Metal plates of size 60 cm × 50 cm, and thickness 1 cm are initially at 100◦C. They are to be cooled by blowing chilled air at 2 m/sec over both surfaces, the flow being directed along the side whose length is 60 cm. Incoming air temperature is 10◦C. Data for the metal: ρ = 7854 kg/m3, cp = 434 J/kg/K, k = 60.5 W/m/K Data for air: Use values at 50◦C. (a Determine the convective heat transfer coefficient at the surfaces of the plates. (b Determine whether lumped system analysis is applicable (c Assume the convection coefficient is constant, determine how much time is necessary for the temperature of the plates to drop to 25◦C. (d Estimate the total heat lost by a plate when it has reached 25◦C
Metal plates of size 60 cm × 50 cm, and thickness 1 cm are initially at 100◦C. They are to be cooled by blowing chilled air at 2 m/sec over both surfaces, the flow being directed along the side whose length is 60 cm. Incoming air temperature is 10◦C. Data for the metal: ρ = 7854 kg/m3, cp = 434 J/kg/K, k = 60.5 W/m/K Data for air: Use values at 50◦C. (a Determine the convective heat transfer coefficient at the surfaces of the plates. (b Determine whether lumped system analysis is applicable (c Assume the convection coefficient is constant, determine how much time is necessary for the temperature of the plates to drop to 25◦C. (d Estimate the total heat lost by a plate when it has reached 25◦C
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Metal plates of size 60 cm × 50 cm, and thickness 1 cm are initially at 100◦C. They are to be cooled by blowing chilled air at 2 m/sec over both surfaces, the flow being directed along the side whose length is 60 cm. Incoming air temperature is 10◦C.
Data for the metal: ρ = 7854 kg/m3, cp = 434 J/kg/K, k = 60.5 W/m/K Data for air: Use values at 50◦C.
(a Determine the convective heat transfer coefficient at the surfaces of the plates.
(b Determine whether lumped system analysis is applicable
(c Assume the convection coefficient is constant, determine how much time is necessary for the temperature of the plates to drop to 25◦C.
(d Estimate the total heat lost by a plate when it has reached 25◦C.
Transcribed Image Text:V=2 m/s
at 10 °C
1 cm
60 cm
0cm
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