See the attached file.
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 = 95°C
Specific heat of Aluminum = .897 kJ/kgC
Temp of airflow = 40°C
Air flowrate = 50 m^3/Min
Density of air @ 40°C = 1.127 kg/m^3
Specific Heat air @ 40°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.© BrainMass Inc. brainmass.com October 9, 2019, 11:24 pm ad1c9bdddf
The solution discusses heat transfer in an aluminum block.