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Area Physics for electrotechnology / Thermodynamics

IEV ref113-04-39

Symbol
K
U

en
coefficient of heat transfer
thermal transmittance
at a point on the surface separating two media with different thermodynamic temperatures, magnitude of the density of heat flow rate φ divided by the absolute value of temperature difference ΔT, thus K= |φ| | ΔT| MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGe aGqk0di9Wr=fpeei0di9v8qiW7rqqrVepeea0xe9LqFf0xc9q8qqaq Fn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpe WZqaaeaaciWacmGadaGadeaabaGaaqaaaOqaaiaadUeacqGH9aqpda WcaaqaamaaemaabaacdmGae8x1dygacaGLhWUaayjcSdaabaWaaqWa aeaaimaacqGFuoarcaaMc8UaamivaaGaay5bSlaawIa7aaaaaaa@4696@

NOTE 1 The coefficient of heat transfer is zero for an adiabatic boundary and infinity for a diathermic boundary.

NOTE 2 The name “thermal transmittance” and the symbol U are mainly used in building technology.

NOTE 3 The coherent SI unit of coefficient of heat transfer is watt per square metre kelvin, W/(m2·K).


fr
coefficient de transmission thermique, m
transmittance thermique, f
en un point d'une surface séparant deux milieux de températures thermodynamiques différentes, quotient de la norme du flux thermique surfacique φ par la valeur absolue de la différence de température ΔT, soit K= |φ| | ΔT| MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGe aGqk0di9Wr=fpeei0di9v8qiW7rqqrVepeea0xe9LqFf0xc9q8qqaq Fn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpe WZqaaeaaciWacmGadaGadeaabaGaaqaaaOqaaiaadUeacqGH9aqpda WcaaqaamaaemaabaacdmGae8x1dygacaGLhWUaayjcSdaabaWaaqWa aeaaimaacqGFuoarcaaMc8UaamivaaGaay5bSlaawIa7aaaaaaa@4696@

NOTE 1 Le coefficient de transmission thermique est nul pour une limite adiabatique et infini pour une limite diathermique.

NOTE 2 Le nom «transmittance thermique» et le symbole U sont surtout utilisés en technologie des bâtiments.

NOTE 3 L'unité SI cohérente de coefficient de transmission thermique est le watt par mètre carré kelvin, W/(m2·K).


ar
معامل الانتقال الحرارى

de
Wärmedurchgangskoeffizient, m
Wärmedämmwert (im Bauwesen), m
Wärmedurchgangszahl, f, (abgelehnt)

es
coeficiente de transmisión de calor
transmitancia térmica

fi
lämmönsiirtymiskerroin

it
coefficiente di trasmissione termica

ja
熱伝達係数
熱伝達

pl
współczynnik przewodnictwa cieplnego

pt
coeficiente de transmissão térmica
transmitância térmica

sv
värmeöverföringskoefficient

zh
传热系数
热传递系数

Publication date: 2011-04
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