Transcript House as a system

Steps to Healthier Homes
HOUSE AS A SYSTEM
1
LEARNING OBJECTIVE
Page
3.1
IDENTIFY three important housing
systems that contribute to a
comfortable living space.
2
WHAT’S A HOUSE?
Page
3.1
3
HOMES SHELTER US FROM:
Page
3.2
Animals and insects
Wind
Sun
Rain (sleet, snow)
Cold or hot air
Dust
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Anchorage
Marquette
Billings
Saint Paul
Bangor
Cleveland
Seattle
Boston
Salt Lake
DC
Denver
Nashville
Saint Louis
San Francisco
Phoenix
Atlanta
Los Angeles
New Orleans
Honolulu
Tulsa
Houston
Wichita
Miami
Saint John
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MOST OF US ARE COMFORTABLE:
Page
3.2
Air temperature:
65° F(active) – 80° F (bathing)
Air relative humidity:
30% – 70%
Air motion:
20 – 40 feet per minute
Surrounding surface temperatures:
within 10 – 15° F of room air
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WE HAVE SYSTEMS TO:
Page
3.3
Add heat
Remove heat
Ventilate
Maybe add or remove humidity
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HEATING SYSTEMS
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3.3
Fuel – gas, oil, wood, electric
Distribution
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Page
Hot water, steam, warm air, space heaters
Radiators, baseboard, ducts
Radiant floors and ceilings
Chimneys, sealed combustion, fan powered
Temperature Controls
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Cooling coil
Heat recovery
ventilator
Hot water heater
Furnace
Intake for furnace
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Page
3.6
Heat Exchangers
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COOLING SYSTEMS
Page
3.6
Fuel – electric
Windows, fans and shades
Distribution
Central air
Through the wall
Duct-less splits
Dehumidification
Air conditioners/part-load
Dehumidifiers
Control – thermostat, humidity
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Page
3.7
12
Page
3.7
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INTERNAL AND SOLAR GAINS:
Good when cold out; bad when hot out
Page
3.8
Heat from people
Heat from appliances
Solar through windows
Average US house
23% of heating is done by these gains
59% of cooling is caused by these gains
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OTHER FACTORS
Water
drinking, cooking, washing, toilets
Cooking and storing food
Ventilating fans
Page
3.8
Lighting
Computers, stereos, hair
dryers, razors
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LEARNING OBJECTIVE
Page
3.8
IDENTIFY three important housing
systems that contribute to a
comfortable living space.
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