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This is problem 6-12 from El-Wakil’s Powerplant Technology book -- a condensing only feedwater heater uses...

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Mechanical Engineering

This is problem 6-12 from El-Wakil’s Powerplant Technology book-- a condensing only feedwater heater uses 7/8-in-OD 90-10copper-nickel tubes. It receives 84,000 lbm/h of 95percent quality bled steam at 20 psia, and 160,000 lbm/hof drain from the next higher pressure heater at 240°F.3.9x106 lbm/h of feedwater goes through theheater at 7 ft/s, 2000 psia, and 195°F. The terminal temperaturedifference is 5°F. Determine the size, length, and number of tubesbased on a U-tube design. Take a maximum allowable stress in thetubes of 15,000 psi.

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4.1 Ratings (629 Votes)
Calculation of tubethicknessThe tube membrane stress is given byP tube inside pressure2000 psid internal diameterD2tt thicknessDOD78 in0875 inWe assume allowable stress is 15000 psiHencet0055 inWe select 16 BWG tubes with    See Answer
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