The roof of a refrigerated truck compartment is of composite construction, consisting of a layer of foamed urethane insulation (t2 = 50 mm, ki= 0.026 W/m-k) sandwiched between aluminum alloy panels (t1=5mm and Kp=180 W/m · K). The length and width of the roof are L = 10m and W = 3.5 m , respectively, and the temperature of the inner Ts, i = -100 C Consider conditions for which the truck is moving at a speed of V = 105 km/h, the air temperature is T? = 32°C, and the solar irradiation is Gs = 750 W/m2 • Turbulent flow be assumed over the entire length of the roof. (a) For equivalent values of the solar absorptivity and the emissivity of the outer surface (?s = ? = 0.5), estimate the average temperature Ts. o of the outer surface. What is the corresponding heat load imposed on the refrigeration system?(b) A special finish (?s = 0.15, ?= 0.8) may be applied to the outer surface. What effect would such an application have on the surface temperature and the heat load?(c) If, with ?s = ? = 0.5, the roof is not insulated (t2 = 0), what are the corresponding values of the surface temperature and the heat load?Thermal Paint