The components of an electronic system dissipating 180 w are located in a 1-m-long horizontal duct whose
cross section is 16cm x 16 cm. the components in the duct are cooled by forced air, which enters at 27oc at a
rate of 0.65 m3/min. assuming 85 percent of the heat generated inside is transferred to air flowing through
the duct and the remaining 15 percent is lost through the outer surfaces of the duct, determine
(a) the exit temperature of air and
(b) the highest component surface temperature in the duct. (note: for the purpose of
determining the air properties, you can assume the mean bulk temperature of air is 35oc).