Engineering, 18.02.2020 23:56 eve2055
Hot liquid is flowing in a steel pipe with an inner diameter of D, = 22 mm and an outer diameter of D2 = 27 mm. The inner surface of the pipe is coated with a thin fluorinated ethylene propylene (FEP) lining. The thermal conductivity of the pipe wall is 15 W/m. K. The pipe outer surface is subjected to a uniform flux of 1200 W/m2 for a length of 1 m. The hot liquid flowing inside the pipe has a mean temperature of 180°C and a convection heat transfer coefficient of 50 W/m².K. The interface between the FEP lining and the steel surface has a thermal contact conductance of 1500 W/m2.K. a) Determine the temperatures at the lining and at the pipe outer surface for the pipe length subjected to the uniform heat flux. b) What is the total thermal resistance between the two temperatures? c) The ASME Code for Process Piping (ASME B31.3-2014, A323) recommends a maximum temperature for FEP lining to be 204°C. d) Does the FEP lining comply with the recommendation of the code?
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