# Heat Transfer in an Aluminum Block

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What is the change in temperature of aluminum block that has continuous air flow directed over it? Assume block temperature to be constant throughout. Airstream is directed over part for 1 minute; assume airstream to be 25% efficient. Show all calculations.

Weight of block = 15 kg

Initial temp. of block = 95Â°C

Specific heat of Aluminum = .897 kJ/kgC

Temp of airflow = 40Â°C

Air flowrate = 50 m^3/Min

Density of air @ 40Â°C = 1.127 kg/m^3

Specific Heat air @ 40Â°C = 1.005 kJ/kgK

Note: I keep coming up with an answer of only 57 seconds. That seems to low. I have attached an excel spread sheet that I was using to solve my problem.

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#### Solution Summary

The solution discusses heat transfer in an aluminum block.

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