# HW1-solution - ME 426 Homework#1 1 Hot water flows through...

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Homework #1 1. Hot water flows through a circular tube where ID = 0.0550 m and OD = 0.0630 m. The thermal conductivity of the material is 50 W/m K. The tube surfaces have crust deposits such that fouling factors for inner and outer surfaces are i R = 0.000200 m 2 K/W and o R = 0.000300 m 2 K/W, respectively. The heat transfer coefficients in the inner and outer surfaces of the tube are 4620 W/ m 2 K and 1600 W/ m 2 K, respectively. Calculate the overall heat transfer coefficients based on the outer surface area. R 1 UA 1 U A 1 U A = 1 h A ln r r 2 kL R A R A 1 A h t i i o o i i o i fi i fo o o o .K W/m 0.001487 0.000625 000300 . 0 0.000229 0.000085 0.000248 = 1600 1 000300 . 0 0.0550 0.0630 0.000200 50 2 0550 . 0 0630 . 0 ln 0.063 0.0550 4620 0.0630 = h 1 R d R d 2k r r ln d d h d = h 1 R A R A kL 2 r r ln A A h A = U 1 2 o fo i fi o i o o i i o o fo i fi o i o o i i o o .K

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HW1-solution - ME 426 Homework#1 1 Hot water flows through...

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