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Ppt of green building

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Ppt of green building

  1. 1. introduction • Green building (also known as green construction or sustainable building) refers to both a structure and the using of processes that are environmentally responsible and resource-efficient throughout a building's life-cycle: from siting to design, construction, operation, maintenance, renovation, and demolition.[1] In other words, green building design involves finding the balance between homebuilding and the sustainable environment. This requires close cooperation of the design team, the architects, the engineers, and the client at all project stages.[2] The Green Building practice expands and complements the classical building design concerns of economy, utility, durability, and comfort.[3] • Leadership in Energy and Environmental Design (LEED) is a set of rating systems for the design, construction, operation, and maintenance of green buildings which was Developed by the U.S. Green Building Council. Other certificates system that confirms the sustainability of buildings is British BREEAM is the Building Research Establishment Environmental Assessment Method for buildings and large scale developments. Currently World Green Building Council is doing research on how green buildings affect health and productivity of their users.
  2. 2. • Although new technologies are constantly being developed to complement current practices in creating greener structures, the common objective is that green buildings are designed to reduce the overall impact of the built environment on human health and the natural environment by: • Efficiently using energy, water, and other resources • Protecting occupant health and improving employee productivity • Reducing waste, pollution and environmental degradation[3] • A similar concept is natural building, which is usually on a smaller scale and tends to focus on the use of natural materials that are available locally.[4] Other related topics include sustainable design and green architecture. Sustainability may be defined as meeting the needs of present generations without compromising the ability of future generations to meet their needs.[5] Although some green building programs don't address the issue of the retrofitting existing homes, others do, especially through public schemes for energy efficient refurbishment. Green construction principles can easily be applied to retrofit work as well as new construction. • A 2009 report by the U.S. General Services Administration found 12 sustainably designed buildings cost less to operate and have excellent energy performance. In addition, occupants were more satisfied with the overall building than those in typical commercial buildings.These are eco friendly buildings
  3. 3. history • Individuals and companies have only been building green homes for the past thirty years; still, within that time, the green movement has been constantly growing. The history of green building dates back much further than the 1970's. It was in the midst of the industrial revolution that Henri Becquerel first witnessed the transformation of solar energy into electrical energy, known as photovoltaic power. Around this time, the late 1800's to early 1900's, a number of solar power plants were built to utilize the sun's energy for steam power. Then, in the 1950's, solar energy was used on an extremely small-scale, making way for the solar panel solution twenty years later.
  4. 4. • During the energy crisis of the 1970's, green building moved from research and development to reality. Builders and designers were looking for a way to reduce the reliance of buildings and homes on fossil fuels. Solar panels were used to make more environmentally friendly homes, although only in small numbers due to high initial costs. • Since then, developers have been able to construct more efficient and less expensive solar panels, making solar energy more of a reality. Also, during this transition period, designers and consumers started wondering, if solar panels can make buildings more efficient, lower energy bills, and reduce the negative impact on the environment, what other steps can be taken to build even greener homes? Now, Eco construction involves so much more than simply using solar panels.
  5. 5. • Aside from harnessing the earth's richest energy source — sunlight — green builders and designers examine a number of issues to make a building Eco- friendly. Building materials are a huge concern. Even today, the building industry in the United States uses up forty percent of all raw materials. Any reduction through the use of sustainable, recycled materials will have a huge impact on resource preservation. • Durability is another issue; if environmentally-friendly materials need to be replaced frequently, then they become less and less efficient.
  6. 6. advantage • • Cost • Very often green building is considered to be expensive as usually all kind of modern building methods. However it saves much more money from the moment of creating during its lifetime as ordinary buildings. It works with any kind of green structures – office buildings, schools, churches, factories and others type of buildings. Designing and building green structures cost approximately the same as regular buildings. Even if they are higher in cost a little bit, because of some special requirements, during their usage they save so much energy that the money spent on its creation will return at least 10 times. The Californian Sustainable Building Task Force carried out a study in 2003. According to this study even 20% of investment into green building will elaborate 10 times more saving. So there is no significant difference in prices. A green building can be expensive as much as a conventional building. • • Energy efficiency • Green building has a great advantage of reducing both embodied and operating energy consumption. Studies proved that those buildings which are built with wood will have a lower embodied energy than buildings made of brick, steel or other materials. What about operating energy? Designers try to find solutions to reduce it too. They use extra-insulation, high- performance windows, and passive solar design. The latter is very efficient especially if the windows are effectively placed. Also other ways of renewable energy are used too. Wind power and hydro power can also notably reduce the influence on environment.
  7. 7. • • Water efficiency • Water consumption is another objective in sustainable building. Water can be wasted by drip irrigation, leaking (toilet leaking can waste up to 90 gallons per day), pool showers. Recycling rainwater and using it for toilet flushing can save waste-water. Water saving shower heads, ultra-low flush toilets and other conserving fixtures can minimize waste-water. • • Material efficiency • Green buildings are built from green, rapidly renewable, non-toxic, reusable and recyclable materials as lumber, bamboo, straw, recycled metal/stone, sheep wool, compressed earth block, concrete, cork etc. • • Temperature Regulation • Urban heat islands are elevated temperatures mostly in urban areas, formed mostly on surfaces where permeable and moist became impermeable and dry due to some buildings, roads etc. Urban heat island effect is caused mostly by the heat holding properties of tall buildings and urban (often toxic) materials – asphalt, concrete. It can be compensated by more green areas around the buildings such as green roofs and rain gardens.
  8. 8. • • Indoor air quality • When constructing green buildings great emphases are put on the ventilation system. It can be powered in different ways – passively, naturally or mechanically. It doesn’t matter in which it is powered, the most important thing that a building should have a properly designed ventilation system in order to have a filtered andcleanerair. During construction low or zero emission materials are used. Most materials used for ordinary buildings are toxic, some of them radiate gases or include volatile organic compounds. It has a bad influence on occupant’s health and productivity. According to the data of the US Environmental Protection Agency indoor air pollution can be 2-5 times worse than outdoor air quality. It can cause early asthma and other respiratory disease. It is provoked by radon gas that’s found in conventional buildings. Another considerable feature of air quality is the control of dampness. If ventilation from bathrooms, kitchen and other isolated rooms is bad, it can lead to mold growth, dust mites or to the emergence of other bacteria. To avoid this problem effective ventilation system is not always enough; well-insulated building envelop is also needed. • • Indoor environment quality • Except poor air quality other circumstances like poor lightening, temperature variances, furniture, carpeting, pesticides, paints and high concentration of pollutants are causing different diseases – headaches, dermatological problems, allergies etc. The environmentally friendly circumstances of green building create healthier atmosphere. • • Maintenance • Green buildings need less maintenance. For example most green buildings don’t require exterior painting so often. Also as far as natural sources were used during its construction, they are not destroyed so quickly
  9. 9. • • Improved Employee Attendance and Productivity • Natural lightening, good ventilation, healthy circumstances all influence the health of green structures’ occupants. People are becoming less sick, they are more productive and their impact on work is more high and effective. A study made in Seattle among 31 green buildings showed that in LEED-certified buildings the absence of employee was decreased into 40 percent. Another research showed 30 percent less sick days plus a 10 percent growth income per employee. This way green office is more attractive and retaining for employees. • • Higher Property Value • Green buildings have low energy cost. Their use of gas, water, energy is highly reduced. A building can keep a high sale value if it contains sustainable components. • A green building can be easily tuned into a net zero building. A net zero building or zero energy home is an active house. Instead of spending money on it, you can earn money with it. These buildings have almost zero consumption. Moreover they can create more energy than they need, they can supply energy(electricity) back into the electrical grid.
  10. 10. • • Tax benefits • Tax provisions are initiated to improve energy efficient green buildings.It is supported on local, state and federal level. In the Economic Stimulus Act of 2008, PL 110-185 (ESA), the Housing Assistance Tax Act of 2008, PL 110-289 (HATA), the Emergency Economic Stabilization Act of 2008, PL 110-343 (EESA), and the American Recovery and Reinvestment Act of 2009, PL 111-5 (ARRA) you can find what kind of estate they are included. • • Improved Retail Sales • A survey in the state of California proved that if stores are lighted with skylights/natural light, the personage of sale is increased into 40%. The conclusion is that retailers using daylight can reduce their electrical costs.
  11. 11. Disadvantage • • Air-cooling features • Particular cooling components that control precisely the indoor temperature in green buildings don’t exist. The only thing that influences it is natural ventilation, which cannot be regulated. • • Location • To amend sun exposure, green building may need a correct structural orientation. It influences how natural light enters the building, how to shade some part of it. As far as the building will contain recycled resources the location of the building is affected by the land’s humidity, the circumstance of the surrounding area. • • Availability of materials • In urban areas materials can be found easily than in rural areas. Green buildings require special materials. A lot of eco-friendly materials re not available in the US, so sometimes these materials are hard to find and transportation fees may be high. If you order them from the internet you should pay additional cost for shipping and handling. • • Time • To build a green building in some cases takes more time than an ordinary one. Sometimes it takes too much time to find the needed material.The client can delay the construction
  12. 12. • • Green roofs • Green roofs consist of several layers plus a vegetation layer, culture medium, drainage, isolation, waterproofing membrane, and roof support. Green roofs are heavier than simple once, so the roof’s strength should be improved in order to construct this type of roof correctly. • • Cost • Many believe that the cost of green building is cost-prohibitive. You need to invest a lot of money. However later with energy saving possibilities the invested money may come back. • • Low indoor quality • Green buildings are eco-friendly and healthy, but too much emphases are put on sealing them. This isolation may cause indoor pollution. It can be harmful to the health of the occupants. Damage to health can also cause fluorescent lights. Their radiation in isolated places can lead to health problems.
  13. 13. Compared with convectional building • Global climate change has become more apparent over the last few decades. Although the pace, extent and concrete outcome is uncertain, the direction of climate change is clear. Most climate experts agree that the humans, at least in part, cause this development. The experts are calling for immediate and far- reaching action to fight global warming and remedy its consequences. • Buildings have a lot to do with our external and internal environment, and have a major impact on both our health and the health of future generations. Due to the benefits, builders are opting for Green buildings over conventional buildings. Are green buildings really better in comparison to conventional buildings? Experts share their opinion over different aspects covering both, green and conventional building.
  14. 14. • Technology Both conventional and green buildings look alike from outside, yet regarding type of technology used and benefits rendered, they are poles apart. The main objective of green buildings is to reduce energy and water consumption, recycling of waste, using eco-friendly materials, etc. On the other hand, conventional buildings are typically not designed from the point of view of energy, water, material and indoor environment efficiency. • According to Rumi Engineer, Business Head, Green Building Consultancy Services Godrej & Boyce Ltd, “Primarily, there aren’t much differences in technologies used for construction of green buildings. The same set of technologies is used to build a green as well as non-green building. But when it comes to design, we employ special software to simulate the energy consumption patterns, day light availability and artificial lighting for a green building. These are called Building Simulation services. It helps the project team in selecting building materials for wall and roof, fenestration and electrical and lighting equipment based on their impact on the energy consumption.” • Pankaj Kaushal, Vice President- Architecture, REPL says, “By adopting Green buildings one can contribute in reducing carbon foot print.” Building materials which consume less energy are used in green buildings like AAC (Autoclaved Aerated Concrete) blocks or Cellular Concrete blocks or cavity walls using rigid insulation using fly ash bricks which have low density and are light weight. Whereas conventional buildings have 9-inch (230 mm) brick wall or 8-inch (200 mm) concrete block wall.
  15. 15. • He further added, “When it comes to electricity and lighting, conventional buildings have typical design standards and lighting power in green buildings significantly reduces to less than 8W per qm” • Mala Singh, Chairman and MD, PEC Greening India Group states, “Green building uses sustainable technologies like rain water harvesting, water efficient plumbing fixtures, recycling of wastewater and Reuse etc. which conserves precious water resource. Use of energy efficient lighting, optimised building envelope, green roof technology, energy efficient equipment and technologies like 3-Star or 5-Star labelled products and use of green energy like solar or any other mean are appropriate strategies for energy conservation in green building.”
  16. 16. • Construction cost The rise in green building is not only because of increased environmental awareness, but also because of serious cost benefits. Green building materials and energy efficient equipment may cost more and add a green premium to building costs, but such items pay for themselves through energy savings, increased home comfort and reduced maintenance costs. • Mr Kaushal states, “A study done by California’s Sustainable Building Task Force of 33 Green buildings found an average of 2 per cent construction cost premium associated with certification. However, it also concluded that the minimal increase in upfront costs; mainly attributed to design, would on average; result in 20 per cent savings of total construction costs over the life cycle of the building, Kats et al., (2003). For a builder point of view, the initial additional cost of 2 per cent can be recovered by the end user because ultimately they are going to get benefitted in the longer run.” • By offering green homes, many builders are now meeting their customers’ needs for energy- and water-efficient homes with a healthier environment and financial benefits.
  17. 17. • However Ms Singh feels conventional buildings are more costly, she says, “The conventional ways of construction are more expensive and full of risks like resource wastage, increased energy consumption, inadequate waste disposal etc. leading to more hazards. Green concept uses a well-defined and sustainable approach, which leads to minimal wastage of materials, natural resource conservation by recycling and reuse.” • She further adds, “Unlike conventional buildings, Green buildings adopt strategies with respect to energy, water etc. which helps to avoid over designing the MEP system, which considerably reduces the resource usage, space requirement and construction costs in Green buildings. Hence, conventional buildings are more expensive than green buildings.”
  18. 18. • Sustainability Compared to Conventional buildings, Green building is built upon the principles of environmental, social and economical sustainability by adopting a holistic approach from planning level itself. • Mr Engineer opines, “To sustain the energy and water efficiency measures adopted in a newly constructed building one needs to maintain them. There are Green Building rating systems available in India from USGBC and IGBC that cater to operations and maintenance of existing buildings, both conventional as well as green. By adopting green practices for operations and maintenance, one may easily sustain the green building features adopted during the construction.” • The expression green building and sustainable building are often used interchangeably, though these terms can have different meanings too. Green buildings can be expected to consume less energy and thus consequently generate lower CO2 emissions. • Mr Kaushal says, “Compared to conventional buildings, green buildings have low environmental impact throughout the various phases of a buildings’ life cycle, that is ; from siting to design, construction, operation, maintenance, renovation, and demolition and offers better health and wellbeing for occupants. Hence, they are more sustainable.”
  19. 19. • The end result is a product which is indeed sustainable and environment conscious in nature, having universally accessible design, consuming significantly less energy and water, generating less waste and having improved quality of life. • Green buildings encourages recycling and reuse of resources which finally leads to conserving natural resources, reduce carbon footprint and helps to mitigate impacts of global warming and greenhouse gas emissions. Green buildings help to reduce energy consumption up to 30 - 40 per cent and water savings up to 50 - 60 per cent, all of which is reflected as reduction in electricity bills and reduced water tariffs. • “Sometimes, an efficient way of using green energy like solar, can help to reduce the total energy costs from conventional electricity. These projects can sustain on its own energy generation for the whole lifecycle of the project,” concludes Ms Singh.

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