Consider a refrigeration truck traveling at 55 mph at a location where the air temperature is 80°F. The refrigerated compartment of the truck can be considered to be a 9-ft-wide, 8-ft-high, and 20-ft-long rectangular box. The refrigeration system of the truck can provide 3 tons of refrigeration (i.e., it can remove heat at a rate of 600 Btu/ min). The outer surface of the truck is coated with a lowemissivity 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. For air properties evaluations assume a film temperature of 80°F. Is this a good assumption?
Consider a refrigeration truck traveling at 55 mph
at a location where the air temperature is 80°F. The refrigerated
compartment of the truck can be considered to be
a 9-ft-wide, 8-ft-high, and 20-ft-long rectangular box. The
refrigeration system of the truck can provide 3 tons of
refrigeration (i.e., it can remove heat at a rate of 600 Btu/
min). The outer surface of the truck is coated with a lowemissivity
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.
For air properties evaluations assume a film temperature of
80°F. Is this a good assumption?
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