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- Thermal_transmittance abstract "Thermal transmittance, also known as U-value, is the rate of transfer of heat (in watts) through one square metre of a structure divided by the difference in temperature across the structure. It is expressed in watts per metres squared kelvin, or W/m²K. Well-insulated parts of a building have a low thermal transmittance whereas poorly insulated parts of a building have a high thermal transmittance. Losses due to thermal radiation, thermal convection and thermal conduction are taken into account in the U-value. Although it has the same units as heat transfer coefficient, thermal transmittance is different in that the heat transfer coefficient is used to soley describe heat transfer in fluids while thermal transmittance is used to simplify an equation that has several different forms of thermal resistances.It is described by the equation:Φ = A × U × (T1 - T2)where Φ is the heat transfer in watts, U is the thermal transmittance, T1 is the temperature on one side of the structure, T2 is the temperature on the other side of the structure and A is the area in square metres.Thermal transmittances of most walls and roofs can be calculated using ISO 6946, unless there is metal bridging the insulation in which case it can be calculated using ISO 10211. For most ground floors it can be calculated using ISO 13370. For most windows the thermal transmittance can be calculated using ISO 10077 or ISO 15099. ISO 9869 describes how to measure the thermal transmittance of a structure experimentally.single glazing: 5.7 W/m²K; single glazed windows, allowing for frames: 4.5 W/m²·K; double glazed windows, allowing for frames: 3.3 W/m²·K; double glazed windows with advanced coatings: 2.2 W/m²·K; double glazed windows with advanced coatings and frames: 1.2 W/m²·K; triple glazed windows, allowing for frames: 1.8 W/m²·K; triple glazed windows, with advanced coatings and frames: 0.8 W/m²·K; well-insulated roofs: 0.15 W/m²·K; poorly insulated roofs: 1.0 W/m²·K; well-insulated walls: 0.25 W/m²·K; poorly insulated walls: 1.5 W/m²·K; well-insulated floors: 0.2 W/m²·K; poorly insulated floors: 1.0 W/m²·K;In practice the thermal transmittance is strongly affected by the quality of workmanship and if insulation is fitted poorly, the thermal transmittance can be considerably higher than if insulation is fitted well".
- Thermal_transmittance wikiPageID "5530574".
- Thermal_transmittance wikiPageLength "8748".
- Thermal_transmittance wikiPageOutDegree "26".
- Thermal_transmittance wikiPageRevisionID "650048079".
- Thermal_transmittance wikiPageWikiLink Area.
- Thermal_transmittance wikiPageWikiLink Category:Thermodynamics.
- Thermal_transmittance wikiPageWikiLink Clay.
- Thermal_transmittance wikiPageWikiLink Concrete.
- Thermal_transmittance wikiPageWikiLink Convective_heat_transfer.
- Thermal_transmittance wikiPageWikiLink Flux.
- Thermal_transmittance wikiPageWikiLink Glass_wool.
- Thermal_transmittance wikiPageWikiLink Glasswool.
- Thermal_transmittance wikiPageWikiLink Heat_transfer_coefficient.
- Thermal_transmittance wikiPageWikiLink ISO_6946.
- Thermal_transmittance wikiPageWikiLink Mortar_(masonry).
- Thermal_transmittance wikiPageWikiLink Multiplicative_inverse.
- Thermal_transmittance wikiPageWikiLink Plaster.
- Thermal_transmittance wikiPageWikiLink R-value_(insulation).
- Thermal_transmittance wikiPageWikiLink Storey.
- Thermal_transmittance wikiPageWikiLink Temperature.
- Thermal_transmittance wikiPageWikiLink Thermal_conduction.
- Thermal_transmittance wikiPageWikiLink Thermal_convection.
- Thermal_transmittance wikiPageWikiLink Thermal_radiation.
- Thermal_transmittance wikiPageWikiLink Thermographic_camera.
- Thermal_transmittance wikiPageWikiLink Watt.
- Thermal_transmittance wikiPageWikiLink Window.
- Thermal_transmittance wikiPageWikiLinkText "Thermal transmittance".
- Thermal_transmittance wikiPageWikiLinkText "thermal transmittance".
- Thermal_transmittance hasPhotoCollection Thermal_transmittance.
- Thermal_transmittance wikiPageUsesTemplate Template:Citation_needed_span.
- Thermal_transmittance wikiPageUsesTemplate Template:Merge_to.
- Thermal_transmittance wikiPageUsesTemplate Template:Reflist.
- Thermal_transmittance subject Category:Thermodynamics.
- Thermal_transmittance hypernym Rate.
- Thermal_transmittance type Ship.
- Thermal_transmittance type Concept.
- Thermal_transmittance type Physic.
- Thermal_transmittance type Thermodynamic.
- Thermal_transmittance comment "Thermal transmittance, also known as U-value, is the rate of transfer of heat (in watts) through one square metre of a structure divided by the difference in temperature across the structure. It is expressed in watts per metres squared kelvin, or W/m²K. Well-insulated parts of a building have a low thermal transmittance whereas poorly insulated parts of a building have a high thermal transmittance.".
- Thermal_transmittance label "Thermal transmittance".
- Thermal_transmittance sameAs انتقالية_حرارية.
- Thermal_transmittance sameAs Wärmedurchgangskoeffizient.
- Thermal_transmittance sameAs Koeficijent_prolaska_topline.
- Thermal_transmittance sameAs Trasmittanza_termica.
- Thermal_transmittance sameAs U-waarde.
- Thermal_transmittance sameAs m.0dr48s.
- Thermal_transmittance sameAs Q359156.
- Thermal_transmittance sameAs Q359156.
- Thermal_transmittance wasDerivedFrom Thermal_transmittance?oldid=650048079.
- Thermal_transmittance isPrimaryTopicOf Thermal_transmittance.