Greener buildings in our future

What is the most environmentally sustainable construction material available for erecting homes and buildings? If net carbon emissions per ton of material is the key measurement, the answer is framing studs and medium density fiberboard made from wood.

That is one of the key messages from a new issue of Eco-link, a publication of the Temperate Forest Foundation's Research and Education division, which focuses on Consumer Choices; Greening Your Purchases.

How much more efficient is wood over the other materials when all steps in their manufacture is taken into consideration? Taking a look at the following chart from the U.S. Environmental Protection Agency gives us the answer to this question.

At the extreme, virgin aluminum requires 137.3 times more carbon emissions per ton of material than wood.

Of course every material has its specific uses. You wouldn't build a skyscraper with wood beams and little glass. But with new Leadership in Energy and Environmental Design LEEDs® rating systems receiving much more prestige among builders, any material that raises energy efficiency while lowering its carbon materials footprint is going to garner more ratings credit.

Combined with the insulation superiority of wood over other more modern materials (steel and glass) that require much more energy to heat and cool, wood would appear to be on the verge of making a comeback.

Joseph Lstiburek, Ph.D., P.Eng., is a principal of Building Science Corporation LLC and an ASHRAE Fellow. He has twenty-five years of experience in design, construction, investigation, and building science research. Through the Department of Energy's Building America program, Dr. Lstiburek has forged partnerships with designers, builders, developers, materials suppliers and equipment manufacturers to build higher performance homes across the U.S. His company specializes in building homes that require less energy to heat and cool. Their designs utilize wood for structural support and fiberboard sheathing of surfaces. His presentations include one that advocates that Wood is Good.

Climate-specific design and construction of high performance homes is a cornerstone of all BSC work. We recently modified both our criteria and our North American map for the hygro-thermal regions. The changes are not drastic but they are important because they make our criteria and map align with the International Energy Conservation Code (IECC) Climate Zones as developed by the Department of Energy. Whenever the building science community and the code community get on (literally) the same page, this is good news for builders of any homes, but particularly those that build climate-tuned, high performance homes.

Treated wood in an assembly performs better in a fire than steel studs, and wood is not thermally conductive. Don't believe me? Visit New Zealand and Australia and check out some of their 10- and 20-story buildings. They use concrete structural frames and treated wood frame wall infill assemblies with gypsum board linings on the inside and outside of the wood frame assembly covered with open rain screen vented fiber cement panels. These structures are exceptionally energy efficient, low cost and sustainable.

Sustainable management of wood resources, with forests being a significant part of the carbon sequestration equation, will play and increasingly important role in our climate change future.

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technorati emissions, biofuels, bioproducts

Surprising MPG results for low blends of ethanol

One of the "knocks" on ethanol (pun intended) is that for all the performance and emissions improvement that it provides as an oxygenate for gasoline, the more that you blend in, the lower the miles per gallon you should expect. For the lay person, that means more frequent stops to the filling station - roughly one extra fill-up for every three the vehicle currently requires. Even at price parity the annoyance of increased stops may deter some from using E85 (which is 85% ethanol/15% gasoline).

While it may be true for high blends of ethanol a new study provides laboratory evidence that E20 and E30 blends actually improved MPG on the automobiles tested!

The University of North Dakota Energy & Environmental Research Center (EERC) and the Minnesota Center for Automotive Research (MnCAR) conducted vehicle fuel economy and emission testing on four 2007 model vehicles. The vehicles tested included a Chevrolet Impala flex-fuel and three non-flex-fuel vehicles: a Ford Fusion, a Toyota Camry, and a Chevrolet Impala.

Highway Fuel Economy Test (HWFET) testing on ethanol blend levels of E20 in the flex-fuel Chevrolet Impala, E30 in the non-flex-fuel Ford Fusion and Toyota Camry, and E40 in the non-flex-fuel Chevrolet Impala resulted in measured miles-per-gallon fuel economy greater than predicted based on per-gallon fuel Btu content. It is notable that the non-flex-fuel vehicles obtained greater fuel economy at higher blends of ethanol than the unleaded gasoline. In the case of the flex-fuel Chevrolet Impala, the highway fuel economy was greater than calculated for all tested blends, with an especially high peak at E20.

While only three non-flex-fuel vehicles were tested in this study, there is a strong indication that non-flex-fuel vehicles operated on optimal ethanol blend levels, which are higher than the standard E10 blend, can obtain better fuel mileage than on gasoline. The Ford Fusion and Toyota Camry obtained a HWFET mileage on E30 of 1% greater than on Tier 2 gasoline; the flex-fuel Chevrolet Impala showed a HWFET mileage of 15% on E20 better than Tier 2 gasoline, as shown in Figure ES-1.

Exhaust emission values for nonmethane organic gases (NMOG), nitrogen oxides (NOx), and carbon monoxide (CO) obtained from both the FTP-75 and the HWFET driving cycles were at or below U.S. Environmental Protection Agency (EPA) Tier 2, light-duty vehicle, Bin 5 levels of 0.090, 0.07, and 4.2 grams/mile, respectively, for all vehicles tested, with one exception. The flex-fuel Chevrolet Impala exceeded the NMOG standard for the FTP-75 on E20 and Tier 2 gasoline.

It should be noted that it will take time to deploy E85 pumps in significant numbers throughout the U.S. During that time, the automobile manufacturers will be working not only on hybrid vehicles which improve MPG by sharing the load with plug-in and battery charges, but they will also be working on improving flex-fuel and ethanol combustion technology.

The automobile industry has had 100 years to fine tune their engines to work on cheap gasoline. Now that there is a mandate in the Energy Bill of 2007 to increase gasoline MPG significantly there will be significant research invested in improving performance on all kinds of fuels and configurations. Perhaps the relative energy content of the fuel will cause less concern to the driving public as the frequency of fuel fill-ups declines.

As far as emissions are concerned, that will be an area of focus for car manufacturers as well. They have innovated catalytic converters and carburetor designs in the past. There is no reason to expect less from them in the future as public demands turns to competitive environmental performance.

We will doubtless see many breakthroughs as thinking outside the fossil fuel paradigm box explodes.

technorati emissions, biofuels, vehicles, bioenergy, bioproducts

"Energy Victory" - Book of the Sentry

In September of 1911, the fate of two world wars was pre-ordained by England's young First Lord of the Admiralty. He made a choice at considerable national economic and political risk that linked England's future to a dependence on its North Atlantic political, military, and trade relationship with America. Still, Winston Churchill decided the advantages far outweighed the liabilities. From that point on all ships in the Royal Navy would run on oil (which England imported) instead of coal (which the British isles could stockpile in rich abundance).

This counter-intuitive decision meant that England's battleships could be built lighter, refuel at sea, and stoke their fires without drawing precious manpower during combat. As he stated it - "If we overcame the difficulties and surmounted the risks, we should be able to raise the whole power and efficiency of the Navy to a higher level."

It was this advantage that eventually destroyed the coal-burning German navy of WWI. It was lack of access to oil supplies that defeated both Germany and Japan during WWII. The Axis powers had trained troops and effective weapons systems but they couldn't hold the front without fuel.


Robert Zubrin, author of the soon to be released Energy Victory: The War on Terror by Breaking Free of Oil, cites this history and contrasts it to our harrowing predicament of today. Not only are we thoroughly dependent on an energy resource we no longer control, but those who do control it now have our treasure to fuel terrorism against us and create chaos around the world. With thirty years warning we have squandered ample opportunity to end our dependence on foreign oil supplies. There is no more time to waste.

It is our time to make a decision like Churchill's: define new alternative energy standards, develop a decentralized plan of production and infrastructure development, and stick with it through decades of administration changeover. The challenge is not to pick one alternative, but to increase the range of choices that enable consumers to make purchase decisions based on value (whatever that may be for each decade) instead of allowing ourselves to coerced into making bad decisions caused by limited access.

I highly recommend Robert Zubrin's book to readers of this blog. It is scheduled to be released October 31st by Prometheus Books. In this well-researched study he paints a picture of our current predicament in the Middle East including foreign intrusions into U.S. policymaking. He follows that with an evaluation of alternatives and a broadbrush plan for how we can substantially reduce our dependence within a decade. He excoriates policymakers who perpetrate what he calls the "hydrogen hoax." He draws lessons from the "Brazil experience" and shows how "The New Alcohol World Economy" can benefit developing and developed nations alike. He also addresses "global warming", explains his cynicism about hydrogen, and defends nuclear power as a clean source of electricity. But the bulk of the book is focused on the use of biofuels to break our dependence on oil.

Book orders can be reserved on Amazon right now. Look for book signings at future alternative energy conferences.

technorati bioenergy, biofuels, ethanol, syngas, cellulosic, legislation, decentralization, security

High Performance E85 with Jay Leno

E85 detractors often cite the comparative high energy content of gasoline to ethanol. It is true that currently designed combustion engines and even current flex-fuel models get lower mileage on ethanol than they do on gasoline. However, that is far from the whole story.

On Jay Leno's Garage website he features a video titled "E85 Demystified" which contains an interview with noted engine designer Carl Banks who specializes in high performance engine design. Carl insists that the reason that automobiles don't run as well on ethanol as they do on gasoline is because they are not designed to. If they are designed to, the cars would operate with much higher performance because of the relatively high compression ratio of ethanol compared to gas.

"It’s the octane number,” he says. “Octane is a rating of knock-resistance. The higher the number the better. E-85 is 105 octane.”

Coupled with plug-in hybrid automobile technology, it is not likely that there will be an appreciable difference between buying gasoline or ethanol because the mileage will be dependent on electric storage efficiency and the secondary motor efficiency for whatever fuel it runs on. The decision to buy ethanol is likely to hinge on the comparative price of the fuel options and its availability at local pumps.

technorati emissions, biofuels, vehicles, bioenergy, bioproducts

A scientific assessment of plug-in hybrids

Clean Edge News published a story on a new report that analyzes the benefits of PHEVs (Plug-in Hybrid Energy Vehicles).

The EPRI-NRDC study represents the most comprehensive analysis of the potential reductions of global warming and other emissions from wide-scale introduction of PHEVs over time. The study addresses the impact that lower-emitting electricity generation can have for increasing these benefits.

How would air quality and greenhouse gas emissions be affected if significant numbers of Americans drove cars that were fueled by the power grid?

A recently completed assessment conducted by the Electric Power Research Institute and the Natural Resources Defense Council made a detailed study of the question – looking at a variety of scenarios involving the U.S. fleet of power generation and its fleet of light-duty and medium-duty cars and trucks.

The objectives of this study are the following:
• Understand the impact of widespread PHEV adoption on full fuel-cycle greenhouse gas
emissions from the nationwide vehicle fleet.
• Model the impact of a high level of PHEV adoption on nationwide air quality.
• Develop a consistent analysis methodology for scientific determination of the
environmental impact of future vehicle technology and electric sector scenarios.

The study focused on plug-in hybrid electric vehicles (PHEVs) and projected changes in power generation technology from 2010 through 2050.

The EPRI Perspective
Policymakers, technology developers, and utility and environmental planners need objective and accurate information to make sound decisions about developing and deploying PHEVs in support of national energy and environmental policy. PHEVs offer the potential for reducing both emissions and fuel consumption, simultaneously addressing the issues of global warming and the nation’s dependence on imported oil. Quantifying these benefits has proved challenging, however, and misinformation has circulated about the environmental performance of PHEVs.

Summary of Results
Because of the significant reduction in emissions from gasoline and diesel fuel use and because caps are in place for some conventional pollutants for the electric power sector, the study finds that in many regions deployment of PHEVs would reduce exposures to ozone and particulate matter, and reduce deposition rates for acids, nutrients, and mercury.

On the other hand, because of assuming no further controls beyond existing regulations for the power sector, ozone levels would increase locally in some areas. Similarly, the direct emissions of particulate matter and mercury would increase somewhat and some regions and populations would experience marginal increases in exposures to those pollutants. However, as explained in the key findings, PHEVs do not increase the U.S. contribution to the global mercury budget over the long term.

Overall, the air quality benefits from PHEVs are due to a reduction of vehicle emissions below levels required by current regulation (due to their non-emitting operation in all-electric mode), and because most electricity generation emissions are constrained by existing regulatory caps. Any additional increase in the amount of all-electric vehicle miles traveled or further emissions constraints on the electric sector would tend to magnify these benefits.

technorati BIOoutput, emissions, electricity, vehicles

GM's "green image" challenge in L.A.

Los Angeles has become a tough car market for General Motors. Toyota sold 50% more Priuses in L.A. last year than all the cars GM sold here combined!

That frank admission was part of the message presented by "good cop" GM North America President Troy Clarke to a small, rapt audience of bloggers at the historic and very scenic HRL Laboratories in Malibu, CA.

GM's corresponding "bad cop" would be Chairman Rick Wagoner who on June 5th at the shareholders' meeting criticized the raising of CAFE standards and the U.S. government's mileage requirements - which, subsequently, were added to the Senate's version of the 2007 Energy Bill. The new legislation mandates increases to average fuel economy by 40 percent to 35 miles per gallon for cars, SUVs and pickup trucks by 2020.

Producing cars that will meet the standard aren't the big problem for GM. However, squeezing that kind of economy from SUVs and pick-up trucks will require risky and significant technological redesigns of the propulsion system (considering the weight of the vehicles and loads they are designed to handle) with no assurance that the standards set by implacable public and political expectations won't move again. Since California is GM's strongest market for trucks (with three times as many GM trucks sold in Southern California than cars), the stakes are very high.

Both Clarke and Wagoner insist that the future of the company is tied to a successful transition away from gasoline-powered technology. They contend that GM currently leads all U.S. manufacturers with over 30 vehicle models that are rated above 30mpg.

Their plans for the market is to continue to introduce a number of new hybrid and electric cars over the next decade. Some of these represent new technological approaches to the twin transportation challenges of increasing fuel efficiency while lowering emissions. Most are planned to be flex-fuel compatible, able to run on any blend of gasoline and ethanol.

Author's note - In my opinion all combustion engines produced by GM factories should be flex-fuel compatible because it doesn't cost much to do at the factory ($50-200/vehicle vs. thousands for hybrid technology) but allows the consumer the greatest number of fuel purchasing options (simultaneously depressing prices while reducing fossil fuel dependence). It will solve the chicken/egg dilemma faced by service stations of having enough compatible ethanol vehicles available to justify installing the pumps. And it starts the clock on when we cycle out all gasoline-only vehicles - which some estimate will take 15 years.

Still, L.A. is a market that relies more on image than on substance. Sometimes that image is the sleek styling and high performance characteristics of the vehicle. However, with the one-two punch of oil addiction and global warming fears, image and status now comes from driving "greener" vehicles - which is why the ho-hum Prius body shape is looking more stylish every day (while Hummer and Suburban owners are ducking accusatory glares from outraged fellow citizens).

So how can GM crack back into the global trendsetting L.A. market? Apparently Troy and GM's local public relations agency, Manning Selvage & Lee (MS&L), believes that building non-traditional relationships with bloggers and their audiences is an effective p.r. strategy - á la The Tipping Point. Convince some passionate, funky bloggers of the company's sincerity and it just might infect their audiences - leading to a cascade of positive image-building and sales.

MS&L calls it One Across Marketing:

One Across Marketing is MS&L's signature approach that strives to build a relationship between a consumer and brand. It focuses entirely on the phenomenon of information "wildfires" or "viruses," which are transmitted by word-of-mouth, usually among individuals who "cluster" (often virtually) around issues, shared situations, lifestyle needs, entertainment pursuits, etc. Driven by one-to-one communications, One Across approaches include: epidemic campaigns, E-community mobilization, influencer seedings, vernacular PR, and grass-tops marketing.

I'm not sure what category I fell into but I'm glad it was good enough to get me invited.

During his speech Troy Clarke talked about effective marketing from his personal viewpoint:

We get the opportunity to talk publicly in the auto industry typically at Auto Shows where we have these wonderfully orchestrated backdrops of cars and models. It is a very tailored environment for us to be able to tell our story to alot of press over a short period of time.

I had the opportunity to do something a little different. In Chicago, interestingly, it was still an Auto Show venue but it was outside the Detroit area and I was asked if I would talk to four bloggers. (I did) and in ten to fifteen minutes this dialog broke out which was kind of a public relations first. I turned to my public relations people and said that this feels a lot better to me than the typical interaction. Part of the reason why is that I learned alot.

Some of this stuff was stuff I didn't want to learn. Some people were making comments to me that I hoped that they wouldn't make. But the fact that they made them accomplished more than I expected.

Well here is a piece of advice from this blogger that I would hope GM and MS&L would hear:

In October 19-20 Santa Monica will host its second Alt Car Expo. Last year's event was much more fun and informative about green transportation at a grass roots level than the glitzy L.A. Auto Show across town (see A Tale of Two Auto Shows). Toyota was a huge beneficiary because most of the alternative designs were converted Priuses. GM had a paltry presence at this event (one flex-fuel pickup and a salt-in-wound carcass EV1) and was not even listed as a sponsor. This year none of the Big Three is a listed sponsor - but Honda is. This show is a green opportunity for GM to build bridges with the Southern California market.

One interesting new propulsion approach that Troy focused attention on is being demonstrated by the new Chevy Volt, a 5-seater concept car. Its "E-Flex Drive" always delivers power to the wheels through its battery charged electric engine. However, after the initial plug-in charge is depleted (at about 40 miles) an onboard flex-fuel combustion motor can generate a surplus charge giving the vehicle a potential range of 650 miles between charge and refill. GM is logging votes from consumers who would like to see the vehicle produced and on the showroom floor. The current tally of nearly half a million votes is about 99.5% in favor. I would gladly sign up to be a test driver.

I came away very impressed by the sincerity of the presentation and the approachability of its speaker. Just walking around on a tour, I was able to steal 5 minutes of uninterrupted time with Troy to talk about my pet projects - promoting the 25x'25 Alliance (I gave him a lapel pin), expanded recycling of waste-to-energy, the energy renaissance potential of a depressed paper and pulp industry, and the need to support local regulatory reform efforts in California.

No, we didn't talk about cars, but the kicker is that he echoed my sentiment that all of these facets are necessary parts of the new continuum that will affect the sale of cars in the coming decades. To make green profits on its green product offerings, GM will not only have to develop and deploy new technologies, but will also have to weather the challenges of fickle public opinion, shortages in raw materials and energy supply, strained labor relations, unpredictable world events, and environmentally sensitive regulatory reform.

It's a daunting task for any multi-national corporation. Of the Big Three in America, I'd put my money on GM.

technorati BIOoutput, electricity, biofuels, vehicles, bioenergy

Ethanol Boosting Systems for Automobiles

Biofuel naysayers have a wealth of criticisms to use if they really want to derail the renewable energy juggernaut. "The EROIE is not as good as petroleum" "The feedstock is better used as food" "The emissions from ethanol is more toxic than gasoline" "Subsidies are the only reason that ethanol producers make any profits", etc.

Well the oil industry "wasn't built in a day" either (and the resemblance to Rome is pretty apt). The reality is that if Henry Ford had succeeded in encouraging the use of ethanol when he produced the first Model T, engines would have developed much differently than they did and the EROIE, toxicity, feedstock diversity, and subsidy issues would have been solved a long time ago. Give ethanol a hundred years and lets see how efficient and clean it and other biofuels can be.

Here are excerpts from an October 2006 article in Green Car Congress that demonstrates the potential for redesigned combustion engines that exploit the high octane of ethanol.

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Startup Working to Commercialize Direct Injection Ethanol Boosting + Turbocharging
Ethanol boost with turbocharging promises a cost-effective means to obtain high fuel efficiency in gasoline and flex ethanol/gasoline powered engines.

MIT scientists and engineers earlier this year founded a company—Ethanol Boosting Systems, LLC (EBS)—to commercialize their work on direct-injection ethanol boosting combined with aggressive turbocharging in a gasoline engine. (Earlier post.) The result is a gasoline engine with the fuel efficiency of current hybrids or turbodiesels—up to 30% better than a conventional gasoline engine—but at lower cost.

EBS has a collaborative R&D agreement with Ford, and anticipates engine tests in 2007 with subsequent licensing to Ford and other automakers. If all goes as expected, vehicles with the new engine could be on the road by 2011.

The foundation of the approach is the enhanced knock suppression resulting from the separate, direct injection of small amounts of ethanol into the cylinder in addition to the main gasoline fuel charge.

The injection of a small amount of ethanol into the hot combustion chamber cools the fuel charge and makes spontaneous combustion much less likely. According to a simulation developed by the MIT group, with ethanol injection the engine won’t knock even when the pressure inside the cylinder is three times higher than that in a conventional SI engine. Engine tests by collaborators at Ford Motor Company produced results consistent with the model’s predictions.

With knock essentially eliminated, the researchers could incorporate into their engine two operating techniques that help make today’s diesel engines so efficient: a high degree of turbocharging and the use of a higher compression ratio.

The combined changes could increase the power of a given-sized engine by more than a factor of two. But rather than seeking higher vehicle performance, the MIT researchers cut their engine size in half. Using well-established computer models, they determined that their small, turbocharged, high-compression-ratio engine will provide the same peak power as the full-scale SI version but will be 20 to 30% more fuel efficient.

The ethanol-boosted engine could provide efficiency gains comparable to those of today’s hybrid engine systems for less extra investment: about $1,000 as opposed to $3,000 to $5,000. The engine should use less than five gallons of ethanol for every 100 gallons of gasoline, so drivers would need to fill their ethanol tank only every one to three months. The ethanol used could be E85.

Given the short fuel-savings payback time—three to four years at present US gasoline prices—the MIT researchers believe that their ethanol-boosted turbo engine has real potential for widespread adoption.

To actually affect oil consumption, we need to have people want to buy our engine, so our work also emphasizes keeping down the added cost and minimizing any inconvenience to the driver.
—Daniel Cohn, MIT senior research scientist and CEO of EBS

technorati BIOoutput, emissions, biofuels, vehicles, bioenergy, bioproducts