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6-37 a 1.4 m long, 0.2 cm diameter electrical wire extends across a room that is maintained at 20 c. heat is generated in the wire as a result of resistance heating and the surface temperature of the wire is measured to be 240 c in steady operation. also, the voltage drop and electric current through the wire are measured to be 110 v and 3 a, respectively. disregarding any heat transfer by radiation, determine the convection heat transfer coefficient for heat transfer between the outer surface of the wire and the air in the room. answer: 170.5 w/m2k. add: the room ceiling fan is turned on and draws 5 a. what is the heat transfer coefficient now?
Sagot :
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