Estimate heat transfer coefficient

AI Thread Summary
The setup involves heating a nichrome wire with a 3-volt battery while measuring its power, temperature, and the surrounding air temperature. The formula ΔT=PRsurf is used to relate the temperature difference to thermal resistance, where P is calculated as the product of voltage and current. The thermal resistance is defined as Rsurf=1/hA, with A being the surface area of the nichrome wire and h being the heat transfer coefficient. The calculation of the heat transfer coefficient is the main focus, and the user seeks validation of their method and formula. Overall, the analysis appears to be sound for determining the heat transfer coefficient.
totoykabute
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i prepared a setup wherein i heat a nichrome wire with 3 volts battery, measure its power, the temperature of the nichrome and the temperature of air.. by using the formula

ΔT=PRsurf

where

ΔT=Tnichrome - Tair

P=VI

Rsurf=1/hA,

R is, basically, the thermal resistance to heat from the copper surface to the surrounding air

A is the area of nichrome wire...pi x D x length

h is the heat transfer coefficient you are looking for and the only unknown...

i calculated the heat transfer coefficient..

.. i got that formula from a post somewhere here in PF..

now tell me.. is my setup right to calculate the h.. or is something wrong with the formula?
 
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Your analysis seems sound.
 

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