This Sunday, October 2nd is the final day for public
viewing of the 19 student-built solar-powered homes of the Solar Decathlon on
the National Mall. The excitement is
building as the points are adding up and a winner is coming into focus. Tomorrow, Saturday Oct 1st, the
winner will be announced, the team that has accrued the most points across the
10 categories in fields such as architecture, engineering, energy and
affordability.
Many of the houses incorporate some of the technologies and
green design strategies that I described in yesterday’s post, but the best
houses are the ones that bring it all together beautifully. Here are 3 of our favorites:
LIVING LIGHT by the University of Tennessee
This house is based on the cantilever barns of Southern
Appalachia, with an open plan anchored by a dense core at each end. But the real intelligence is in the envelope.
The all-glass north and south elevations consist of a 16”
thick double-façade system, with a fixed plane of glass on the exterior,
alternating fixed glass and full-height casement windows on the interior, and
internal blinds. In the winter, the air
space within the south-facing façade collects heat that is directed to an ERV,
supplying the home with preheated air.
In the summer months, the system works in reverse, drawing fresh air
from the north façade by the ERV and pre-cooling it before it hits the ductless
mini-split units. Exhaust air is
directed through the south façade to cool the cavity and reduce heat gain.
Energy is generated from a 10.9 kW rooftop array of
cylindrical PV panels. Look closely: those are cylindrical tubes that make up the
canopy over the south façade. Thin-film
PVs are wrapped around these tubes, collecting sunlight from any angle. There is no need to worry about the correct
angle of the panels here, since the cylinders absorb sunlight from all
directions.
You can get more info on the University of Tennessee solar
house from the project website, livinglightutk.com, including some great
detailed descriptions and explanations of the smart façade, roof top array, and
more, at: livinglightutk.com/smartsystems/
WATERSHED by the University of Maryland
This house is all about the conservation and management of
our water resources. Coming from the
Chesapeake Bay area, the students of the University of Maryland drew
inspiration from the 64,000 square mile Chesapeake Bay watershed and have
designed a house that addresses the storm water issues that threaten this
fragile ecosystem.
The form of the house is defined by two rectangular modules
with a split-butterfly roof. A 9.2 kW solar
PV array covers one side, and a green roof tops the other. Rainwater is captured from the roof and
directed to a series of captured wetlands, where the water is naturally
filtered by plants until it can be pumped out for reuse as irrigation
water. Greywater from the shower is also
directed to the constructed wetlands for reuse.
Finishes include thermo-treated exterior wood siding of poplar and ash, and recycled concrete countertops.
This is the 4th
time the University of Maryland has competed in the Solar Decathlon, and their
experience is paying off: as of this writing, they are currently in 1st
place.
More information on WaterShed can be found at the University
of Maryland project website, 2011.solarteam.org.
SELF RELIANCE by Middlebury College
This is the first year that a Vermont school is competing in
the Solar Decathlon, and as a Vermont architect, I’m happy to say that
Middlebury College has put up an impressive first showing.
The Middlebury house, dubbed Self Reliance, is a modern take
on the traditional Vermont farmhouse. It
hits so many of the themes we all associate with the Vermont lifestyle: natural
materials, sustainable food production, and family-friendly spaces.
Wood floors were harvested from Sugar Maple trees on the
Middlebury campus. The kitchen floor
and island countertop is made of local Vermont slate. And the children’s bedroom furniture is made
by our friend Lincoln Brown of Modern Vermont.
Self Reliance is focused on personal, sustainable food
production. A greenhouse wall in the
kitchen is not much more than a system of shelves for growing potted vegetables
and herbs, but it is centrally located and promotes home-grown healthy eating. By making this such a prominent feature of
the house, the students are trying to highlight the connection between local
food production and energy use.
This is a very family-friendly house, designed for a family
of four, with a division of public and private spaces. Most of the other schools seem to struggle
with the space constraints of the competition, designing homes under 1,000
square feet with murphy beds, movable walls, and multi-purpose spaces. Many don’t even have real bedrooms. The Middlebury house actually has TWO
bedrooms, and a play loft accessible by a metal ladder.
Middlebury is doing very well for this being their first
time in the Solar Decathlon. They scored 4th in the prominent Architecture category, and came in 1st
place for “Home Entertainment”. This is
one of those categories that aims to show that these are real, livable homes,
so the students had to throw a movie night and 2 dinner parties. They probably won due to the delicious localvore meal
they prepared, which their guests praised as being very “Vermonty”.
On Wednesday, Metropolis Magazine called Self-Reliance one of
“the two most striking projects at the Decathlon”. They described it as “a warm and
straightforward modern version of a traditional New England home that
beautifully uses native Vermont materials.”
You can read more about Self Reliance on the Middlebury
College project website, solardecathlon.middlebury.edu
Congratulations to the Middlebury team and to all the teams
at the Solar Decathlon, and good luck tomorrow as the grand prize winner is
announced!
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