Posts Tagged ‘LA’

Weekend Links

June 21, 2014

pendleton* Discounting the distant future at 2.6% is acceptable to households and can be the basis for GHG reduction payback.

The Delaware County grass bio-energy project is under way, with Cornell University participating.

* Congratulations to Elias Behar of MeXSI Inc on receiving his Building Performance Institute accreditation.

Stadia

January 14, 2011

We have just started working on the renovation of a small baseball stadium, as a result of which I have been both visiting venues (the spectacularly light Honda Center in California) and looking at pictures of old stadiums, as you see here.

These are scans from Kodachrome slides that my son made while archiving the work of New York City painter Andy Jurinko, my friend and sometime collaborator (“Frozen Ropes”, Broadway at 74).

See if you can name the nine structures without peeking at the rollovers.

Two still exist.

The bottom structure, capacity 92,000, is a mile from our undergraduate studio, close enough that on autumn Saturdays you could hear the sellout crowd screaming while you drew.

Andy Jurinko 1939-2011

Roof Links

October 21, 2009

bp617_rooftops

* The albedo of an object is the extent to which it diffusely reflects light from sources such as the Sun. The albedo of fresh snow is 0.9 and that of fresh asphalt is 0.04

* Studies show that white roofs reduce air-conditioning costs by 20 percent or more in hot, sunny weather.

* How shiny is LA? The California South Coast Air Basin’s urban albedo is higher than its suburban albedo because the suburban land use has more vegetation. LBL did a fly-over to take measurements.

* Planted “green” roofs provide insulative value. They do not, however, have the reflectivity provided by white roofing materials, which reduce direct solar heat gain. When seeking highest efficiency per capital investment, the choice between a green roof and a white, reflective one requires study of alternative insulation schemes; climate is a major factor.

taghave-lav

Roofs in snow, Brett Weston

Lighting

March 6, 2009

gabriel-led

Light-emitting diodes (LED) are compound semicondutor devices that convert low-voltage electricity to light. General Electric scientists invented the first application of LED in the 1960s. Unlike conventional lamps that can shatter,  LED are resistant to shock and vibration. The solid-state nature of LED means no filaments to break or moving parts to fail.

The advantages of the technology vary with the application. Features of LED include 90% energy savings over similarly-bright incandescents, lamp-life minimum of 50,000 hours, and excellent cold weather start-up and performance. The disposal issue faced with mercury vapor and fluorescent lamps and ballasts is obviated.

Early applications included traffic signals replacement; the technology offers color rendering choices and significant lamp replacement and energy usage advantages over legacy incandescent traffic signals.

Applications have expanded to include parts for televisions, building interior and exterior lighting, signs, focused retail displays, flashlights, elevator call buttons, commercial and residential fixtures (those changing colored lights in your hot tub are LED), and transportation and street lighting.  The LED industry is estimated to have grown 50% year on year between 1995 and 2004, and for the period 2004-2009 the US market is expected to grow from US$3.7 B to US$7.3 B, the highest growth being in transportation uses (projection courtesy Oppenheimer research).

Use in transportation infrastructure continues, South Korea and Los Angeles, Califonia having recently announced major LED initiatives.

Remote monitoring capability facilitate “smart grid” applications; flashing street lights on the curb will one day signal emergency responders regarding the location of a call.

Photo of exterior fixture