Chemical Engineering - Heat Transfer - Discussion
Discussion Forum : Heat Transfer - Section 6 (Q.No. 15)
15.
Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer co-efficient is 3k/l. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade ?
Discussion:
2 comments Page 1 of 1.
A.Ali said:
10 years ago
A) Convective heat transfer:
Q/A = h(100-Ts) ----- (1).
B) Conductive heat transfer:
Q/A = k (Ts-25) /L----- (2).
Comparing equation 1 & 2.
h(100-Ts) = k(Ts-25)/L.
Since h = 3k/L.
Therefore 3k(100-Ts)/L = k(Ts-25)/L.
Solving we get.
Ts = 81.25 C.
Q/A = h(100-Ts) ----- (1).
B) Conductive heat transfer:
Q/A = k (Ts-25) /L----- (2).
Comparing equation 1 & 2.
h(100-Ts) = k(Ts-25)/L.
Since h = 3k/L.
Therefore 3k(100-Ts)/L = k(Ts-25)/L.
Solving we get.
Ts = 81.25 C.
(5)
RAJIV KUMAR said:
6 years ago
Thanks @Ali.
(1)
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers