We have seen the future of buildings in an energy driven
world. Perhaps more accurately we have seen pieces of potential futures. One
possible future is DOE/NREL’s new Research Support Facilities (RSF) project for
the NREL campus. This project by the design-build of Haselden and RNL’s is designed to be a prototype for the future of zero energy
buildings. Everyone involved on the NREL RSF has learned a great deal from this
project and we have been asked by the Department of Energy to share these
lessons. One of the Department of Energy’s goals is to make zero energy
commercial buildings market viable by 2025.
The NREL RSF project shows a zero energy building future
where buildings are optimized for multiple climate responsive passive
strategies, and then complemented by very efficient mechanical and electrical
systems – extending even into the design of the data center and the IT system
for the building. This low energy building approach lends itself well to on-site
renewable energy applications, which can then be sized as small as possible to offset
the energy needs of the building. This approach can yield projects with
significantly better energy and carbon reduction results than typical ENERGY
STAR, LEED or 2030 Challenge benchmarks. In fact, this approach may even get us
to the end game of the 2030 Challenge today.
The NREL RSF project has a very simple and direct form that
is driven by energy. It is not very different from common building forms
pre-dating air conditioning. The NREL RSF is a letter shaped building – in this
case an “H”. This gives the building two long thin wings or “fingers” with the
proper solar orientation and a connecting spine. The building was designed in
section first to ensure proper daylighting, natural ventilation, thermal mass,
transpired solar collection, and photovoltaic energy generation.
In addition to architecture, RNL has a strong urban design
and master planning practice. We deal with the same energy and form issues at
this scale. A unique emerging benefit of this is the ability to test new
architectural and urban design ideas within a master plan. While our master
planning approach addresses important sustainability issues such as land use,
orientation, solar access, energy and water infrastructure, transportation, microclimates,
pedestrian comfort and wind patterns – it doesn’t always have the scope to design
the actual architecture. However, populating the urban plan with architecture
helps it come to life. The architecture in these test beds is speculation – not
unlike the speculative architecture and urban designs of sci-fi film sets. This
provides an opportunity to speculate on new forms of energy driven architecture
which leads to continued innovation. The speculative architecture on one of
RNL’s recent sustainable city master plans in the UAE takes this idea of the
“letter” or “finger” building into a more three dimensional, sculptural
approach. The building becomes a vessel or body with more surfaces interacting
passively with the environment.
There are many emerging design tools that will allow us to
design more fluidly around energy. As BIM models become more energy model
friendly we have quicker feedback on design decisions early in the process. New
design tools are allowing us to automate the manipulation of form in direct
response to energy. Tim Meador of RNL has been experimenting with this idea
using Rhino 3-D modeling software with a Grasshopper algorithm plug-in using
data from an Ecotect model. Surfaces can be scripted to respond to
environmental data such as solar radiance which then can automate the free form
depth of louver blades for shading or adjust the size of apertures for solar
control.
The design of energy systems inside and outside our buildings
will also be significantly different in the very near future. Starting on the
inside, the occupants of a building have a significant impact on energy use. RNL
is finding that in low energy buildings the plug and server loads account for
more than half of all the energy use. This is a tremendous opportunity for
improvements in occupant behavior, occupant energy feedback and green
information technologies. If you have ridden in a Prius you understand the
power of feedback on behavior. As you see your instantaneous MPG on the
dashboard display you instinctively (or sometimes very purposively) make
changes to your driving to move that MPG number up. The same technology is
available in buildings.
Outside lies the electrical grid. We have all heard that it
is antiquated and needs to be rebuilt, but apparently the grid is also dumb.
Enter the smart grid. The idea is to run a communication signal on top of the
electrical current on the same power line. With a smart grid the energy
producer will have direct two-way communication with the energy consumers. This
strategy reduces peak demands by managing energy use at the consumer level
(demand side reduction). This opens up a world of possibilities including smart
appliances, building energy interfaces, automation controls, better management
of distributed renewable energy sources, better energy management for consumers,
and better grid and equipment management for the utility. Xcel Energy is
leading the way on smart grid technology and Boulder, Colorado is living the smart grid future now as one of the nation’s first smart grid
cities.
How will all of these and other energy trends evolve to
drive buildings in the future? One of my favorite truisms comes from a computer
scientist named Alan Kay who said, “The best way to predict the future is to
invent it”. We have the power to invent a clean low-energy sustainable future.
To see the visual slide show on this topic go to: http://www.slideshare.net/tomhootman/how-will-energy-drive-building-in-the-future