Climatic characteristics: Temperature, humidity, wind velocity
Solstice: Winter December 21st-Longest night, Summer June 21st- Longest day
In hot arid climate:
Thick walls-Thermal mass: Materials with high heat storage value used in arid lands. (Arizona, New Mexico)
Wide overhangs
High ceilings are good designs
Southwest desert buildings:
Most significant: Recognize the climate and other problems of the area.
Deeply recessed openings are best shading for glazing in any directions.
Shaded glass is more important than insulated glass.
Radiation is more value than conduction.
Roof area is not that critical when compared to recessed glazing.
Vertical louvers (especially south) diminish solar radiation
Solar radiation:
South wall get maximum winter radiation.
Roof and east / west walls receive maximum radiation in summer
Cold climates vapor barriers in attic: Minimize moisture migration.
Not: Serve secondary water proofing, support insulation, protection
from insects
Roof overhang built in northern hemisphere seasonal adjustment for solar radiation: South facing overhang
Most important factor in residential units: Recieve sun part of winter day
Not: -West facing @ a premium
-Bedrooms away from harsh wind
-Mask units from breezes
Innovative technologies – Cost effective:
Site driven technologies: Wind turbines, photovoltaic, small scale hydroelectric. They are also relatively cost effective.
Fuel cell technologies and groundwater aquifer for cooling and heating depending on climate/environment.
Solar energy is limited in building on north side of high rises. High rises cause shadow on their northerly buildings
Solar: Sun chart shows: A) Path of sun by means of attitude & azimuth (21st day month). Sunrise to Sunset
B) Amount of sunshine based
C) Cloudiness not in chart
D) Heating degree days in not in chart
Solar site depends on slope & latitude. All earth @ same latitude gets same sun regardless longitude
Building Orientations: External influences: Climate, noise, views & solar. Foundation is not related.
Town 1 @ base of mountain & town 2 @ 3000′ above town 1
Town 2 is always cooler
Rural versus urban climate – Planted rural area:
Stabilize microclimate hard surfaces swing temperature fast plants absorbs & store heat. Plats increase transpiration & increase rainfall. Plants purify air
Geothermal: Needs mechanical for design & Architect to implement. Landscape (& structural) not involved. Outside beneath earth
Best use of overhang:
Sun @ low angle is fully captured
Ideal orientation and fenestration based on climate:
Latitude
Adjacent reflective surfaces
Interior room functions
Building heights
Avoid tree screens of sunlight
HVAC is an external to building issue – Secondary concern
Wind
Air movement – Degree of comfort @75 F degrees, 30 R.M., 100 FPM = Quite pleasant.
Less than 50 FPM = Not noticeable.
> 25 F PM: Drafty & annoying
Wind: Open plaza windward side of high rise:
Shelter Hotel, relocate the entrance, placing walls, trees are not very effective
Wind: Two building, smooth surface and one is steps or jagged
-Smooth surface building creates more turbulance, “not” wind acts same way regardless
-Turbulence is more on stepped building energy is dissipated
-Turbulence is a minimum concern in high rise & street
Wind and pressure: When velocity doubles, the pressure quadruples.
P = c V2