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Question: 1. Air is flowing steadily through a duct whose inner walls are at 800°F. A thermocouple housed in a 1-in. OD steel well with rusty exterior indicates a temperature of 4500F. The air mass velocity is 3600 lbmassh ft2. Estimate the true temperature of the air.

2.Calculate the heat loss per foot from a 3-in. Schedule 40 pipe [D = 3.07 in, OD = 3.50 in.; k = 25 Btu/(h ft °F)] covered with a 1 1/4 in. thickness of insulation F = 0.1 Btu/(h ft OF)

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