Sustainable architecture, is a general term that describes environmentally-conscious design techniques in the field of architecture. Sustainable architecture is framed by the larger discussion of
sustainabilityand the pressing economic and political issues of our world. 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.
Energy efficiencyover the entire life cycleof 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 (HVAC) 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
compoststreams. 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 a major effect on a building's HVAC efficiency.
Passive solar building designallows buildings to harness the energy of the sun efficiently without the use of any active solarmechanisms such as photovoltaic cells or solar hot water panels. Typically passive solarbuilding designs incorporate materials with high thermal massthat retain heat effectively and strong insulation that works to prevent heat escape. Low energy designs also requires the use of (mobile) 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. Traditional cold climate buildings such as American colonial saltboxdesigns provide a good historical model for centralized heat efficiency in a small scale building. 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 and low emissivity (low-E) coatings, 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 treesare 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. Louvers or 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 high in the sky). Coniferousor evergreen plants are often planted to the north of buildings 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 massare 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 energyis utilized.
Alternative energy production
Active solardevices such as photovoltaicsolar panels help to provide sustainable electricity for any use. Roofs are often angled toward the sun to allow photovoltaic panels to collect at maximum efficiency, and some buildings even move throughout the day to follow the sun. The Samundra Institute of Maritime Studies (SIMS) at Lonavala, near Pune India, has the longest photovoltaic wall in the world, at over ninety meters long. Undersized wind turbines (normal turbines are often over 250 feet) may have been oversold and do not always provide the returns promised, particularly for North American households. [ [http://www.wind-works.org/articles/SmallWindTurbineSizetoMeetHouseholdConsumption.html Small Wind Turbine Size to Meet Household Consumption ] ] Active solar water heatingsystems have long provided heating-specific energy in a sustainable manner. Occasionally houses that use a combination of these methods achieve the lofty goal of "zero energy" and can even begin generating excess energy for use in other structures: for example the Kingspan Lighthouse project by BRE.
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 consumptionrequired for transportation and lead to unnecessary auto emissions. Ideally, most building should avoid suburban sprawl in favor of the kind of light urban development articulated by the New Urbanistmovement. Careful mixed use zoning can make commercial, residential, and light industrial areas more accessible for those traveling by foot, bicycle, or public transit, as proposed in the Principles of Intelligent Urbanism.
ustainable building materials
Some examples of sustainable building materials include recycled
denimor blown-in fiber glass insulation, sustainably harvested wood, Trass, Linoleum, [Duurzaam en Gezond Bouwen en Wonen by Hugo Vanderstadt] sheep wool, panels made from paper flakes, baked earth, rammed earth, clay, vermiculite, flax linnen, sisal, seegrass, cork, expanded clay grains, coconut, wood fibre plates, calcium sand stone, locally-obtained stone and rock, and bamboo, which is one of the strongest and fastest growing woody plants, and non-toxic low-VOC glues and paints.
Architectural salvage and reclaimed materials are used when appropriate as well. When older buildings are demolished, frequently any good wood is reclaimed, renewed, and sold as flooring. Any good
dimension stoneis similarly reclaimed. Many other parts are reused as well, such as doors, windows, mantels, and hardware, thus reducing the consumption of new goods. When new materials are employed, green designers look for materials that are rapidly replenished, such as bamboo, which can be harvested for commercial use after only 6 years of growth, or cork oak, in which only the outer bark is removed for use, thus preserving the tree. When possible, building materials may be gleaned from the site itself; for example, if a new structure is being constructed in a wooded area, wood from the trees which were cut to make room for the building would be re-used as part of the building itself.
Lower Volatile Organic Compounds
Low-impact building materials are used wherever feasible: for example, insulation may be made from low VOC (
volatile organic compound)-emitting materials such as recycled denim or cellulose insulation, rather than the building insulation materialsthat may contain carcinogenic or toxic materials such as formaldehyde. To discourage insect damage, these alternate insulation materials may be treated with boric acid. Organic or milk-based paints may be used. [Information on low-emitting materials may be found at www.buildingecology.com/iaq_links.php [http://www.buildingecology.com/iaq_links.php IAQ links] ] However, a common fallacy is that "green" materials are always better for the health of occupants or the environment. Many harmful substances (including formaldehyde, arsenic, and asbestos) are naturally occurring and are not without their histories of use with the best of intentions. A study of emissions from materials by the State of California has shown that there are some green materials that have substantial emissions whereas some more "traditional" materials actually were lower emitters. Thus, the subject of emissions must be carefully investigated before concluding that natural materials are always the healthiest alternatives for occupants and for the Earth. [Building Emissions Study accessed at [http://www.ciwmb.ca.gov/GreenBuilding/Specs/Section01350/METStudy.htm California Integrated Waste Management web site] ]
Volatile organic compounds (VOC) can be found in any indoor environment coming from a variety of different sources. VOCs have a high vapor pressure and low water solubility and are suspected of causing sick building syndrome type symptoms. This is because many VOCs have been known to cause sensory irritation and central nervous system symptoms characteristic to sick building syndrome, indoor concentrations of VOCs are higher than in the outdoor atmosphere, and when there are many VOCs present, they can cause additive and multiplicative effects.
Green products are usually considered to contain less VOCs and be better for human and environmental health. A case study conducted by the Department of Civil, Architectural, and Environmental Engineering at the University of Miami that compared three green products and their non-green counterparts found that even though both the green products and the non-green counterparts both emitted levels of VOCs, the amount and intensity of the VOCs emitted from the green products were much safer and comfortable for human exposure. [James,J.P., Yang,X. Indoor and Built Environment, Emissions of Volatile Organic Compounds from Several Green and Non-Green Building Materials: A Comparison, January 2004. [http://ibe.sagepub.com/cgi/reprint/14/1/69] Retrieved: 2008-04-30.]
Sustainable architecture focuses on the on-site use of waste, incorporating things such as
grey watersystems for use on garden beds, and composting toilets to reduce sewage. These methods, when combined with on-site food waste composting and off-site recycling, can reduce a house's waste to a small amount of packaging waste.
Re-using structures and materials
Some sustainable architecture incorporates recycled or second hand materials. The reduction in use of new materials creates a corresponding reduction in
embodied energy(energy used in the production of materials). Often sustainable architects attempt to retro-fit old structures to serve new needs in order to avoid unnecessary development.
ocial sustainability in architecture
Architectural design can play a large part in influencing the ways that social groups interact. Communist Russia's Constructivist
Social condensers are a good example of this, buildings which were designed with the specific intention of controlling or directing the flow of everyday life to "create socially equitable spaces". Sustainable designcan 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; this can be seen in many of Rural Studio's buildings in and around Hale County, Alabama, and in the design of ALA Himmelwright's "model fireproof farmhouse," located at Rock Lodge Clubin Stockholm, New Jersey. 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. Art can also be a way of individual expression, which can add to the community as a whole.
Hundertwasser's buildings in Austria are an inspiring example of art giving back to the community.
Designers noted for their contribution to sustainable architecture
Ashok "Bihari" Lall
Brenda and Robert Vale
Hellmuth, Obata and Kassabaum
Madan Lal Dhingra
Sim Van der Ryn
Sustainable architecture, it can be argued, does not rigorously form a part of architecture as a discipline. Rather, it is a concern in the building construction industry as a whole, and given the dominance of construction techniques and building subsystems, it should be considered a part of
civil engineeringas a discipline. Numerous schools of architecture shun "sustainable architecture" as a part of their curriculum, and it is considered to be a fashionablesubject at the moment. A number of architects practicing this type of architecture have been criticized as exploiting a dominant concern in the name of architecture in order to gain reputability and garner profits.Fact|date=October 2007
Fab Tree Hab: 100% Ecological Home
Passive solar design
Principles of Intelligent Urbanism
Sustainable landscape architecture
Sustainable Building Alliance
* [http://www.umich.edu/~nppcpub/resources/compendia/architecture.html Sustainable Architecture] information from the
University of Michigan
* [http://www.thenextstandard.org the NEXT Building Standard]
* [http://www.usgbc.org US Green Building Council-- leading source for green design/building information]
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