Consider the flow of saturated steam at 270.1 kPa that flows through the shell side of a shell-and-tube heat exchanger while the water flows through 4 tubes of diameter 1.25 cm at a rate of 0.25 kg/s through each tube. The water enters the tubes of heat exchanger at 20°C and exits at 60°C. Due to the heat exchange with the cold fluid, steam is condensed on the tubes external surface. The convection heat transfer coefficient on the steam side is 1500 W/m2·K, while the fouling resistance for the steam and water may be taken as 0.00015 and 0.0001 m2·K/W, respectively. Using the NTU method, determine (a) effectiveness of the heat exchanger, (b) length of the tube, and (c) rate of steam condensation.
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.
Consider the flow of saturated steam at 270.1 kPa that
flows through the shell side of a shell-and-tube heat exchanger
while the water flows through 4 tubes of diameter 1.25 cm at a
rate of 0.25 kg/s through each tube. The water enters the tubes
of heat exchanger at 20°C and exits at 60°C. Due to the heat
exchange with the cold fluid, steam is condensed on the tubes
external surface. The convection heat transfer coefficient
on the steam side is 1500 W/m2·K, while the fouling resistance
for the steam and water may be taken as 0.00015 and
0.0001 m2·K/W, respectively. Using the NTU method, determine
(a) effectiveness of the heat exchanger, (b) length of the
tube, and (c) rate of steam condensation.
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