The tip of a soldering iron consists of a 0.6-cm-OD copper rod, 7.6 cm long. If the tip must be 204?C, what is the required minimum temperature of the base and the heat flow, in Btu??s per hour and in watts, into the base? Assume that h = 22.7 W/(m2 K) and Tair = 21?C.GIVENTip of soldering iron consists of copper rodOutside diameter (D) = 0.6 cm = 0.006 mLength (L) = 7.6 cm = 0.076 mTemperature of the tip (TL) = 204?CHeat transfer coefficient ( h ) = 22.7 W/(m2 K)Ambient temperature (T??) = 21?CASSUMPTIONSThe tip is in steady stateThe thermal conductivity of copper is uniform and constant, i.e., not a function of temperatureThe copper tip can be treated as afin

Transcribed Image Text:

T-204°C D-0.6 cm L=7.6 cm T-=21°C T.