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					Energy Efficient Building Design
       Indoor Air Quality
    Principles of Energy Efficient
            House Design
                        • Landscaping
• Insulation
                        • Efficient heating
• Windows                 system
                        • Efficient hot water
• Draughtproofing         system
•   Orientation         • Efficient lighting
•   Zoning                and appliances
•   Thermal Mass
•   Cross Ventilation
                 Air Leakage
• Factors which determine rate of air leakage
  –   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
           Why Ventilate?
• To assist in cooling a space
• Occupant Health
  – to improve indoor air quality (refresh
  – to control excess humidity
Minimising Resistance to Ventilation
Ventilation - Exhaust Only Fan,
  Bath Fan or Range Hood
Ventilation - Supply Only
Ventilation - Balanced System with
      Heat/Energy Recovery
Main Sources of Pollution Inside a
•   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
Main Sources of Humidity Inside a
Activity (family of 4)                      Litres/Week
Cooking (3 meals a day for 1 wk)            6.3

Dishwashing (3 times/day for 1 wk           3.2

Bathing (showers & baths)                   2.4

Washing (per wk)                            1.8

Drying clothes indoors or use of external   10.0
vent (per wk)
Floor cleaning (30.5 2)                     1.3

Occupants normal breathing &                38.0

Total Volume of humidity per                63.0 litres
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
• Highly energy efficient home – 0.5 to 0.25
• North American code (ASHRAE) 0.35 achnat
Blower Door -
 Air Leakage
 Testing Unit
          JG King Homes
       Miner‟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
• Tightest Australian residential building
  tested to date.
New UK Building Regulations
introduced April 2006 (to meet
    Climate Change targets)

“Build Tight – Ventilate Right”
        Indoor Air Quality
• Issues to deal with as homes become
  Poor air quality – stuffiness, odours,
   increase in dustmite, mould.
   Poor combustion in gas appliances, wood
  Poor performance from exhaust systems
 Venmar Whole-Home Heat Recovery
  Ventilation & Air Filtration System

• Complements Highly Energy Efficient
• 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
Venmar Heat Recovery
         Useful Websites
– (5 Star rating for timber-floored dwellings)
– (Commercial GreenStar Rating)
– (Healthy Building consultants)
– (HRV/ERV technology)
– (non-toxic floor covering)
– (LED lighting)
– (non-toxic paints/finishes)
Venmar Heat Recovery Ventilator
• Provides „fresh air‟ to
  all areas of your
• Removes pollutants &
  moisture from
  kitchen, bathrooms
  and laundry
• filters incoming air
• Shift temperature
  around building
• Overcomes negative
  pressure problems
• Recovers Energy
  (up to 80%)
      Why utilise Heat/Energy
       Recovery Ventilation
• manage indoor air quality
• 5 Star Energy Efficient Home
• To maintain energy efficiency of building
• Heavy weather sites – coastal,
• Inner city locations – noise, security,
  outdoor air pollution