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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

ko
열 전달 계수
열 전달율

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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