Green building materials

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Green building materials

  1. 1. Green Building Materials and Techniques
  2. 2. Green building <ul><li>Focuses on increasing the efficiency of resource use –energy, water and materials. </li></ul><ul><li>While reducing impacts on human health </li></ul><ul><li>And environment during the Lifecycle, through better siting, design construction and operation. </li></ul>
  3. 3. <ul><li>Emphasis on: </li></ul><ul><li>Reduced energy use – Efficient and alternative sources which are less polluting </li></ul><ul><li>Reduced waste- Reutilising our industrial and agricultural wastes </li></ul>
  4. 4. <ul><li>“ The Environmental impact of building is often underestimated, while the perceived costs of green buildings are overestimated” </li></ul>
  5. 5. Why eco-friendly materials? <ul><li>Phenomenal growth in the construction industry that depends upon depletable resources. </li></ul><ul><li>Production of building materials leads to irreversible environmental impacts. </li></ul>
  6. 6. What is Eco-friendly material ? <ul><li>Dictionary: describes a product that has been designed to do the least possible damage to the environment </li></ul><ul><li>US EPA – EPP program defines as: “ products or services that have a lesser or reduced effect on human health and the environment when compared with competing products or services that serve the same purpose...” </li></ul>
  7. 7. SOURCES <ul><li>A) Renewable source – Rapidly renewable sources e.g. wood from certified forests </li></ul><ul><li>B) Reuse of Waste - Salvaged products –e.g. old plumbing, door frames </li></ul><ul><li>C) Recycled contents – agriculture/ industrial waste e.g. Firbreboard Board </li></ul>
  8. 8. Reclaimed materials <ul><li>Construction materials account for: </li></ul><ul><li>420 million tonnes of material consumption (7 tonnes per person) </li></ul><ul><li>20% of the UK’s total ecological footprint </li></ul><ul><li>19% of the UK’s total greenhouse gas emissions </li></ul><ul><li>30% of all UK road freight </li></ul>
  9. 9. UK’s total greenhouse gas emissions Greenspec ® Reclaimed Materials Article - http://www.greenspec.co.uk/reclaimed-materials.php
  10. 10. Why Use Reclaimed Materials <ul><li>Substitution of reclaimed materials for new will radically reduce the environmental impact of that particular item. </li></ul><ul><li>It removes the need to extract more raw materials and it largely removes the need for processing and manufacture. </li></ul><ul><li>Transportation impacts are usually reduced too as reclaimed materials tend to be sourced locally (although not always).  </li></ul>
  11. 11. BRE life cycle analyses comparing new with reclaimed Greenspec ® Reclaimed Materials Article - http://www.greenspec.co.uk/reclaimed-materials.php
  12. 12. Greenspec ® Reclaimed Materials Article - http://www.greenspec.co.uk/reclaimed-materials.php
  13. 13. Potential for reclaimed <ul><li>Waste from construction and demolition produces a massive, virtually untapped, sustainable resource. Salvo estimate that only 1% of building materials are currently from reclaimed sources. Whereas some 5-10% of the building materials demand could potentially be met from reclaimed. (Salvo, A Reclamation Protocol, 1995).   Diverting and re-using salvaged materials from the waste stream maintains them as a high grade resource instead of down grading them by crushing or chipping. </li></ul>
  14. 14. Embodied Energy <ul><li>Total energy input required to produce the product including transporting them to the building site . </li></ul><ul><li>Aluminum and steel has the most embodied energy because to the high energy required to produce them. Compared to timber that requires very less energy for production. </li></ul>
  15. 15. This shows relative carbon emissions for three common building materials. Please note that emissions data are based on metric tons (1000 Kg) of each material.
  16. 16. Reduce Pollution <ul><li>Air Pollution - Use of materials with low VOC emissions e.g. Cement Paints </li></ul><ul><li>Water Pollution – Materials that prevent leaching. </li></ul><ul><li>Land Pollution - Materials that reuse waste that would otherwise have resulted in landfill e.g. Fly ash Bricks . </li></ul>
  17. 17. Energy Conservation <ul><li>Materials that require less energy during construction e.g. precast slabs . Materials that help reduce the cooling loads- e.g – aerated concrete blocks. </li></ul><ul><li>Products that conserve energy – e. g. CF lamps. (compact fluorescent lamps ) </li></ul><ul><li>Fixtures & equipments that help conserve water e.g. Dual flush cisterns </li></ul>
  18. 18. Performance <ul><li>Materials can be eco-friendly based on how they perform. Use of certain material or techniques can reduce the amount of material required. </li></ul><ul><li>Durability – The longer the life of a material the lesser it is required to replace and thus reduces the quantity required to produce. </li></ul>
  19. 19. Advantages of GREEN Buildings vs. Conventional Buildings <ul><li>Cost Savings (Ongoing Operating Expense Reductions) </li></ul><ul><li>Minimize Impact on Environment </li></ul><ul><li>Enhanced Health & Productivity of Occupants </li></ul><ul><li>Increased Value & Lease-Up Rates </li></ul><ul><li>Community & Social Benefits </li></ul><ul><li>Other Owner Benefits (Lender Incentives; Tax Abatements; Etc.) </li></ul>
  20. 20. Myths Surrounding Green Buildings <ul><li>They are too complicated </li></ul><ul><li>“We're not already building green!” </li></ul><ul><li>Over hyping benefits and performance </li></ul><ul><li>Cost Perceptions </li></ul><ul><li>Too expensive and has no ROI </li></ul><ul><li>Initial costs not recaptured in long term </li></ul><ul><li>Costs too high to warrant </li></ul>
  21. 21. Myths Surrounding Green Buildings Performance Expectations <ul><li>Green automatically reduce expenses </li></ul><ul><li>It costs less to build and maintain </li></ul><ul><li>More green, more operating problems </li></ul>
  22. 22. LIMITATIONS OF GREEN BUILDING <ul><li>Initial Cost- Some materials costs are higher </li></ul><ul><li>Funding –Some lenders will not offer loan </li></ul><ul><li>Availability of materials </li></ul><ul><li>Location </li></ul><ul><li>Time frame needed – Materials take more time </li></ul>
  23. 23. Nanotechnologies and Green Buildings <ul><li>A study commissioned by the nanotechnology group of the UK's Department for Environment Food and Rural Affairs (Defra) looked into the policy implications of nanotechnologies that will benefit the environment. </li></ul><ul><li>Five nanotechnology applications were subject to detailed investigation: fuel additives, solar cells, the hydrogen economy, batteries and insulation. </li></ul>
  24. 24. Fuel additives <ul><li>Nanoparticle additives increase the fuel efficiency of diesel engines by approximately 5% which could result in a maximum saving of 2-3 millions of tonnes (Mte) per annum of CO2 in the UK. </li></ul><ul><li>Concerns about the health impact of free nanoparticles in diesel exhaust gases. </li></ul>
  25. 25. Solar cells <ul><li>Nanotechnology may deliver benefits in significantly decreasing the cost of production of solar cells. </li></ul><ul><li>Conservatively, if a distributed solar generation grid met 1% of the UK's electricity demand, approximately 1.5 Mte per annum of CO2 could be saved. </li></ul><ul><li>The major barrier to this technology is the </li></ul><ul><li>incorporation of the nanotechnology into </li></ul><ul><li>the solar cell, not the nanotechnology itself. </li></ul><ul><li>Lack of skills to transfer the science base </li></ul><ul><li>into workable prototypes. </li></ul>
  26. 26. Batteries and Supercapacitors <ul><li>Nanotechnology may provide a remedy to the charge time problem by allowing electric vehicles to be recharged in much more quickly. </li></ul><ul><li>If low carbon electricity generation techniques are used, CO2 from private transport could be eliminated (resulting in a maximum potential saving of 64 Mte per annum) </li></ul><ul><li>or, using the current energy mix, maximum </li></ul><ul><li>savings of 42 Mte per annum of carbon </li></ul><ul><li>dioxide could be made. </li></ul><ul><li>Without nanotechnology, electric vehicles </li></ul><ul><li>are likely to remain a niche market due to </li></ul><ul><li>the issues of charge time </li></ul>
  27. 27. Insulation <ul><li>No easy methods for insulating solid walled buildings, which currently make up approximately one third of the UK’s housing stock. </li></ul><ul><li>Nanotechnology may provide a solution which, if an effective insulation could be found with similar properties to standard cavity insulation, could result in emission reductions equivalent to a maxim potential of 3 Mte per year. </li></ul><ul><li>Ultra thin films on windows to reduce heat loss already exist on the market. There are claims that nano-enabled windows are up to twice as efficient as required by current building standards. </li></ul><ul><li>However, industry believes that significant further insulative savings in glass maybe made instead using aerogels, which themselves are nanostructures. </li></ul>
  28. 28. ISSE Green Products <ul><li>The ISSE is evaluating and commissioning research via nanotechnology and reclaimed materials technologies for a solution to the increasing level of environmental damage caused by the construction industry </li></ul><ul><li>As the information and concept is commercially sensitive no information can be provided here. </li></ul>
  29. 29. <ul><li>http://www.nanowerk.com/spotlight/spotid=2225.php </li></ul><ul><li>http://www.greenspec.co.uk/reclaimed-materials.php </li></ul>

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