Heat Transfer Coefficient is used in measuring the transition of thermal energy from a hotter object to a cooler object (heat transfer). It is a ratio of the heat transfer rate or heat flux and the temperature difference which act as a driving force for the heat to transfer in such a way that the both the object and its surroundings reach to an equilibrium condition. Heat transfer between object in proximity with a temperature difference can never be stopped; it can only be slowed. Heat transfer coefficient is the inverse of thermal insulance.

## Units and Measures

Heat transfer coefficient is the quantity of heat that passes in unit time through unit area of a plate of particular thickness when it’s opposite faces differ in temperature.

Following are the units of heat transfer coefficient:

- SI Units: watt per square-meter kelvin (W /m²•K)
- Imperial Units: British thermal unit per hour Square feet degree Fahrenheit (Btu /ft²•°F•h)

## Useful References

- http://en.wikipedia.org/wiki/Heat_transfer
- http://en.wikipedia.org/wiki/Heat_transfer_coefficient
- http://en.wikipedia.org/wiki/Thermal_conductivity

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