Water (Cp = 4180 J/kg K) enters the 2.5-cm internal-diameter tube of a double-pipe counter-flow heat exchanger at 17°C at a rate of 1.8 kg/s. Water is heated by steam condensing at 120°C (hfg = 2203 kJ/kg) in the shell. If the overall heat transfer coefficient of the heat exchanaer is 700 W/m2.K determine the

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Water (cp = 4180 J/kg-K) enters the 2.5-cm internal-diameter
%3D
tube of a double-pipe counter-flow heat exchanger at 17°C at a
rate of 1.8 kg/s. Water is heated by steam condensing at 120°C
(hfg
= 2203 kJ/kg) in the shell. If the overall heat transfer
coefficient of the heat exchanger is 700 W/m2.K, determine the
length of the tube required in order to heat the water to 80°c
using:
7.1) the LMTD method.
7.2) the ɛ-NTU method.
Transcribed Image Text:Water (cp = 4180 J/kg-K) enters the 2.5-cm internal-diameter %3D tube of a double-pipe counter-flow heat exchanger at 17°C at a rate of 1.8 kg/s. Water is heated by steam condensing at 120°C (hfg = 2203 kJ/kg) in the shell. If the overall heat transfer coefficient of the heat exchanger is 700 W/m2.K, determine the length of the tube required in order to heat the water to 80°c using: 7.1) the LMTD method. 7.2) the ɛ-NTU method.
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