Calculate the heat flux (Heat transfer)

[Czarinah]

The convection heat transfer coefficient between a surface at 40°C and ambient air at 20°C is 20 W/m2oK. How do we calculate the heat flux leaving the surface by convection?

 

[IRstuff]

That equation should be in your textbook, or you can look in Wikipedia.

Your unit for temperature is incorrect, by the way. the unit is kelvin, not degree-kelvin, if that was your intent.

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