Consider a refrigeration truck traveling at 55mph at a location where the air temperature is 80F°. The refrigerated compartment of the truck can be considered to be a 9ft-wide, 8ft-high, and 20ft-long...

Extracted text: Consider a refrigeration truck traveling at 55mph at a location where the air temperature is 80F°. The refrigerated compartment of the truck can be considered to be a 9ft-wide, 8ft-high, and 20ft-long rectangular box. The refrigeration system of the truck can provide 3tons of refrigeration (i.e., it can remove heat at a rate of 600Btu/min). The outer surface of the truck is coated with a low-emissivity material, and thus radiation heat transfer is very small. Determine the average temperature of the outer surface of the refrigeration compartment of the truck if the refrigeration system is observed to be operating at half the capacity. Assume the air flow over the entire outer surface to be turbulent and the heat transfer coefficient at the front and rear surfaces to be equal to that on side surfaces. Taking the following properties for the air (k=0.01481 Btu/h ft -F°, v= 0.1697×10° ft/s, and Pr =0.729).