A refrigerated truck carrying the food stuff is speeding on a highway at 95 km/h in a desert area, where the ambient air temperature is 50°C. The body of the truck may be considered as a rectangular...

A refrigerated truck carrying the food stuff is speeding on a highway at 95 km/h in a desert area, where the ambient air temperature is 50°C. The body of the truck may be considered as a rectangular box, 10 m long, 4 m wide and 3 m high. Consider the boundary layer on four walls to be turbulent and the heat is transferred from these four surfaces. If the wall surfaces of the truck are maintained at 10°C. Calculate the following :

 (a) Heat loss from the four vertical surfaces ;

(b) Power required to overcome the resistance acting on surfaces.