Consider a 4.5-m-long, 3.0-m-high, and 0.22-m-thick wall made of concrete (k = 1.1 W/m•ºC). The design temperatures of the indoor and outdoor air are 24ºC and 3ºC, respectively, and the heat transfer coefficients on the inner and outer surfaces are 10 and 20 W/m2•ºC. If a polyurethane foam insulation (k = 0.03 W/m•ºC) is to be placed on the inner surface of the wall to increase the inner surface temperature of the wall to 22ºC, the required thickness of the insulation is
(a) 3.3 cm
(b) 3.0 cm
(c) 2.7 cm
(d) 2.4 cm
(e) 2.1 cm
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