Question: An Oil ( C = 3 . 6 k J k g . C ) inter a heat exchanger ( one shell and two passes

An Oil (C=3.6kJkg.C) inter a heat exchanger (one shell and two passes) at a
Temperature 200C and leave the Heat exchanger at Temperature 40C the mass
flow rate is 18000kghr cooled by water inter the HE at Temperature. 10C and
mass flow rate 36000kghr the falling factor is 0.85 Calculate the number of
pipes
using NTU method, assuming U =500W/m^2.K
Assume D=0.05meters and L=3meters
An Oil ( C = 3 . 6 k J k g . C ) inter a heat

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