IEVref:113-04-39ID:
Language:enStatus: Standard
Term: coefficient of heat transfer
Synonym1: thermal transmittance
[Preferred]
Synonym2:
Synonym3:
Symbol: K
U
Definition: 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| | Δ T| 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).


Publication date:2011-04
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Internal notes:2017-06-02: Cleanup - Remove Attached Image 113-04-39en.gif
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