Problem 1.3 - Modes of Heat Transfe Using heat transfer relations, a) For the steel beam in Figure 1a, determine the rate of conduction heat transfer, in 45 [.A= 0.125 [m²], L = 0.127 [m], T₁ = 298 [K], T₂ = 273 [K]. b) For the transistor in Figure 1b, determine the rate of convection heat transfer from to the air, in [W], for h= 10 [.A= 0.125 [m²], Tb = 305[K], T, = 298 [K]. ARE A Cooling air flow T

Elements Of Electromagnetics
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Problem 1.3 Modes of Heat Transfer
Using heat transfer relations,
a) For the steel beam in Figure 1a, determine the rate of conduction heat transfer, in [W], for k=
45 [.A= 0.125 [m²], L = 0.127 [m], T₁ = 298 [K], T₂ 273 [K].
H
-
mk.
b) For the transistor in Figure 1b, determine the rate of convection heat transfer from the surface
to the air, in [W], for h = 10 [2].A = 0.125 [m²], Tb = 305 [K], T = 298 [K].
W
,A
Cooling air flow
T<T,
I
ANA
Figure 1a
Transistor
Figure 1b
Wire leads
Circuit board
Transcribed Image Text:Problem 1.3 Modes of Heat Transfer Using heat transfer relations, a) For the steel beam in Figure 1a, determine the rate of conduction heat transfer, in [W], for k= 45 [.A= 0.125 [m²], L = 0.127 [m], T₁ = 298 [K], T₂ 273 [K]. H - mk. b) For the transistor in Figure 1b, determine the rate of convection heat transfer from the surface to the air, in [W], for h = 10 [2].A = 0.125 [m²], Tb = 305 [K], T = 298 [K]. W ,A Cooling air flow T<T, I ANA Figure 1a Transistor Figure 1b Wire leads Circuit board
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