Friday Video - Vancouver’s Stunning Six Acre Living Roof
Vancouver’s 6 Acre Living Roof from Dave Budge on Vimeo.
Most of the time we focus on the “design of sustainable finance” over here. This time, we are taking a moment to also look at building design and a particularly innovative application — to inspire us about the potential lying in every sustainable project and financial transaction.
Please enjoy this short video of Vancouver’s Living Roof, courtesy of Fast Company (courtesy of Treehugger).
The Vancouver Convention Center will be broadcasting the 2010 Olympics live, so city officials wanted the project to make a statement reflecting their sustainability values to the world. I hope that you’ll agree that what the design and construction team accomplished is stunning.
While life cycle costs are not discussed in the video, they do highlight the following innovative features:
“…the building also has black water treatment systems and desalination machinery to water the plants, a heat pump that uses seawater, and cooling via radiant floor. The bottom line is a water-use reduction of 60% to 70% over similarly sized convention centers.”
Energy Efficiency German-style & LEED Grows Legs
This Passivhaus is the winner of the 2007 Solar Decathlon. It was created by a team led by Professor Manfred Hegger, mentioned below
Last week, I moderated an energy efficiency symposium that brought together German and American building and energy experts. The Germans were here to sell us a few building energy products and services. The Americans were there to look and buy. After a few great presentations and some hefty debate from an engaged audience, I started synthesizing clear differences between how Germans and Americans approach high performance buildings.
So here’s a few statistics and slides from the presentations, to give you a picture of the current state of energy consumption, how its being reduced in Germany as well as some thoughts on why Germany and the US are achieving different results. Go here to the German American Chamber of Commerce Website to see all the presentations in full.
Germany & Japan Use less Energy to Create the Same Economic Value as the US Fred Pollack, an architect with Van Meter Williams Pollack helped frame the current state of energy consumption in the US with the following statistics from the International Energy Agency:
Energy Consumption, in $/Gross Domestic Product as of 2006:
- USA = 3.2 kwh/ $GDP
- Germany=2.4 kwh $GDP (25% less than the USA)
- Japan=1.5 kwh / $GDP (53% less than the USA, 37.5% less than Germany)
So Germany and Japan can create the same unit of economic value as the US for 25%-53% less energy than the US. When you add to that, the current fact that the dollar’s value has weakened sharply against both the Euro and the Yen over the past year, then the idea of the US economy’s exposure to energy price risk becomes even more concerning.
When it comes to energy security, Germans have been walking another road, at a faster pace, for decades. Historical context frames these ideas and you’re probably familiar with the American version. Both Germany and the US experienced severe energy price shocks during the 1970’s. This experience kick-started Germany’s national policies that mandated decreases in building energy usage. That success has supported a steady walk to some of the cornerstones of Germany’s great track record in lowering its fossil fuel dependency: the wildly successful feed-in tariff, the creation of the low-energy and Passivhaus standards as well as the Plus-energy House.
Dr. Manfred Hegger, Professor with the Technical University of Darmstadt put up a slide summarizing how residential energy consumption in Germany has decreased as new legislation was enforced and innovative construction methods developed. Click directly on image to see an enlarged version.
Reduced energy consumption in Germany is more closely associated with investment value preservation. The German presenters kept stressing how their ideas and products contributed to “investment security”. Americans currently talk about greening buildings in terms of lowering operating expenses, but the idea of investment security isn’t spoken about so widely. So I could see that German owners have developed the thinking that, to the extent a building is energy inefficient, the owner is exposed to energy price risk from the open market — a very bad deal. Bear in mind that Germany has 1) MUCH higher energy prices (gasoline in Germany now = ~$8/gallon) 2) a slower rate of economic growth than the US generally and 3) correspondingly lower interest and cap rates. So value appreciation through opportunistic rental rate increases like we can do here in the US (sometimes) is less likely.
Conversely, slow rental rate growth combined with volatile, already high energy costs greatly exposes a property to quicker value erosion. So Germans are combating real value deterioration via lowering building energy consumption. Energy has been relatively cheap in the US and American owners, while cost conscious, have focused on growing the top line and reducing first costs, but only now are thinking about risks to the building value from escalating energy costs.
Germans use an energy budget to drive the design and construction process, not just “optimization”. An energy budget is the maximum amount of energy a building is permitted to consume. Period. For example, in Germany, the low energy residential house standard basically restricts maximum heating usage to 30-20 kwh/sqm/yr (USA:8,000-6,000 kBtu/sf/yr). In the commercial property market, the concept has evolved to the point where an owner simply will not pay for a building that exceeds its agreed energy budget. It is the architect’s job to make sure that every building part and system works together to achieve the energy budget in addition to creating the building’s aesthetics. Over the years the energy budget of German commercial buildings has been reduced as innovations in building science were introduced. Architects and engineers distinguish themselves by the smaller scale of the systems that they
install into a building, not how much.
The Germans pointed out that the building is also usually cheaper, when it is dependent on smaller systems. They also had the strong opinion that American design and construction professionals still focus on “optimizing” using established building codes as benchmarks as opposed to obtaining the greatest absolute reductions in energy usage. And this optimizing mindset leaves too much room for tolerating more energy consumption out of buildings than is truly necessary. Their experience is that current building science and technology can deliver buildings that operate with greatly reduced energy consumption and systems at reasonable costs, if we Americans were to utilize an ‘energy budget’ mindset.
Measure Actual Energy Performance, Not Just Energy Modeled. One of the strengths of the discussions was that the German speakers had a great deal of actual data comparing the energy efficiency regulations implemented over the years with the actual energy decreases achieved. This supported the advice of Dr. Norbert Fish, Professor at the Technical University at Braunschweig, that one really can’t know a building’s actual energy consumption until its been tested during the first 1-2 years of operation. His slide below shows how widely the actual energy consumption of high performance buildings can vary.
LEED Gets Lots of Praise and is Growing Legs Andrea Traber, President of the USGBC Northern California Chapter, gave an update on the upcoming changes to LEED. I posted about this before and you can also find info about upcoming changes on the USGBC national website here.
The German participants were complementary about the LEED system as a way to provide a cohesive language to discuss the green building domain and its components. They also noted that they were seeing international investors, particularly Americans, approaching them in Germany and trying to relate green building performance there in terms of equivalent LEED ratings. So there was lots of interest in LEED generally, since it is starting to move through the investment market. After the event, I talked to a few German product manufacturers who said that they realized that in order to better market their products to US property owners, they were going to have to translate their products contribution to energy reduction into LEED-relevant performance data, since this has become the official language of the green building community in the US.
