The White House goes solar (again) with photovoltaic solar collectors and a solar hot water heater.
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Tag Archives: energy efficiency
Assorted Links
Assorted Links
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Assorted Links
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Death Rays
3So… what on earth does this blog have to do with death rays?!
Well, yesterday the story of the “Vdara Death Rays” flew through a couple building science mailing lists that I am on. Basically, the building designers put very reflective glass on the outside of a curved building, which wound up posing a problem for folks at a pool nearby (more below). However, it turns out that a building doesn’t have to be curved for highly reflective glazing to pose a hazard to nearby people or nearby buildings.
How does this fit into concerns about energy use? One of the reasons that the highly reflective glazing is used is to prevent heat gain and therefore reduce the amount of energy needed to keep a building cool.
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Image credit: Wikimedia Commons
The Las Vegas Review-Journal published a story a few days ago about the Vdara Hotel on the Strip in Las Vegas.
The tall, sleek, curving Vdara Hotel at CityCenter on the Strip is a thing of beauty. But the south-facing tower is also a collector and bouncer of sun rays, which — if you’re at the hotel’s swimming pool at the wrong time of day and season — can singe your hair and melt your plastic drink cups and shopping bags.
Hotel pool employees call the phenomenon the “Vdara death ray.” A spokesman for MGM Resorts International, which owns Vdara, said he prefers the term “hot spot” or “solar convergence” to describe it. He went on to say that designers are already working with resort staff to come up with solutions.
You can read the entire story here.
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Image credit: Wikimedia Commons
In Los Angeles, Walt Disney Concert Hall, by famous architect Frank Gehry, has had complaints about glare off the reflective surfaces.
While most of the building’s exterior was designed with stainless steel given a matte finish, the Founders Room and Children’s Amphitheater were designed with highly polished mirror-like panels. The reflective qualities of the surface were amplified by the concave sections of the Founders Room walls. Some residents of the neighboring condominiums suffered glare caused by sunlight that was reflected off these surfaces and concentrated in a manner similar to a parabolic mirror. The resulting heat made some rooms of nearby condominiums unbearably warm, caused the air-conditioning costs of these residents to skyrocket and created hot spots on adjacent sidewalks of as much as 60 °C (140 °F). After complaints from neighboring buildings and residents, the owners asked Gehry Partners to come up with a solution. Their response was a computer analysis of the building’s surfaces identifying the offending panels. In 2005 these were dulled by lightly sanding the panels to eliminate unwanted glare.
Frank Gehry had this to say when asked about potential for glare on a newer LA project (via the LA Times):
I had some bum rap at Disney Hall because of glare. That was 2% of the building had reflective stuff, and some pissed off lady (complained). So the County had to respond. (It took) A couple guys with steel wool and in about an hour and a half they fixed it. But it did appear as one of the 10 engineering disasters in the last ten years—talk about exaggerating. The county did a study of downtown LA that found 5 other buildings that were more reflective, but no one complained about them. So, we got to get more pissed off ladies.
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It has also been reported in Green Building Advisor that reflections from windows can melt residential vinyl siding.
Glass experts and home inspectors agree on one point: since vinyl siding can be melted by reflectance from conventional clear glass, a low-e window is not required… However, the use of low-e (or low-solar-gain) glass appears to increase the risk of melted siding. According to an article in the March 2007 issue of USGlass Magazine, “A study performed by Cardinal on this topic examined the impact of reflective coatings on this type of [vinyl siding] damage. ‘The more reflective coatings that are out there today, that are getting more popular, are going to create this problem,’ [Jeff Haberer] said. However, Cardinal found that even clear glass can become a significant heat source.”
Glass with a low solar heat-gain coefficient has a high solar reflectance. “What we are getting is very, very good windows,” said Jim Petersen, the director of R&D at Pulte Homes. “Now the energy that is not getting in the house has to go somewhere, and it’s being reflected.”
Read the entire story here.
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LBNL Open House on Saturday 10/2
Image credit: LBNL website
Lawrence Berkeley National Laboratory, located up in the hills overlooking Berkeley, California, is hosting an open house on Saturday, October 2.
Ever wonder how biofuels are produced, cool roofs and smart windows reduce energy use, the Internet was created, or supernovas are discovered? Families, community members, and others who want to learn the answers to these and other scientific questions are invited to attend Berkeley Lab’s Open House.
Visitors can talk directly with scientists conducting cutting-edge research, check out a cosmic ray detector, sequence DNA, create and measure their own seismic waves, build a motor at the Family Adventure Zone, or take a tour of the Advanced Light Source, one of the world’s brightest sources of ultraviolet and soft x-ray beams, among numerous other activities. Performances, displays, demonstrations, lectures, tours and food vendors will also be featured.
It is important to note that registration is required for everyone interested in attending. There are two sessions, morning and afternoon. More details are available here.
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Cut Energy Use 50% in Commercial Buildings
2The Department of Energy (DOE) and the National Renewable Energy Laboratory (NREL) just released two technical reports on how to achieve 50% energy savings in both new and existing large office buildings and large hospitals.
You can download the full report, “Technical Support Document: Strategies for 50% Energy Savings in Large Office Buildings,” as a pdf here.
You can download the other full report, “Large Hospital 50% Energy Savings: Technical Support Document,” as a pdf here.
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Lighting, Light Bulbs, and Lingering Habits
2Highlighting a few recent stories…
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Image credit: Wikimedia Commons
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Research by the California Public Utility Commission staff indicates that if enough existing lighting and lighting for new buildings incorporate the latest technologies, the state could achieve a 60 to 80 percent reduction in light-related energy use. New policies adopted by the commission promote that goal by encouraging utilities to rethink their current consumer subsidies, which tend to focus on compact fluorescents, in favor of the newer and more energy-efficient technologies. “We need to move on and look at how best to spend our resources on the next step of lighting,” said Theresa Cho, an aide to Commissioner Diane Grueneich. “Our goal is market transformation.” The shelves of Wal-Mart and other big-box stores are already full of compact fluorescents, she said – via the New York Times Green Blog.
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A trio of House Republicans, Joe Barton and Michael Burgess of Texas and Marsha Blackburn of Tennessee, have introduced the Better Use of Light Bulbs Act, which would repeal the section of the Energy Independence and Security Act of 2007 that sets minimum energy efficiency standards for light bulbs and would effectively phase out most ordinary incandescents – via the New York Times Green Blog.
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The Department of Energy’s inspector general released an audit on Wednesday showing that it is continuing to buy obsolete fluorescent lamps, bypassing the more modern technologies that it spent tax dollars to develop. Yet even more surprising, it is still buying the familiar incandescent bulbs in place of compact fluorescents. The department operates at 24 sites, and the auditors visited seven of them. “Despite the substantial benefits of C.F.L.’s, all of the sites we visited continued to purchase incandescent lights,” the report said – also via the New York Times Green Blog.
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Assorted Links
Greentech Media discusses the ongoing infighting between the solar and energy efficiency sectors.
The coal industry costs more money than it creates in West Virginia.
Earth2Tech says we should all be watching the Texas smart meter market, not California.
Is Wal-Mart going green or greenwashing?
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You can read our post on Greenwashing here.
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Hot Water, Lights, and Solar as a Service?
2A number of start-up companies are trying to formulate a business model that sells hot water, lights, air conditioning, and solar power as a service.
The rationale is that the folks occupying buildings don’t necessarily want to own the equipment that produces hot water, light, cool air, or solar power, but they do want the end result.
The current model is that the companies (such as Skyline Innovations and Metrus Energy) retrofit commercial and industrial buildings, retain ownership of the equipment, and then charge a fee for the energy avoided. Because the fee is almost always less than the cost of the energy avoided, and because the maintenance costs of the equipment are generally included in the fee, the building owner can see further savings.
You can read more about this at Greentech Media.
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