If we learn from our mistakes, students at Sanchez School will certainly benefit from the placement of this fence-top wind turbine. As anyone walking by could tell you, the generator would do better on top of this 40-foot edifice than at the sidewalk. But would that be enough? Industry rule of thumb suggests placing turbines [...]
For a basic understanding of building science, here’s a powerpoint presentation from EnergyStar. Click on “Crash Course in Building Science” to download it. http://www.energystar.gov/index.cfm?c=bldrs_lenders_raters.ResESMktgSalesPresentation
The watering system on the Dolores Street median looks grossly inefficient, but is actually par for the course. The EPA cites studies that show up to 50% of the 7-billion gallons of water a day used for residential landscape irrigation is wasted — due to overwatering, evaporation, or system over-design.
Well, at least they put in compact fluorescents. Now their bill for this pair of lights is a quarter of what it was. Obviously a photosensor would cut that down to an eighth or so. Say the original pair of 75w incandescents cost 150w x 24 hours x 365 days = 1314 kwh, x .15 [...]
I’m always looking for “no-brainers” in construction — things to do that just make too much sense not to do. Here’s my experience with radiant barrier: Radiant barrier is a heavy-duty aluminum foil that reflects 97% of the infra-red spectrum. It’s available on the underside of plywood roof sheathing for new construction, or in rolls [...]
A surprisingly effective way to draw light into a room is by use of a light shelf. These horizontal reflectors are mounted either inside, outside, or on both sides of a southerly-facing window. Sunlight bounces off the surface and onto the ceiling within. Any bright surface will diffuse daylight effectively. In my office though, I [...]