Water (cp = 4180 J/kg·K) enters the 2.5-cminternal- 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 exchanger is 700 W/m2·K, determine the length of the tube required in order to heat the water to 80°C using (a) the LMTD method and (b) the «-NTU method.
Heat Exchangers
Heat exchangers are the types of equipment that are primarily employed to transfer the thermal energy from one fluid to another, provided that one of the fluids should be at a higher thermal energy content than the other fluid.
Heat Exchanger
The heat exchanger is a combination of two words ''Heat'' and ''Exchanger''. It is a mechanical device that is used to exchange heat energy between two fluids.
Water (cp = 4180 J/kg·K) enters the 2.5-cminternal-
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 exchanger
is 700 W/m2·K, determine the length of the tube required in
order to heat the water to 80°C using (a) the LMTD method
and (b) the «-NTU method.
Step by step
Solved in 3 steps with 9 images
