A rod CD of thermal resistance 5.0 K/W is joined at the middle of an identical rod AB as shown in figure. The ends A, B and D are maintained at 100ºC, 0ºC and 25ºC respectively. Find the heat current in CD.
Text Solution
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CHECK THE SOLUTION.
(4.0 W)
(Thermal resistance Å R = 
= 5.0 K/W
⇒ 
+ 
+ 
= 0
2T A – 2T C + T D – T C + 2T B – 2T C = 0
200 + 25 + 0 = 5T C
T C = 
= 45
i CD = 
= 
= 4 W
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