IEVref: 113-04-39 ID: Language: en Status: Standard Term: coefficient of heat transfer Synonym1: thermal transmittance [Preferred] Synonym2: Synonym3: Symbol: KU 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 $K=\frac{|\phi |}{|\Delta \text{\hspace{0.17em}}T|}$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 Source: Replaces: Internal notes: 2017-06-02: Cleanup - Remove Attached Image 113-04-39en.gif CO remarks: TC/SC remarks: VT remarks: Domain1: Domain2: Domain3: Domain4: Domain5: