Problem

A 25-cm-long, 0.4-cm-diameter electric resistance wire is used to determine the convection...

A 25-cm-long, 0.4-cm-diameter electric resistance wire is used to determine the convection heat transfer coefficient in air at 25°C experimentally. The surface temperature of the wire is measured to be 230°C when the electric power consumption is 180 W. If the radiation heat loss from the wire is calculated to be 60 W, the convection heat transfer coefficient is

(a) 186 W/m2•°C

(b) 280 W/m2•°C

(c) 373 W/m2•°C

(d) 585 W/m2•°C 

(e) 620 W/m2•°C

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