Annual fuel utilization efficiency (original) (raw)
The annual fuel utilization efficiency (AFUE; pronounced 'A'-'Few' or 'A'-'F'-'U'-'E') is a thermal efficiency measure of space-heating furnaces and boilers. The AFUE differs from the true 'thermal efficiency' in that it is not a steady-state, peak measure of conversion efficiency, but instead attempts to represent the actual, season-long, average efficiency of that piece of equipment, including the operating transients. It is a dimensionless ratio of useful energy output to energy input, expressed as a percentage. For example, a 90% AFUE for a gas furnace means it outputs 90 BTUs of useful heating for every 100 BTUs of natural gas input (where the rest may be wasted heat in the exhaust). A higher AFUE means higher efficiency.
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| dbo:abstract | The annual fuel utilization efficiency (AFUE; pronounced 'A'-'Few' or 'A'-'F'-'U'-'E') is a thermal efficiency measure of space-heating furnaces and boilers. The AFUE differs from the true 'thermal efficiency' in that it is not a steady-state, peak measure of conversion efficiency, but instead attempts to represent the actual, season-long, average efficiency of that piece of equipment, including the operating transients. It is a dimensionless ratio of useful energy output to energy input, expressed as a percentage. For example, a 90% AFUE for a gas furnace means it outputs 90 BTUs of useful heating for every 100 BTUs of natural gas input (where the rest may be wasted heat in the exhaust). A higher AFUE means higher efficiency. The method for determining the AFUE for residential furnaces and boilers is the subject of ASHRAE Standard 103. A furnace with a thermal efficiency (ηth) of 78% may yield an AFUE of only 64% or so, for example, under the standard's test conditions. When estimating annual or seasonal energy used by combustion devices, the AFUE is the better efficiency measure to use in the calculations. But for an instantaneous fuel consumption rate, the thermal efficiency may be better. Note that the theoretical limit for a conventional furnace's instantaneous efficiency is 100%, whereas a heat pump used for building heating may exceed 100%. For example, a COP of 1.5 is equivalent to 150%. Heat pumps are readily available for electric and gas sources. So from a theoretical perspective, in some use cases the name "efficiency" may be misleading. (en) |
| dbo:wikiPageExternalLink | https://web.archive.org/web/20190816010850/https:/www.cmhc-schl.gc.ca/en/co/maho/enefcosa/upload/wood_heating_EN_W.pdf http://www.cmhc-schl.gc.ca/en/co/maho/enefcosa/upload/wood_heating_EN_W.pdf |
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| dbo:wikiPageWikiLink | dbr:Propane dbr:Electric_heating dbr:HSPF dbr:Thermal_efficiency dbr:Furnace_(house_heating) dbr:Boiler dbr:Heating_oil dbr:ASHRAE dbr:Air_source_heat_pump dbr:Energy_efficiency_ratio dbr:Geothermal_heat_pump dbr:Natural_gas dbr:Heat_pump dbc:Heating,_ventilation,_and_air_conditioning dbr:Coefficient_of_performance dbr:Seasonal_energy_efficiency_ratio dbr:Waste_heat dbr:Firewood dbr:British_Thermal_Units dbr:Air-Conditioning,_Heating,_and_Refrigeration_Institute |
| dbp:wikiPageUsesTemplate | dbt:Short_description dbt:Mech-engineering-stub |
| dcterms:subject | dbc:Heating,_ventilation,_and_air_conditioning |
| gold:hypernym | dbr:Measure |
| rdf:type | dbo:Software |
| rdfs:comment | The annual fuel utilization efficiency (AFUE; pronounced 'A'-'Few' or 'A'-'F'-'U'-'E') is a thermal efficiency measure of space-heating furnaces and boilers. The AFUE differs from the true 'thermal efficiency' in that it is not a steady-state, peak measure of conversion efficiency, but instead attempts to represent the actual, season-long, average efficiency of that piece of equipment, including the operating transients. It is a dimensionless ratio of useful energy output to energy input, expressed as a percentage. For example, a 90% AFUE for a gas furnace means it outputs 90 BTUs of useful heating for every 100 BTUs of natural gas input (where the rest may be wasted heat in the exhaust). A higher AFUE means higher efficiency. (en) |
| rdfs:label | Annual fuel utilization efficiency (en) |
| owl:sameAs | freebase:Annual fuel utilization efficiency wikidata:Annual fuel utilization efficiency https://global.dbpedia.org/id/4RPjf |
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