Sustainable house
It is fact, that now days households
and other living areas in which people live, or reside most of the time,
contribute CO2 emission and green house effects as much as
global warming, which threatens to all humans and their health, as well as
natural resources which balance is disturbed a long time ago. Sustainable house
or Green house or Eco House is one of possible solutions, which with one part
can contribute in solving of this global burning issue.
There
is a question, how this house, or what makes it good for living! That is house
which is energy efficient by itself, environmentally healthy, respectful for
the natural environment, comfortable for family life, in other words to be
sustainable designed, built of green or recycled materials, and this house
should use alternative energy resources.
In the broad
context, sustainable architecture seeks to minimize the negative environmental
impact of buildings by enhancing efficiency and moderation in the use of
materials, energy, and development space. Most simply, the idea of
sustainability, or ecological design, is to ensure that our actions and
decisions today do not inhibit the opportunities of future generations.This
term can be used to describe an energy and ecologically conscious approach to
the design of the built environment.
Sustainable
homes have three key elements.
1. Environmental sustainability
The
house is designed to reduce greenhouse gas
emissions, save water and energy and reduce waste
during
construction and the house’s lifetime.
2. Social sustainability / universal
design
The
house is designed to prevent injuries through built-in
safety
features. It has security elements to reduce crime
and
improve the occupants’ sense of security. Features
are
also used to provide flexibility and comfort for people
of
varying abilities and at different life stages, including
children
and people with limited mobility.
3. Economic sustainability
The
house is designed to save money during construction
and
over the lifetime of the house. Careful planning avoids
the
need for major future renovations and reduces costs
associated
with energy use, water use and maintenance.
www1.indstate.edu/facilities/sustainability/
Building
placement
One central
and often ignored aspect of sustainable architecture is building placement.
Although many may envision the ideal environmental home or office structure as
an isolated place in the middle of the woods, this kind of placement is often
detrimental to the environment. First, such structures often serve as the
unknowing frontlines of suburban
sprawl. Second, they usually increase the energy consumption required
for transportation and lead to unnecessary auto emissions. Ideally, most
building should avoid suburban sprawl in favor of the kind of light urban
development. Careful mixed use zoning can make
commercial, residential, and light industrial areas more accessible
Social
sustainability in architecture
The building
structure must also be considered. Cost/effectiveness is an important issue in
sustainable architecture projects, and one of the most efficient designs herein
is the Public
housing approach. This approach lets everyone have their
own sleeping/recreation
space, yet incorporate communal spaces eg. Mess halls,
Latrines,
public showers...
Sustainable design can help to
create a sustainable way of living within a community. While the existing
social constructs can be seen to influence architecture, the opposite can also
be true. An overtly socially sustainable building, if successful, can help
people to see the benefit of living sustainably. The same
can be said for environmentally sustainable design, in that architecture can
lead the way for the greater community.
Art can be a
powerfully positive social force. It can help to reduce stress in many
situations, lowering the risk of stress-related health problems, both physical
and mental.
Sustainable
energy
The passive house
standard combines a variety of techniques and technologies to achieve ultra-low
energy use.
Energy
efficiency over the entire life cycle of a
building is the most important single goal of sustainable architecture.
Architects use many different techniques to reduce the energy needs of
buildings and increase their ability to capture or generate their own energy.
Heating,
Ventilation and Cooling System Efficiency
The
most important and cost effective element of
an efficient heating,
ventilating, and air conditioning system
is a well insulated
building. A more efficient building requires
less heat generating or dissipating power, but may require more ventilation
capacity to expel polluted indoor air.
Significant
amounts of energy are flushed out of buildings in the water, air and compost
streams. Off the shelf,
on-site energy recycling technologies can effectively recapture energy from
waste hot water and stale air and transfer that
energy into incoming fresh cold water or fresh air. Recapture of energy for
uses other than gardening from compost leaving buildings requires centralized anaerobic digesters.
Site
and building orientation have some major effects on a building's efficiency.
Passive solar building design
allows buildings to harness the energy of the sun efficiently without the use
of any active solar
mechanisms such as photovoltaic
cells or solar hot water panels.
Typically passive solar
building designs incorporate materials with high thermal mass that retain
heat effectively and strong insulation that works
to prevent heat escape. Low energy designs also requires the use of solar
shading, by means of awnings, blinds or shutters, to relieve the solar heat
gain in summer and to reduce the need for artificial cooling. In addition, low energy buildings typically
have a very low surface area to volume ratio to minimize heat loss. This means
that sprawling multi-winged building designs (often thought to look more
"organic") are often avoided in favor of more centralized structures.
Windows
are placed to maximize the input of heat-creating light while minimizing the
loss of heat through glass, a poor insulator. In the northern hemisphere this
usually involves installing a large number of south-facing windows to collect
direct sun and severely restricting the number of north-facing windows. Certain
window types, such as double or triple glazed insulated
windows with gas filled spaces, provide much better insulation than
single-pane glass windows. Preventing excess solar gain by means of solar
shading devices in the summer months is important to reduce cooling needs. Deciduous
trees are often planted in front of windows to block
excessive sun in summer with their leaves but allow light through in winter
when their leaves fall off. Light shelves are installed to allow the sunlight in
during the winter (when the sun is lower in the sky) and keep it out in the
summer (when the sun is high in the sky). Evergreen plants are often planted to the
northbuildings to shield against cold north winds.
In
colder climates, heating systems are a primary focus for sustainable
architecture because they are typically one of the largest single energy drains
in buildings.
In
warmer climates where cooling is a primary concern, passive solar designs can
also be very effective. Masonry
building materials with high thermal
mass are very valuable for retaining the cool
temperatures of night throughout the day. In addition builders often opt for
sprawling single story structures in order to maximize surface area and heat
loss. Buildings are often designed to capture and channel existing winds,
particularly the especially cool winds coming from nearby bodies of
water. Many of these valuable strategies are employed
in some way by the traditional architecture
of warm regions, such as south-western mission buildings.
In
climates with four seasons, an integrated energy system will increase in
efficiency: when the building is well insulated, when it is sited to work with the forces of
nature, when heat is recaptured (to be used immediately or stored),
when the heat plant relying on fossil fuels
or electricity is greater than 100% efficient, and when renewable
energy is utilized.
Alternative
energy Systems
Solar Panels
Active solar
devices such as photovoltaic solar panels help to
provide sustainable electricity for any use. Electrical output of a solar panel
is dependent on orientation, efficiency, latitude, and climate— solar gain
varies even at same latitude. Typical efficiencies for commercially available
PV panels range from 4% to 28%. The low efficiency of certain photovoltaic
panels can significantly effect the payback period of their installation.Roofs are
often angled toward the sun to allow photovoltaic panels to collect at maximum
efficiency. For any solar panel, a true-south facing orientation maximizes
yield. If true-south is not possible, solar panels can produce adequate energy
if aligned within 30° of south. However, at higher latitudes, winter energy
yield will be significantly reduced for non-south orientation.
To
maximize efficiency in winter, the collector should be angled above horizontal
Latitude + 15°. To maximize efficiency in summer, the angle should be Latitude
- 15°. However, for an annual maximum production, the angle of the panel above
horizontal should be equal to its latitude.
creativegreenius.wordpress.com/.../
www.inhabitat.com/.../10/solar-panel-roof-tiles
www.lipower.org/Efficiency/solar-works.html
Wind
Turbines
Wind turbine systems for homes are one of the more cost effective forms of generating electricity from a renewable energy source if you have the right site. Wind turbines begin operating when winds reach 8 mph, achieve energy production capacity at speeds of 32-37 mph, and shut off to avoid damage at speeds exceeding 55 mph. The energy potential of a wind turbine is proportional to the square of the length of its blades and to the cube of the speed at which its blades spin. Though wind turbines are available that can supplement power for a single building, because of these factors, the efficiency of the wind turbine depends much upon the wind conditions at the building site. For these reasons, for wind turbines to be at all efficient, they must be installed at locations that are known to receive a constant amount of wind (with average wind speeds of more than 15mph), rather than locations that receive wind sporadically. A small wind turbine can be installed on a roof. Installation issues then include the strength of the roof, vibration, and the turbulence caused by the roof ledge. Small-scale rooftop wind turbines have been known to be able to generate power from 10% to up to 25% of the electricity required of a regular domestic household dwelling. Turbines for residential scale use are available. They are usually approximately 7 feet (2 m) to 25 feet (8 m) in diameter and produce electricity at a rate of 900 watts to 10,000 watts at their tested wind speed. It is possible to have a system which only gets it power from wind, however, many people combine getting power from a wind turbine with getting power from a solar electric system. The two technologies are often complimentary: when there's little sun (e.g. during the winter or when it's overcast), there's often more wind and vice versa.
Typical Wind turbine for installaion
on houses www.wsmweather.co.uk/?p=1375
www.wsetech.com/windturbinegenerator.php
Solar Water
Heating
Solar water heaters—also called
solar domestic hot water systems—can be a cost-effective way to generate hot
water for your home. They can be used in any climate, and the fuel they
use—sunshine—is free .
There
are two types of solar water systems- active and passive.There are
also two types of circulation, direct circulation systems and indirect
circulation systems. Direct circulation systems loop the domestic water through
the panels. They should not be used in climates with temperatures below
freezing. Indirect circulation loops glycol or some other fluid through the
solar panels and uses a heat exchanger to heat up the domestic water.
The
two most common types of collector panels are Flat-Plate and Evacuated-tube.
The two work similarly except that evacuated tubes do not convectively lose
heat, which greatly improves their efficiency (5%-25% more efficient). With
these higher efficiencies, Evacuated-tube solar collectors can also produce
higher-temperature space heating, and even higher temperatures for absorption
cooling systems.
Electric-resistance
water heaters that are common in homes today have an electrical demand around
4500 KWh/year. With the use of solar collectors, the energy use is cut in half.
The up-front cost of installing solar collectors is high, but with the annual
energy savings, payback periods are relatively short.
makeitsolar.com
www.petervaldivia.com/.../energy/solar-power.php
www.humboldt.edu/.../andySP2002/swh.html
Home Solar Water Heating www.urbansprout.co.za/article/ethical_consume
Geothermal Heat Pumps
Geothermal energy is the heat from the
Earth. It's clean and sustainable. Resources of geothermal energy range from
the shallow ground to hot water and hot rock found a few miles beneath the
Earth's surface, and down even deeper to the extremely high temperatures of
molten rock called magma. Air-source heat pumps (ASHP) can be
thought of as reversible air conditioners. Like an air conditioner, an ASHP can
take heat from a relatively cool space (e.g. a house at 70°F) and dump it into
a hot place (e.g. outside at 85°F). However, unlike an air conditioner, the
condenser and evaporator of an ASHP can switch roles and absorb heat from the
cool outside air and dump it into a warm house.
Air-source
heat pumps are inexpensive relative to other heat pump systems. However, the
efficiency of air-source heat pumps decline when the outdoor temperature is
very cold or very hot; therefore, they are only really applicable in temperate
climates.
For
areas not located in temperate climates, ground-source (or geothermal) heat
pumps provide an efficient alternative. The difference between the two heat
pumps is that the ground-source has one of its heat exchangers placed
underground—usually in a horizontal or vertical arrangement. Ground-source
takes advantage of the relatively constant, mild temperatures underground,
which means their efficiencies can be much greater than that of an air-source
heat pump. The in-ground heat exchanger generally needs a considerable amount
of area. Designers have placed them in an open area next to the building or
underneath a parking lot.
Energy
Star ground-source heat pumps can be 40% to 60% more efficient than their
air-source counterparts. They are also quieter and can also be applied to other
functions like domestic hot water heating.
In
terms of initial cost, the ground-source heat pump system costs about twice as
much as a standard air-source heat pump to be installed. However, the up-front
costs can be more than offset by the decrease in energy costs. The reduction in
energy costs is especially apparent in areas with typically hot summers and
cold winters.
Other
types of heat pumps are water-source and air-earth. If the building is located
near a body of water, the pond or lake could be used as a heat source or sink.
Air-earth heat pumps circulate the building’s air through underground ducts.
With higher fan power requirements and inefficient heat transfer, Air-earth
heat pumps are generally not practical for major construction.
arizonageology.blogspot.com/2008/10/tax-credi.
www.geosyndicate.com/GHP/pages/heatpump.htm
Rainwater collectors
As water conservation becomes more
important, people look to use water more wisely. Using rain water can be a
simple and effective way to cut down on household water usage and save money.
The key to a rain water collection system is a rain barrel. You can then
collect it in a barrel or tank once it comes down through the roof gutter
system. Then you can use the water for your garden, or if you want to use
the water for drinking, you'll want to read more about methods of filtering and
cleaning the water (common methods include UV light, ozone, and chlorination).
Rainwater systems are simple to construct from inexpensive local materials, and
are potentially successful in most habitable locations. Roof rainwater is
usually of good quality and does not require treatment before consumption.
Household rainfall catchment systems are appropriate in areas with an average
rainfall greater than 200mm per year. Roof catchment systems channel rainwater
that falls onto a roof into storage via a system of gutters and pipes. The
first flush of rainwater after a dry season should be allowed to run to waste
as it will be contaminated with dust, bird droppings etc. Roof gutters should
have sufficient incline to avoid standing water. They must be strong enough,
and large enough to carry peak flows. Storage tanks should be covered to
prevent mosquito breeding and to reduce evaporation losses, contamination and
algal growth. Rainwater harvesting systems require regular maintenance and
cleaning to keep the system hygienic and in good working order.
A
domestic rooftop rainwater harvesting system
www.lakotawatercompany.com/.../view/16/28/
Typical Rainwatre system www.res-devon.co.uk/rainwater-harvesting.asp
Greywater systems
Greywater is wastewater from bathtub,
shower drain, sinks, washing machines, and dishwashers. Greywater accounts for
60% of the outflow produced in homes. It contains little or no pathogens and
90% less nitrogen than black water (toilet water). Because of this, it does not
require the same treatment process. By designing plumbing systems to separate
it from blackwater, greywater can be recycled for irrigation, toilets, and
exterior washing, resulting in water conservation. When planned into new
residential construction, the home's wastewater treatment system can be
significantly reduced, resulting in cost and space savings.
Systems generally consist of a
three-way diverter valve, a treatment assembly such as a sand filter, a holding
tank, a bilge pump, and an irrigation or leaching system. The holding tank
cools the water and temporarily holds it back from the drain hose. Systems can
either be custom designed and built, or purchased as a package. Techniques
include recessed or raised planter soilboxes, water injection without erosion,
gravity or pressure leach chamber, and irrigated greenhouses. Some system
components can retrofit existing irrigation systems.
Typical greywater system www.humboldt.edu/~sej26/CCAT/grey.html
Buildins Mass
The mass of a building (often referred
to as 'thermal mass' in relation to energy efficiency) is a building's capability
to absorb, store and regulate heat internally.
Buildings with a high mass take a long
time to warm up and then long time to cool down. Buildings with low mass heat
up quickly, but give up their heat-gain quickly, too.
Concrete, stone, brickwork, and timber
have a high density, making them ideal for high-mass buildings; areas with
large windows and wide air spaces heat up and cool down quickly.
Energy-efficient homes use high-mass
materials. This is a natural energy efficiency technique as it keeps the
building cool in the scorching summer months and keeps the heat indoors in
cooler winter months. If you want your home to be energy efficient, build,
extend or renovate using high-mass materials. This means that the solar gain
during the day will be absorbed and released slowly overnight. Building solid
walls (or stone floors with dark colored tiles) behind south-facing windows
will help to create natural 'heaters' in your home: they will absorb the heat
through the window during the day and release the heat overnight.
Another advantage of high-mass
buildings is that they experience a much lower temperature fluctuation between
day and night: this will make your home more comfortable to live in, reduce
your heating and cooling costs and make more efficient use of your water heater
and some other high-consumption appliances (e.g. refrigerators and freezers).
Building materials typically considered to be 'green' include rapidly renewable plant
materials like bamboo (because bamboo grows quickly) and straw, lumber from
forests certified to be sustainably managed, ecology blocks, dimension
stone, recycled stone, recycled metal, and other products that are
non-toxic, reusable, renewable, and/or recyclable (e.g. Trass, Linoleum,
sheep wool, panels made from paper flakes, compressed earth block, adobe, baked
earth, rammed earth, clay, vermiculite, flax linen, sisal, seagrass, cork,
expanded clay grains, coconut, wood fibre plates, calcium sand stone, concrete
(high and ultra high performance, roman self-healing concrete).
Walls
The materials
common to many types of natural building are clay and sand. When mixed with
water and, usually, straw or another fiber, the mixture may form cob or adobe (clay blocks). Other materials commonly
used in natural building are: earth (as rammed earth or earth bag),
wood (cordwood
or timber frame/post-and-beam),
straw, rice-hulls, bamboo and rock. A wide variety of
reused or recycled materials are
common in natural building, including urbanite (salvaged chunks of used
concrete), tires, tire bales, discarded bottles and other recycled glass.
Several other
materials are increasingly avoided by many practitioners of this building
approach, due to their major negative environmental or health impacts. These
include unsustainably-harvested wood, toxic wood-preservatives, portland cement-based
mixes, paints and other coatings which off-gas volatile organic compounds (VOCs), and some plastics,
particularly polyvinyl
chloride (PVC or "vinyl") and those containing harmful
plasticizers or hormone-mimicking formulations.
A wall is a
usually solid structure that defines and sometimes protects an area. Most
commonly, a wall delineates a building and supports its superstructure, separates
space in buildings into rooms,
or protects or delineates a space in the open air. There are three principal types of
structural walls: building walls, exterior boundary walls, and retaining walls.
www.avilionhomes.com
Cob or cobb is a building material
consisting of clay, sand, straw, water, and earth, similar to adobe. Cob is fireproof, resistant to seismic
activity, and inexpensive. It can be used to create artistic, sculptural forms
and has been revived in recent years by the natural building and sustainability movements. Cob
is an ancient building material, that may have been used for construction since
prehistoric timesCob structures can be found in a variety of climates across
the globe.
Cob House
farm3.static.flickr.com
Adobe
is a type of mudbrick also used today to save energy and is an
environmentally safe way to insulate a house. This type of house tends to stay
cool in the summer and warm in the winter.Adobe is a natural
building material made from sand, clay, and water, with some
kind of fibrous or organic material (sticks,
straw, dung), which is shaped
into bricks using frames and dried in the sun. It is similar to cob
and mudbrick.
Adobe structures are extremely durable and account for some of the oldest
extant buildings on the planet.In hot climates, compared to
wooden buildings, adobe buildings offer significant advantages due to their
greater thermal mass,
but they are known to be particularly susceptible to seismic damage in an event
such as an earthquake.
Adobe /
Mud brick
www.ecobob.co.nz/_ImgUser
Cordwood construction is a term used for a natural
building method in which "cordwood" or short lengths pieces of
debarked tree are laid up crosswise with masonry or cob mixtures to build a
wall. The cordwood, thus, becomes infill for the walls, usually between posts
in a timber frame structure.
Cordwood masonry can be combined with other methods (e.g., rammed earth, cob or light
clay) to produce attractive combinations. Cordwood masonry construction
provides a relatively high thermal mass,
which makes it easy to heat and coo.
Cordwood construction
home-n-stead.com/.../page1_blog_entry15_1.
Rammed earth, also known as
taipa, pisé de terre or simply pisé, is a technique used in the building of
walls using the raw materials of mud, chalk, lime and gravel. It is an ancient building method that has
seen a revival in recent years as people seek more sustainable building materials and natural building methods.
Because of the nature of the materials used it is incombustible, thermally
insulating and very strong and hardwearing. It also has the added
advantage of being a simple way to construct walls. Traditionally, rammed earth
buildings are common in arid regions where wood is in scarce supply.
Because rammed earth structures
utilize locally available materials, they typically have a low embodied energy rating and
generate very little waste. Earth used for building is a widely-available
resource and harvesting it for use in construction has minimal environmental
impact.
Rammed earth interior
www.treehugger.com/rammed-earth
Timber framing is now a modern method of
construction, Ideally suited to mass house building as well as public
buildings. In conjunction with a number of natural insulations and timber
cladding or modern lime renders, it is possible to quickly construct a high
performance, sustainable building, using completely natural products. The
benefits are many — the building will perform better over its lifespan, waste
is reduced (much can be re-cycled, composted or used as fuel). Timber frame
structures are frequently used in combination with other natural building
techniques, such as cob, straw bale, or cordwood/masonry. Advantages:the use of timber framing in
buildings offers various aesthetic and structural benefits the timber frame
structure goes up quickly in its modern incarnation the timber frame can give
the home owner the ability to make a creative statement through the use of
design and specialty touches like carvings of favorite quotes and incorporating
timbers from heirloom structures, like a barn from a family
homestead.Disadvantages: some possible disadvantages of wood as opposed to some
other building materials include: Noise from footsteps in adjacent rooms above,
below, and on the same floor in such buildings can be quite audible. The
possibility of infestation by insects such as termites,
cockroaches or powder post beetles, or by other pest animals such as mice
and rats.
Wood burns more readily than some other materials,
making timber-frame buildings somewhat more susceptible to fire damage,
although this idea is not universally accepted.
Timber frame www.timberstructures.net
Straw-bale construction is a building
method that uses bales of straw
(commonly wheat, rice, rye and oats straw) as structural elements, insulation,
or both. This construction method is commonly used in natural building or
"green" construction projects. Straw-bale construction has some
advantages over conventional building systems because of the renewable nature
of straw, its cost, easy availability, and its high insulation value.
Straw-bale construction www.supergreenme.com
Floors
Sustainable flooring is produced from
sustainable materials (and by a sustainable process) that reduces demands on ecosystems during its
life-cycle. This includes harvest, production, use and disposal. It is thought
that sustainable flooring creates safer and healthier buildings and guarantee a
future for traditional producers of renewable
resources that many communities depend on. Below are examples of
available, though less well-known, eco-friendly flooring options.
Sustainable flooring www.ecofriend.org
Bamboo
flooring
is made from a fast growing renewable timber (technically grass). It is natural
anti-bacterial, water-resistant and extremely durable.
Bamboo
flooring www.ukflooringdirect.co.uk/news/bamboo-based
Cork flooring is made by removing the bark of the Cork Oak (Quercus Suber)
without harming the tree (if harvested correctly); it is a truly renewable
resource. It is naturally anti-microbial and has excellent insulation
properties, ensuring minimal heat loss and comfortable warm walking surface.
Cork is resilient and ‘springs back’ preventing imprints due to heavy traffic
and furniture, it also provides excellent noise insulation. Cork is low in VOC (volatile organic compound) emissions,
however it is important to check the finish applied. Cork is not suitable for
bathrooms, as it absorbs moisture.
Cork
flooring www.furniturehomedesign.com/.../flooring
Linoleum is made from dried and milled flax
seeds mixed with other plant material (pine resins, wood flour, ground cork)
with a jute backing, all completely natural materials which come from renewable
sources and are 100% biodegradable. All by products and waste is milled and
used. Linoleum does not fade, as the pigments are embedded in the structure. It
is anti-static, repelling dirt, dust and other small particles, making it
hypoallergenic – for this reason it is often used by people with respiratory
issues (asthma, allergies). It is also fire-resistant and does not require
additional fire-retardants finish.
Linoleum Flooring www.essentialdevelopments.com/flooring.php
Rubber flooring is made from a rubber tree, a 100%
renewable resource. It is easy to install and maintain, is anti-static and
provides effective sound insulation and vibration reduction. Rubber flooring is
also resistant to fading and cigarette burns. Some rubber flooring is made from
synthetic rubber, this is not a sustainable product.
Rubber flooring www.ehow.com/way_5460070_recycled-flooring-id.
Natural and
Recycled Carpet. There are carpets that are sustainable, using natural fibers
such as sisal, wool, jute and coconut husk. It is also possible to have carpet
made completely from recycled polyethylene terephthalate
used for food/drink containers. This is sustainable and it reduces material
sent to landfill; further it uses dyeing methods that are less polluting and
require less energy than other flooring. This flooring is sustainable when used
alongside eco-friendly adhesive as some products may have toxic finishes added
(stain/fire proofing) that are not considered to be sustainable.
Recycled Carpet www.durablecorp.com/.../d/u/duraridge2.jpg
Windows
Window Frames
Frames can significantly affect a
windows performance, depending on the type of frame material. Wood frames are
energy efficient, and can be sourced from a certified sustainable supplier, but
can also be expensive and need to be painted regularly to protect them from
water damage. Fibreglass frames are low maintenance and energy-efficient but
can also be expensive. Aluminium frames are inexpensive but conduct heat easily
and are therefore less energy efficient than other options.
One of the most popular materials for
framing is PVC, also called uPVC, and PVCu. These are made from vinyl and are
inexpensive, energy efficient and low maintenance. They do not need to be painted
and are highly resistant to moisture. Some vinyl frames have been insulated to
give improved thermal performance.
Frame of
Wood
www.efficientwindows.org/images/frame_wood.gif
Frame of Recycled PVC
www.buildingdesign-news.co.uk/2009/images-200..
Window
Glazing
Energy efficient windows have two or
more panes of glass separated by an air gap to slow heat transfer and provide
noise insulation. These are known as double paned or insulated windows.
Traditionally air or dry nitrogen was used between the panes, but recent models
use low conductance gas fills of argon or krypton that gives even better
thermal performance and significantly lowers the U-value.
Another new development in window
technology is low-emittance coating also known as low-e. These are
microscopically thin layers of metal or metallic oxide that are coated onto the
window glazing. Different types of coating have different properties, but all
are designed to lower heat flow through the window - some reflect heat back
into the building and others reflect heat back outside.
Spacers are used in between the layers
of glass in a window, to hold them together at the required distance.
Conventional spacers were made from aluminium, but because of their high
conductivity they provided poor thermal insulation and created condensation
problems around the window edges. New spacer products, known as warm spacer
technology, or warm edge spacers, have been developed from materials that have
a low conductivity rate and high thermal efficiency, and include fiberglass,
vinyl, silicone foam and reinforced thermoplastic. Some warm edge spacers
incorporate a thermal break in their structural design.
Window technology has undergone a
revolution in the last twenty years. Using a combination of gas filled
double-glazing, glass coatings, thermally improved edge spaces and PVC framing
it is now possible to adjust solar gain, reduce condensation, prevent air
leakage and improve the comfort of an indoor environment while offering the
homeowner huge savings in energy and money. More importantly, energy efficient
windows reduce carbon emissions and help to address global climate change. Used
in combination with other green building methods and materials, they are a good
choice for a brighter, sustainable future.
Double-pane Windows
- These energy efficient windows can reduce heating bills by 34% in cold
climates, and 38% in warm climates. www.uwsp.edu/.../double-pane%20window.j
www.seriouswindows.com/assets/images/SW_cutaw..
Roofs
A roof is the covering on the
uppermost part of a building.
A roof protects the building and its contents from the effects of weather. The
characteristics of a roof are dependent upon the purpose of the building that
it covers, the available roofing materials and the local traditions of
construction and wider concepts of architectural design and practice and may
also be governed by local or national legislation.
The elements
in the design of a roof are:
-the material
-the construction
-the durability
The material
of a roof may range from banana leaves, wheaten straw or seagrass
to lamininated glass, aluminium
sheeting and precast concrete. In many parts of the world ceramic
tiles
have been the predominant roofing material for centuries.
Japan, rice straw
thatch.
In selecting material for roof
covering one should take into account its weight (heavier material requires
larger support members), its durability (e.g. how well can it tolerate high and
low temperatures and for how long), its effect on water falling on the roof if
the water is being captured (for example, will gravel from shingles build up
sediment in a cistern or do roof materials leach into the water?), the
heat-holding qualities of the roof material (does it heat up and stay hot into
the night?), as well as cost, fire rating, maintainability, and installation
characteristics.
Slate, clay, and cementitious roof
materials offer excellent durability but are heavy. Fiber-cement composite roof
materials are somewhat lighter and use fiber materials resourcefully. Some use
waste paper as well as wood fiber. Many have 60 year warranties.
Natural Slate Roof
www.bestroofcompanies.com/images/stories/guid
Metal roof materials, steel and
aluminium contain high percentages of recycled content, up to 100% in many
aluminum products. An additional advantage is that these materials are easily
recycled in their post-use as well as lightweight and durable.
Metal Roof
metal-roof.blogspot.com/2008/11/building-gree
Asphalt shingles use recycled, mixed paper in their
base and some use reclaimed minerals in the surface aggregate. This type of
material does not last as long as the others mentioned above. Recycled plastic
roof materials are starting to be introduced as a lightweight option.
wmroofing.ca/site/assets/images/burlayers.
The construction
of a roof is determined by its method of support and how the underneath space
is bridged and whether or not the roof is pitched. The pitch is the angle at
which the roof rises from its lowest to highest point. Most domestic architecture,
except in very dry regions, has roofs that are sloped, or pitched. The pitch is
partly dependent upon stylistic factors, but has more to do with
practicalities. Some types of roofing, for example thatch, require
a steep pitch in order to be waterproof and durable. Other types of roofing,
for example pantiles,
are unstable on a steeply pitched roof but provide excellent weather protection
at a relatively low angle. In regions where there is little rain, an almost
flat roof with a slight run-off provides adequate protection against an
occasional downpour.
The durability
of a roof is a matter of concern because the roof is often the least accessible
part of a building for purposes of repair and renewal, while its damage or
destruction can have serious effects.
A roofing system that can deliver high
solar
reflectance (the ability to reflect the visible, infrared and ultraviolet wavelengths of
the sun, reducing heat transfer to the building) and high thermal emittance (the
ability to radiate absorbed, or non-reflected solar energy) is a cool
roof. Most cool roofs are white or other light colors.
A green
roof is a roof of a building that is partially
or completely covered with vegetation and soil, or a growing medium, planted over a
waterproofing membrane. It may also include additional layers such as a root
barrier and drainage and irrigation systems. Also known as “living roofs,”
green roofs serve several purposes for a building, such as absorbing rainwater,
providing insulation, creating a habitat for wildlife, and helping to lower
urban air temperatures and combat the heat island
effect.
There are two types of green roofs:
intensive roofs, which are thicker and can support a wider variety of plants
but are heavier and require more maintenance, and extensive roofs, which are
covered in a light layer of vegetation and are lighter than an intensive green roof.
Green
roof www.naturalbalancedevelopment.com/.../msl/6.gif
Green Roof www.santamonicapropertyblog.com/wp-content/up.
Green Insulation
Because it is hidden in our walls,
most of us do not really think about insulation or what it’s made of. But more
and more people are looking to “green” options for insulating their homes and
buildings, not only because it’s healthier for the occupants, but also because
the manufacture and use of green insulation is better for the environment.
Mainstream insulation can contain fiberglass, formaldehyde, and other toxic
components. Here are some examples of eco-friendly, healthy insulation
materials.
Jeans - Yes, jeans – as in blue jeans. Some insulation companies recycle the waste denim from blue jeans manufacturers and make it into insulation. This cotton fiber is as effective as fiberglass, and works for thermal as well as noise insulation. It is treated with borate, a non-toxic chemical that does not outgas and acts as a fire retardant and mold inhibitor.
Wool -Another
common clothing item, wool makes excellent insulation. You have the option of
having it treated chemically to reduce the risk of insect infestation. It has
been used successfully without being so treated, and if you want to avoid
chemicals altogether, you can try it untreated. Wool is naturally resistant to
fire.
Mineral Wool
www.lowenergyhouse.com/glass-wool.htm
Sheep Wool Insulation www.natureproinsulation.co.uk/sheepswool.htm
Sheep Wool Insulation www.natureproinsulation.co.uk/sheepswool.htm
Cellulose is made from recycled
or finely-shredded newspaper. There are options as to its installation: it can
be blown into crevices and walls, and it’s also available in boards and pads.
It is also chemically treated with non-toxic substances to reduce
susceptibility to fire and mold.
Cellulose
Insulation
www.applegateinsulation.com/
Hemp
- Naturally resistant to insects, hemp does not need to be chemically treated
with insecticide. It is fairly dense and offers insulating properties similar
to wool.
Hemp insulation www.hemcore.co.uk/insulation.htm
Straw
- One of the oldest insulators, straw is making a comeback. Tightly-bound bales
are stacked within wall studs and covered with plaster. Baled in this way,
straw is fire-resistant but prone to moisture absorption, so it’s not a good
option for humid climates.
Stawe
bale insulation
article-niche.com/launch/Straw-Bale-Construct.
Spray
foam - There are such things as eco-friendly, spray foam insulations.
Water-based spray is a mix of carbon dioxide and water, and it is sprayed into
spaces where it swells and fills the space like traditional, synthetic foams.
Another kind of spray foam insulation is made with a combination of
naturally-derived magnesium dioxide and compressed air. It is mold and fire
resistant, and is particularly good insulation against noise.Whether you are
re-insulating an existing home or building your own structure from the ground
up, there are quite a few options for non-toxic insulation that will improve
your indoor air quality and be easier on the planet.
Spray
Foam insulation www.sacramento-home-repairs.com/images/spray
Earth - Earth is one of the best
insulators.
Natural
insulation - earth
Eco Friendly Gardens and Landscapes
There are
a number of sensible reasons to employ the use of 'eco friendly' garden and
landscape techniques when you build or develop your home.
www.thisoldhouse.com/.../0,,20235479,00.html
Protection
from the Sun
Creating shade around your home by the
use of trees and shrubs is the perfect way to prevent excess heat from entering
your home through windows and roofs, especially in exceptionally hot climates.
Keeping the interior of your home cooled down naturally will save energy by reducing
the amount of air conditioning required to cool the indoor living areas.
Water
Conservation
Water conservation is of primary
concern, especially in Mexico's hotter climates and desert regions. The use of
certain breeds of grass as well as alternative landscaping materials that don't
require water (e.g. bark chipping, pebble stones) will provide you with a means
to create an attractive landscape around your home without the need to use up
scarce water supplies.
Wind
Breaks
Wind breaks help to prevent the wind
from carrying heat away from your house, in climates where indoor heat
preservation is desirable. The most common form of wind breaks are shrubs and
vines planted to divert winds away from the house walls. Another technique is
to use 'earth breaks' by either creating mounds of earth in strategic places or
using the land's natural topography to create wind breaks for the house.
Reducing
Electricity Consumption
By employing the use of solar-powered
lighting for your garden (if you use garden lights, buy the stand-alone type
which charge up during the daylight and use that stored power to illuminate the
bulb at night) and reducing the amount of water required in your garden,
especially in areas where water is more scarce, energy may be conserved through
less us of electricity (e.g. water pumps, water delivery to your home,
sprinkler systems). A carefully thought-out garden and landscape can provide
beautiful surroundings for your home and save energy. See the Landscape ecology
link at the foot of this guide for more details.
www.inharmony.com/dillman.html
Sources:
www.wikipedia.com
www.earthbagbuilding.wordpress.com
www.totalinsulationsolutions.co.uk
www.thegreen-home-living.com
www.petervaldivia.com
www.dreamgreenhomes.com
www.planet
friendly.net