To reduce heat losses, a horizontal rectangular duct

Chapter 9, Problem 9.88

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To reduce heat losses, a horizontal rectangular duct thatis W?0.80 m wide and H?0.3 m high is encased in ametal radiation shield. The duct wall and shield are sep-arated by an air gap of thickness t?0.06 m. For a ductwall temperature of Td?40?C and a shield temperatureof Tsh?20?C, determine the convection heat loss perunit length from the duct

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