A hot plate 1.2 m wide, 0.35 m high and at 115 0C is exposed to the ambient still air at 25 0C. Calculate the following: (i). Average heat transfer coefficient over the surface of the plate; (ii) Heat loss from the plate; (iii) Rise in temperature of the air passing through the boundary. Properties of air at 70 C temperature are: r = 1.029 Kg/m3; Cp = 1005 J/Kg K; K = 0.0267 W/m K; m = 1.866 * 10'5 N- S/mz;
A hot plate 1.2 m wide, 0.35 m high and at 115 0C is exposed to the ambient still air at 25 0C. Calculate the following: (i). Average heat transfer coefficient over the surface of the plate; (ii) Heat loss from the plate; (iii) Rise in temperature of the air passing through the boundary. Properties of air at 70 C temperature are: r = 1.029 Kg/m3; Cp = 1005 J/Kg K; K = 0.0267 W/m K; m = 1.866 * 10'5 N- S/mz;
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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A hot plate 1.2 m wide, 0.35 m high and at 115 0C is exposed to the ambient still air at
25 0C. Calculate the following: (i). Average heat transfer coefficient over the surface of
the plate; (ii) Heat loss from the plate; (iii) Rise in temperature of the air passing through
the boundary. Properties of air at 70 C temperature are: r = 1.029 Kg/m3; Cp = 1005 J/Kg
K; K = 0.0267 W/m K; m = 1.866 * 10'5 N- S/mz;
Ans: Gr = 27.532*107 (i) h = 5.43 W/m2
C; (ii) Q = 410.5W (iii) At = 85.45 C
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