Steam at 200ºC flows in a cast iron pipe (k = 80 W/m•ºC) whose inner and outer diameters are D1 = 0.20 m and D2 = 0.22 m, respectively. The pipe is covered with 2-cm-thick glass wool insulation (k = 0.05 W/m•ºC). The heat transfer coefficient at the inner surface is 75 W/m2•ºC. If the temperature at the interface of the iron pipe and the insulation is 194ºC, the temperature at the outer surface of the insulation is
(a) 32ºC
(b) 45ºC
(c) 51ºC
(d) 75ºC
(e) 100ºC
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