Proportionality constant $\begin{array}{l}U\end{array}$ between the heat flux $\begin{array}{l}j_H\end{array}$ and the temperature difference $\begin{array}{l}\Delta T\end{array}$ creating thermodynamic driving force for the heat flow:

(1)	$\begin{array}{l}\displaystyle j_H = U \cdot \Delta T\end{array}$

Symbol	Dimension	SI units	Oil metric units	Oil field units
$\begin{array}{l}U\end{array}$	M¹T⁻³Θ⁻¹	W/(m²⋅K)	W/(m²⋅K)	BTU/(hr⋅ft²⋅°F)

The examples of mathematical models of Heat Transfer Coefficient are summarized in Heat Transfer Coefficient @model.

Reference

https://www.engineeringtoolbox.com/conductive-heat-transfer-d_428.html

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Heat Transfer Coefficient = HTC (U)

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Reference