Steam at 200°C flows in acast iron pipe (k = 80 W/m·K) 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·K). The heat transfer coefficient at the inner surface is 75 W/m·K. If the temperature at the interface of the iron pipe and the insulation is 194°C, the temperature at the outer surface of the insulation is
(a) 32 °C
(b) 45 °C
(c) 51°C
(d) 75 °C
(e) 100 °C
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