Cold water (cp = 4180 J/kg·K) enters the tubes of a heat exchanger with 2-shell passes and 20-tube passes at 20°C at a rate of 3 kg/s, while hot oil (cp = 2200 J/kg·K) enters the shell at 130°C at the same mass flow rate and leaves at 60°C. If the overall heat transfer coefficient based on the outer surface of the tube is 220 W/m2·K, determine (a) the rate of heat transfer and (b) the heat transfer surface area on the outer side of the tube.

Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Katz, Debora M.
Chapter21: Heat And The First Law Of Thermodynamics
Section: Chapter Questions
Problem 68PQ
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Cold water (cp = 4180 J/kg·K) enters the tubes of
a heat exchanger with 2-shell passes and 20-tube passes at
20°C at a rate of 3 kg/s, while hot oil (cp = 2200 J/kg·K)
enters the shell at 130°C at the same mass flow rate and
leaves at 60°C. If the overall heat transfer coefficient based
on the outer surface of the tube is 220 W/m2·K, determine
(a) the rate of heat transfer and (b) the heat transfer surface
area on the outer side of the tube.

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