Solve the below problem:
Q: A refrigeration truck is traveling at 80 mph on a desert highway where the air temperature is 50°C. The body of the truck may be idealized as a rectangular box, 3 m wide, 2.1 m high, and 6 m long, at a surface temperature of 10°C. Assume that the heat transfer from the front and back of the truck may be neglected, that the stream does not separate from the surface, and that the boundary layer is turbulent over the whole surface. If, for every 3600 W of heat loss, one ton capacity of the refrigerating unit is necessary, calculate the required tonnage of the refrigeration unit.
GIVEN
A refrigeration truck traveling on a desert highway
Speed of truck (U∞) = 80 mph
Air temperature (T∞) = 50°C
Truck may be idealized as a box: 3 m wide, 2.1 m high, 6 m long
Truck surface temperature (Ts) = 10°C
One ton of refrigeration unit is needed for every 3600 W of heat loss
ASSUMPTIONS
The heat transfer from the front and back of the truck is negligible
Air stream does not separate from the surface
The boundary layer is turbulent over the whole surface
Moisture of the air is negligible
Radiative heat transfer isnegligible
