Transcript Home Ventilation

Energy Efficient Building Design
&
Indoor Air Quality
Principles of Energy Efficient
House Design
• Insulation
• Windows
• Draughtproofing
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Orientation
Zoning
Thermal Mass
Cross Ventilation
• Landscaping
• Efficient heating
system
• Efficient hot water
system
• Efficient lighting
and appliances
Air Leakage
• Factors which determine rate of air leakage
are:
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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
space)
– 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
House
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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
House
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
vent (per wk)
10.0
Floor cleaning (30.52)
1.3
Occupants normal breathing &
respiration
38.0
Total Volume of humidity per
week
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
efficiency.
• Highly energy efficient home – 0.5 to 0.25
achnat.
• 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
natural
• 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
‘tighter’
Poor air quality – stuffiness, odours,
increase in dustmite, mould.
 Poor combustion in gas appliances, wood
heaters
Poor performance from exhaust systems
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
Venmar Heat Recovery
Ventilator
Useful Websites
– www.sustainability.vic.gov.au
– www.buildingcommission.com.au
– www.greenhouse.gov.au/energyefficiency/buildi
ng/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)
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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)
Venmar Heat Recovery Ventilator
• Provides ‘fresh air’ to
all areas of your
home
• 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
envelope
• Heavy weather sites – coastal,
elevated.
• Inner city locations – noise, security,
outdoor air pollution