Tag: efficiency

German Passive House building robots

A short video from German home fabricator Hanse House.  They do both stock and custom homes, but both are fabricated off-site.  The video shows their production facility, and some of the techniques for putting together a building in pieces.  It’s pretty awesome.  Half robotic assembly line, and half humans, building to what’s essentially a CAD specification, with pipes and wires already laid in place within the structural elements before it gets loaded on the truck that takes it off to the building — or rather assembly — site, where the foundation awaits:

http://www.youtube.com/watch?v=joNGqfLMZxY

And here’s a time-lapse of one of their Passive Houses being assembled on-site:

I wonder if they do multi-family buildings too.  What it would take to get a facility like this operating in Boulder County?  Other than a rebound in the housing industry of course.

A life cycle analysis of incandescent, CFL and LED light bulbs

Life cycle analysis of incandescent, CFL, and LED light bulbs – It’s important to make sure when you’re using a new technology that supposedly saves energy, that you haven’t just shifted the energy consumption from the operational to the manufacturing portion of the product’s life cycle.  This study compares three different lighting technologies: incandescent, compact fluorescent, and LED bulbs, and asks what the total energy input is to get ~400 lumens of light for 25,000 hours.  Both CFLs and LEDs save about 80% of the energy over incandescent bulbs.  For all bulb types, the embodied energy of manufacturing is only about 2% of the total energy consumed over the bulb’s life.  CFLs and LEDs were roughly equivalent energetically at the time of this study, but the LEDs produced less in the way of toxic byproducts.  The general expectation is that the efficiency of LED lighting will continue to improve, while CFLs are a pretty mature technology.  The two best LED bulbs on the market today, with warm yellow light, compatible with dimmer switches, and giving about 800 lumens of light output (equivalent to a 60W incandescent bulb), seem to be this 13W one from Lighting Science ($30) and the 12W Philips A19 EnduraLED ($40).  The prices seem high, but as with gas furnaces and boilers, electric motors and pumps, the cost of the electricity or fuel you run through the device ends up dwarfing the capital cost over its lifetime, so paying top dollar for efficiency is worthwhile.

Boulder’s Passive Aggressive Building Standards

Usually when people say that “better is the enemy of good enough”, they’re pointing out that striving for perfection can be a distraction from just getting the job at hand done.  There are other dynamics that involve these concepts too.  As social animals, we tend to judge ourselves against those around us.  Once our basic needs have been satisfied, our relative wealth or deprivation often becomes more important to us than our absolute level of well being.  We have little concept of how much is enough.  This can lead to the familiar runaway acquisitiveness (keeping up with the Joneses) when there is a well established (or constructed…) social norm favoring consumption.  Less obviously, it can also lead to an inappropriate lack of ambition when faced with an objective task that is not supported by widespread social norms.

Over the last couple of years Boulder has upped its building energy efficiency standards.  The new permitting regime requires buildings to perform better — net of on-site generation like photovoltaics — than the 2006 international building codes (IBC).  Smaller dwellings (< 3000 square feet) have to use 30% less energy than the baseline.  Medium homes (3000-5000 sq ft) need to do 50% better, and large ones (> 5000 sq ft) have to beat it by 75%.  Obviously this is an improvement over the previous situation, but in comparison to what is possible, and what is necessary to combat climate change, it’s actually pretty unimpressive.  Homes of all sizes built to the Passive House standard use 80-90% less energy than the baseline code, and they do it without counting any on-site power generation against the building’s energy consumption, whereas the HERS index that is used in the Boulder code does count on-site generation.  This is an important distinction, because the atmosphere doesn’t cancel out your nighttime coal-fired emissions with the solar electricity that you sell onto the grid during the day.  All it cares about is the total amount of CO2 released.

Continue reading Boulder’s Passive Aggressive Building Standards

Links for the week of September 28th, 2010

If you want to follow my shared links in real time instead of as a weekly digest, head over to Delicious. You can search them there easily too.
Continue reading Links for the week of September 28th, 2010

Shared Links for Jun 26th – Jul 7th

You can also search or subscribe to my linkstream over at Delicious.

Shared Links for Jun 25th

Shared Links for Jun 7th

Shared Links for May 11th

  • Where can you get Cheap Natural Fertilizers and Soil Amendments? – A nice concise list of natural sources for garden nutrients, when your compost pile just isn't quite enough. (tagged: gardening food organic fertlizer compost biology )
  • Pinko bastion spawns capitalist solution to solar financing – Boulder city/county passed the same kind of property-tax based financing of energy efficiency (and solar) improvements on the Nov. ballot too – modeled on Berkeley, but with enabling legislation at the state level (to avoid the kind of lawsuit Berkeley had to fight over whether or not they had the power to issue such bonds). The biggest worry I had in reading the Boulder initiative though, was that they had not yet come up with a good mechanism for ensuring that the improvements which were being proposed (more insulation, solar hot water, whatever) would necessarily save enough energy in order to justify the value of the bond being created. Hopefully they’ve fleshed that metric of value out much better by now (in both Boulder and Berkeley) and it’s not possible to abuse it… otherwise I suspect you’ll get deployment of faddish fixes (e.g. sexy-sexy PV instead of solar hot water, or better insulation, or super-windows, etc) instead of the best energy improvement per dollar invested. (tagged: finance capitalism investing energy efficiency sustainability green solar berkeley boulder bonds )
  • Campaign for a Car-Free Lincoln Park, Pt. 2 – A lack of car-free options for arriving at Lincoln Park, coupled with poorly lit, unsafe parking far away from the park's main attraction means everyone just drives their cars all over the park, on the grass. Across the street, the DMV has a huge parking lot which is totally unused after business hours, which is when the park gets the overwhelming majority of its use. Why not (gasp!) timeshare the DMV lot? Hopefully no small children have to get crushed by the marauding death machines for someone in the state and city government to take this idea seriously. (tagged: cars parking transportation urban planning design )
  • FlyingConcrete – Beautiful biomimetic architecture. Curving vaulted ceilings and stairways. Rounded sleeping nooks and pillars like trees. Traditional rectilinear construction is so boring. This is lightweight concrete (cement with perlite, pumice, and other lightweight filler added instead of sand and gravel) laid up on a mesh that's been shaped such that when the cement hardens, it's a load bearing compressive structure. (tagged: architecture art concrete design construction buildings sculpture )
  • Drew Endy and Jim Thomas Debate Synthetic Biology – An unusually good discussion about the future of biotechnology, and maybe the only time I've ever really seen the "debate" format work, and elicit relatively thoughtful interaction. I think they're both dancing around the fundamental question though, of to what extent (if any) society even *gets* to make a choice on this topic. (tagged: biology biotech genetics technology science future debate longnow engineering )

Shared Links for Feb 11th – Feb 12th

Shared Links for Fri, Feb 6th, 2009 through Sat, Feb 7th, 2009

  • Overcoming Obstacles to U.S.-China Cooperation on Climate Change – Guidelines from the Brookings Institute for the US and China to cooperatively address climate change and clean energy issues, without being combative. Executive summary sounds good, whole thing is 80 pages long. Given the positive economics for many energy efficiency measures, I thought there should have been a little more focus on the often erroneous assumption that addressing these issues has to be costly. (tagged: energy sustainability china policy climate efficiency brookings )
  • Amendment to Eliminate Bike Infrastructure in Stimulus – DeMint (R – SC) and Coburn (R – OK) are trying to kill all bike infrastructure investment in the stimulus package. Call them and your own senators and make sure it doesn't happen! (tagged: politics bicycle infrastructure policy transportation stimulus )
  • The Transparent Society – The essay that later became Brin's book of the same name, in which he argues that first, universal surveillance is coming, whether we like it or not, and second, that a world which is transparent – in which surveillance goes both (all) ways, is vastly preferable to one in which the illusion of privacy is maintained, and the powerful are the only ones with access to our information. (tagged: technology privacy transparency surveillance brin wired )
  • Make Love Not Porn – Hardcore (esp. internet) porn has unfortunately come (ha!) to substitute for sex-ed in our culture, so says Cindy Gallop. I think she has a point. And so she made this website, to try and point out the flawed generalizations that one might arrive at from being "educated" by online porn. I think it's worth noting also though, that the diversity of pornography on the web has steadily increased over time, and there's a lot of positive and realistic, and non-exploitive depiction of sex out there now, if you want to look for it. In particular Abby Winters, Beautiful Agony, and I Shot Myself come to mind. It's ironic (absurd?) that the site has an "18+ only" clickthrough on the front page. (tagged: porn sex love ted education )
  • Dept. of Energy to draft energy efficiency rules… 30 years late. – I can't believe I'd never heard of this. Apparently for the last 30 years, presidents have been refusing to direct the Dept. of Energy to draft enforceable energy efficiency regulations, despite being directed under law to do so by Congress. Finally in 2005, 14 states sued, and won, and Bush still failed to comply in a timely manner. How many other instances of the executive branch (both democrat and republican!) completely ignoring Congress on important issues are there? It's rare enough that Congress gets anything right – that the president should ignore them when they do is unconscionable! (tagged: politics policy energy nytimes green efficiency standards regulation )