Mountain Biking: Rubber side down- Time for a TurnaroundWell, my friends, things are finally looking up, and good timing, too, since I’m sure you’re all sick of me bitching. Recent bike build, including wheels… fun! In what feels like a fairly short time, I’ve come from sitting around … Continue reading → […]
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Passive solar saves energy without panels
The stone wall on the South Facade absorbs heat during the day, lowering the heat gain on the interior of the house. At night as the air cools the heat is given back into the surrounding air, warming the house naturally | photo and caption: flickr user Jeremy Levine
Taking advantage of the sun doesn’t mean you need costly solar panels. Passive solar is the heating and cooling of a building naturally by means of efficient site placement and energy efficient materials. Strategic positioning of a building in relation to the sun can be enough to heat your home and seriously cut your costs. Here in Boulder, we get a lot of sun, and you’re either fighting it or you’re working with it. Architects in Boulder know the value of passive solar:
If you’re building from scratch, siting a building correctly can save 20 to 30 percent in energy costs, says Joseph Vigil, formerly of VaST Architecture and currently creating a new firm, Workshop8.
Southern facing windows are the key to passive solar design, Vigil says.
“In the winter months when the sun angle is very low, it’s easy to get direct sunlight through the windows,” he says. “Then if it has a slight overhang in the warmer months, the overhang protects the south-facing glass from the sun’s rays. You don’t get a heat gain.
Colorado with its 300 days of sun a year is particularly well suited to passive solar design.
Architect Kelly Lerner told Mother Earth News more about the passive solar basics:
Kelly Lerner, architect and author of Natural Remodeling for the Not-So-Green House, says there are four things to consider when designing or remodeling a building to most effectively utilize solar energy: south-facing glass (glazing), shading, insulation and thermal mass.
“In most North American climates, the right amount of south-facing glass is 7 to 12 percent of the floor area of the building — a lot less than you might think if you’ve seen solar home designs from the ’70s,” she says. “In the ’70s, we really used too much glass with too little thermal mass, so instead of passive solar heat, we had something more like ‘passive-aggressive’ solar heat, creating buildings that were too hot during the day and too cool at night. Too much glazing can be a detriment on cold winter nights, allowing heat to escape.”
-Hannah Gentry
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[...] Taking advantage of the sun doesn’t mean you need costly solar panels. Passive solar is the heating and cooling of a building naturally by means of efficient site placement and energy efficient materials. Strategic positioning of a building in relation to the sun can be enough to heat your home and seriously cut your costs. [...]read more…. [...]