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Energy Efficient Building Design & Indoor Air Quality

Energy Efficient Building Design & Indoor Air Quality. Principles of Energy Efficient House Design. Insulation Windows Draughtproofing Orientation Zoning Thermal Mass Cross Ventilation. Landscaping Efficient heating system Efficient hot water system Efficient lighting and appliances.

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Energy Efficient Building Design & Indoor Air Quality

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  1. Energy Efficient Building Design & Indoor Air Quality

  2. Principles of Energy Efficient House Design • Insulation • Windows • Draughtproofing • Orientation • Zoning • Thermal Mass • Cross Ventilation • Landscaping • Efficient heating system • Efficient hot water system • Efficient lighting and appliances

  3. Air Leakage • Factors which determine rate of air leakage are: • Temperature difference in and out. • Wind/Exposure • Exhaust Fans • Combustion appliances – wood heaters • Type and Style of building • Weatherboard leaker than brick veneer on concrete slab • Two storey leaker than single storey • Atriums

  4. Why Ventilate? • To assist in cooling a space • Occupant Health • to improve indoor air quality (refresh space) • to control excess humidity

  5. Minimising Resistance to Ventilation

  6. Ventilation - Exhaust Only Fan, Bath Fan or Range Hood

  7. Ventilation - Supply Only

  8. Ventilation - Balanced System with Heat/Energy Recovery

  9. Main Sources of Pollution Inside a House • Mould and spores • Mites and their debris • Dust • Cooking and grease smoke emissions • Pet dander and debris • Smoke from fireplaces and wood-burning stoves • Occupant skin dander • Viruses and bacteria • Fumes from various chemical and cleaning products • Cigarette smoke

  10. Main Sources of Humidity Inside a House

  11. Residential Air Leakage Rates • Older homes as much as 3.0 achnat • Average home in Victoria – 1.49 air changes per hour natural (achnat) (SEAV 1991) • Below 1.0 achnat moving toward energy efficiency. • Highly energy efficient home – 0.5 to 0.25 achnat. • North American code (ASHRAE) 0.35 achnat

  12. Blower Door - Air Leakage Testing Unit

  13. JG King HomesMiner’s Rest 6 Star Plus Display House • Blower Door Pressure-testing conducted by Air Barrier Technologies (23 January 2008) • Result – 0.22 air changes per hour natural • Tightest Australian residential building tested to date.

  14. New UK Building Regulations introduced April 2006 (to meet Climate Change targets) “Build Tight – Ventilate Right”

  15. Indoor Air Quality • Issues to deal with as homes become ‘tighter’ • Poor air quality – stuffiness, odours, increase in dustmite, mould. • Poor combustion in gas appliances, wood heaters • Poor performance from exhaust systems

  16. Venmar Whole-Home Heat Recovery Ventilation & Air Filtration System • Complements Highly Energy Efficient Buildings • Reduces building air leakage through a balanced supply and exhaust of air. • Transfer of up to 80% of heat energy • Protect occupant health (maintain good indoor air quality) • Heat-Shifting capability

  17. Venmar Heat Recovery Ventilator

  18. Useful Websites • www.sustainability.vic.gov.au • www.buildingcommission.com.au • www.greenhouse.gov.au/energyefficiency/building/code.html • www.fwprdc.org.au(5 Star rating for timber-floored dwellings) • www.gbcaus.com(Commercial GreenStar Rating) • www.healthyhouse.com(Healthy Building consultants) • www.air2energy.com.au(HRV/ERV technology) • www.forbo.com.au(non-toxic floor covering) • www.hotbeam.com.au(LED lighting) • www.anrofloorcare.com.au(non-toxic paints/finishes)

  19. Venmar Heat Recovery Ventilator • Provides ‘fresh air’ to all areas of your home • Removes pollutants & moisturefrom kitchen, bathrooms and laundry • filters incoming air • Shift temperature around building • Overcomes negative pressure problems • Recovers Energy (up to 80%)

  20. Why utilise Heat/Energy Recovery Ventilation • manage indoor air quality • 5 Star Energy Efficient Home • To maintain energy efficiency of building envelope • Heavy weather sites – coastal, elevated. • Inner city locations – noise, security, outdoor air pollution

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