Details for: NET ZERO HOUSING - Why should you care?
Net zero housing is the ultimate form of affordable housing - insulated from rising energy costs
A net Zero home, at
a minimum, supplies to the power grid that is equal to the amount of power
purchased from the grid. In many cases, the entire energy consumption (heating,
cooling and electrical) of a net-zero energy home can be provided by renewable
energy sources. A net-zero energy home will always cost less to operate. Over
many years, this savings will add up, providing below market costs for heating,
electricity and cooling. The second benefit is lowered carbon footprint for
developments. The third and most critical benefit is the health of the
occupants of a net zero home, since fuels are not burned, emissions are non
existent, lighting is abundant, the environment of a netzero home is much
healthier to live in. This rewarding trend is spreading across the country.
The development of Net Zero Housing or ZEB (Zero Energy
Buildings) have been made possible through the progress made in new
construction technologies and techniques, and advances in energy capture
devices like low e glass, higher efficiency Photo Voltaic Panels, and so on.
ZEB are very popular in Canada, Europe and Australia, and are gaining
popularity in the US, for good reason. It is a smart investment.
To achieve minimal energy use, the design and construction
of zero energy buildings departs significantly
from conventional building practice. In conventional building design, the
emphasis is normally on minimizing construction costs. Designers rarely do any
energy analysis or life cycle operating cost calculations beyond those
necessary to comply with local building codes.
In the ZEB approach, every decision about major sub-system selection is
evaluated in terms of its future consequences on energy demand using life cycle
energy analysis. ZEB designers are usually prepared to increase construction costs
if doing so will reduce energy demand and operating costs by an equal or
greater amount. The ZEB approach might be described as "energy first"
building design. There are grants and low interest loans for this kind of
In addition to using renewable sources, zero
energy buildings are also designed to make use of energy gained from other
sources, natural lighting, and ground source heat pumps. They are normally
optimized to use passive solar heat gain, large thermal mass to even out temperature
variations throughout the day, and in most climates are super insulated. All
the technologies needed to create zero energy
buildings are available today.
Designers typically use sophisticated computer simulation tools to take into
account a wide range of design variables such as building orientation (relative
to the sun), window type and placement, roof overhang depth, insulation values
of the building elements, air tightness, the efficiency of heating, lighting
and other equipment, as well as local climate. These simulations help the
designers to know how the building will perform before it is built, and enable
them to model the financial implications on building cost.
Zero energy-building concepts can be seen as a
progression from other low-energy building techniques. Amongst these, in the US
is LEED and in Canadian R-2000 and the German passive house, standards have
been influential. Government and internationally sponsored demonstration
projects such as the first super insulated Saskatchewan House, and the
International Energy Agency's Task 13 have also played their part. And, in
particular, the many enthusiastic private individuals who commissioned houses
using cutting-edge low energy technologies have been vital. One of the first ZEB office buildings is the 69-story Pearl River Tower,
which will open in 2009 as the headquarters for the Guangdong Tobacco Company.
This building takes advantage of both high-energy efficiency and energy
generation from both solar and wind, to create a ZEB design.In the US, ZEB research is currently being
supported by the US Department of Energy Building America Program, (http://www1.eere.energy.gov/buildings/building_america/).This group includes five industry-based
consortia and researchers at the National Renewable Energy Laboratory (NREL),
the Florida Solar Energy Center (FSEC), Lawrence Berkeley National Laboratory
(LBNL), and Oak Ridge National Laboratory (ORNL).There are many other exciting Net Zero developments going on in
the US, just Google Net Zero. This document
was produced by the Putney Energy Committee, to encourage green development in
NET ZERO Information from Wikipedia online- used by Daniel Hoviss – PEC chair and
Putney Town Energy Coordinator.