a duct is being designed to transport waste gas from a processing unit to a pollution control device. the duct will be 5 ft high 6 ft wide and 100 ft long. in order to determine whether the duct will need to be insulated, the rate of heat loss to the environment must be estimated. based on the following design conditions, compute the rate of heart loss from the duct. average duct surface temperature=250F ambient air temperature=10F wind speed=20 miles/h
a duct is being designed to transport waste gas from a processing unit to a pollution control device. the duct will be 5 ft high 6 ft wide and 100 ft long. in order to determine whether the duct will need to be insulated, the rate of heat loss to the environment must be estimated. based on the following design conditions, compute the rate of heart loss from the duct.
average duct surface temperature=250F
ambient air temperature=10F
wind speed=20 miles/h
Average fluid temperature is determined. The hydraulic duct diameter for the rectangular duct is obtained from the area and wetted parameters. Reynolds number is estimated. The empirical formula is used to obtain the Nusselt number from the Reynolds number. The heat transfer coefficient is obtained from the Nusselt number.
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