house as a system
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1
HOUSE AS A SYSTEMSteps to Healthier Homes
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LEARNING OBJECTIVE
IDENTIFY three important housing systems that contribute to a comfortable living space.
Page 3.1
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Page 3.1WHAT’S A HOUSE?
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Page 3.2
HOMES SHELTER US FROM: Animals and
insectsWind
Sun
Rain (sleet, snow)
Cold or hot air
Dust
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Phoenix
San Francisco
Seattle
Anchorage
Honolulu
Billings Saint Paul
WichitaHouston
Cleveland
Boston
Denver DC
Atlanta
Miami
Tulsa
MarquetteBangor
Saint John
Salt Lake
Nashville
Los Angeles
New Orleans
Saint Louis
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MOST OF US ARE COMFORTABLE: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
Page 3.2
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WE HAVE SYSTEMS TO:Add heatRemove heatVentilateMaybe add or remove humidity
Page 3.3
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HEATING SYSTEMS Fuel – gas, oil, wood, electric Distribution
Hot water, steam, warm air, space heaters Radiators, baseboard, ducts Radiant floors and ceilings
Chimneys, sealed combustion, fan powered Temperature Controls
Page 3.3
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Furnace
Hot water heater
Cooling coil
Intake for furnace
Heat recovery ventilator
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Octopus heating system
Page 3.4
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Floor furnaces
Page 3.5
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Gas-fired wall furnace
Page 3.5
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Heat Exchangers
Page 3.6
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COOLING SYSTEMSFuel – electricWindows, fans and shadesDistribution
Central airThrough the wallDuct-less splits
DehumidificationAir conditioners/part-loadDehumidifiers
Control – thermostat, humidity
Page 3.6
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Page 3.7
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Page 3.7
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INTERNAL AND SOLAR GAINS:
Heat from peopleHeat from appliancesSolar through windowsAverage US house
23% of heating is done by these gains 59% of cooling is caused by these gains
Good when cold out; bad when hot outPage 3.8
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OTHER FACTORSWater
drinking, cooking, washing, toilets
Cooking and storing foodVentilating fans
LightingComputers, stereos, hair dryers, razors
Page 3.8
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LEARNING OBJECTIVE
IDENTIFY three important housing systems that contribute to a comfortable living space.
Page 3.8
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