35 pts 2 A steam header carrying highpressure steam is made

35 pts, 2) A steam header carrying high-pressure steam is made of 3-inch schedule 80 steel pipe (k 26 BTU/hr ft oF. It is insulated with 1.25 inches of a molded high temperature magnesia insulation (k 0,059 BTU/hr ft oF) which in turn is covered with an additional layer of 2.5 inches of a laminated felt (kfel 0.042 BTU/hr ft °F. In a test, the temperature of the surroundings (the ambient) was 75 F, the average temperature of the steam-side surface of the pipe was 950°F, and the temperature of the outer surface of the felt was measured to be 122°F a) Calculate the heat loss from the insulated pipe expressed as BTU/Chr) (ft of pipe) b) Calculate the temperature at the interface between the two layers of insulation. c) Calculate the heat transfer coefficient between the outer surface of the felt and the surroundings expressed as BTU/Chr) (ft of outside surface area (OF)

Solution

Please go through following links:

1   https://www.dropbox.com/s/zoonbobfepr4j48/IMG_20160920_130817.jpg?dl=0

2   https://www.dropbox.com/s/doqaepn05whhs3p/IMG_20160920_132121.jpg?dl=0

3   https://www.dropbox.com/s/wefrnur9a14bqcg/IMG_20160920_132758.jpg?dl=0