A 15-ft long strip of sheet metal is being transported on a conveyor at a velocity of 16 f...

A 15-ft long strip of sheet metal is being transported on a conveyor at a velocity of 16 ft/s. To cure the coating on the upper surface of the sheet metal, infrared lamps providing a constant radiant flux of 1500 Btu/h·ft² are used. The coating on the upper surface of the metal strip has an absorptivity of 0.6 and an emissivity of 0.7, while the surrounding ambient air temperature is 77°F. Radiation heat transfer occurs only on the upper surface, while convection heat transfer occurs on both upper and lower surfaces of the sheet metal. Determine the surface temperature of the sheet metal. Evaluate the properties of air at 180°F.