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unit

Heat transfer coefficient

Definition

The heat transfer coefficient is the physical measure, which defines the transfer of heat flow through the contact borders of two media with different temperatures.

1 watt per square metre kelvin is the heat transfer coefficient, which corresponds to a density of heat flow of 1 watt per square metre for the difference of 1 kelvin.

 

system of units:   SI;
statute:   derived unit;
name the value:   κ;
unit name:   watt per square metre kelvin;
symbol unit:   W/(m²·K);
relationship of definition:   κ = q/τ;
dimension:   M T-3 Θ;
expression in other units:   in, yd, mi, ft;

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Units of measurement

namesymbol value in SI unit:
W/(m²·K)
note
1 Btuth per hour square foot degree Fahrenheit Btuth/(h·ft²·0F)≈ 5.674 466(1), (2)
1 BtuIT per hour square foot degree Fahrenheit BtuIT/(h·ft²·0F)≈ 5.678 263(1), (3)
1 Btuth per second square foot degree Fahrenheit Btuth/s·ft²·0F≈ 20 428.08(1), (2)
1 BtuIT per second square foot degree Fahrenheit BtuIT/s·ft²·0F≈ 20 441.75(1), (3)

Note:

(1) - Btu - British thermal unit;

(2) - th - thermochemical unit.

(3) - IT - common unit, international;