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3.2 HEATING SYSTEMS - Coggle Diagram
3.2 HEATING SYSTEMS
Heating Systems
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Broadly used to provide space heating with forced air distribution systems. Most common units are required to be 90% or more AFUE. (ANNUAL FUEL UTILIZATION EFFICIENCY)
Annual fuel utilization efficiency(AFUE) ratings for residential gas furnaces and boilers to gage efficient.
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Condensing furnaces have high quality heat exchangers to cool the combustion products below their DEW point, condensing the water vapour in the flue gas and regaining the latent heat.
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Air Source Heat Pump
Extracts heat from the outside air. The colder it is outside, the less heat is available from the heat pump due to the wide temperature difference between the source and the delivery.
Are most efficient when the outside temperature is about 7 degrees celsius, but at that temperature the house requires very little heat.
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Earth Energy Heat Pumps
Also known as geothermal or ground source heat pump systems, use the earth or groundwater as a source of heat in the winter and as a heat sink in the summer for air conditioning.
Wood-fired Space Heating
are available in a variety of forms: Stoves, Furnaces, Boilers, and fireplaces
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Condensing furnaces have high quality heat exchangers to cool the combustion products below their dew point, condensing the water vapour in the flue gas and regaining the latent heat. The resulting low exhaust air temperature typically enables the use of sidewall venting.
Boilers have recently been required to use outdoor resets to monitor outdoor temperature and reduce boiler set point temperatures when space heating loads are lower. Only during the coldest days when the boiler set point temperature has to be raised to its maximum will it become less efficient and potentially not condense.