Question 5.7 In a parallel flow heat exchanger, hot fluid enters the heat exchanger at a temperature of 150°C and a mass flow rate of 3 kg/s. The cooling medium enters the heat exchanger at a temperature of 30°C with a mass flow rate of 0.5 kg/s and Examiner's Signature Moderator's Signature Page leaves at a temperature of 70°C. The specific heat capacities of the hot and cold fluids are 1150 J/kg-K and 4180 J/kg K, respectively. The convection heat transfer coefficient on the inner and outer side of the tube is 300 W /m2.K and 800 W /m2.K, respectively. For a fouling factor of 0.0003 m2.K/W on the tube side and 0.0001 m2.K/W on the shell side, determine the overall heat transfer coefficient, the exit temperature of the hot fluid as well as the surface area of the heat exchanger.

Question
Question 5.7
In a parallel flow heat exchanger, hot fluid enters the heat exchanger at a
temperature of 150°C and a mass flow rate of 3 kg/s. The cooling medium enters the
heat exchanger at a temperature of 30°C with a mass flow rate of 0.5 kg/s and
Examiner's Signature
Moderator's Signature
Page
leaves at a temperature of 70°C. The specific heat capacities of the hot and cold
fluids are 1150 J/kg-K and 4180 J/kg K, respectively. The convection heat transfer
coefficient on the inner and outer side of the tube is 300 W /m2.K and 800 W /m2.K,
respectively. For a fouling factor of 0.0003 m2.K/W on the tube side and 0.0001
m2.K/W on the shell side, determine the overall heat transfer coefficient, the exit
temperature of the hot fluid as well as the surface area of the heat exchanger.
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Transcribed Image Text

Question 5.7 In a parallel flow heat exchanger, hot fluid enters the heat exchanger at a temperature of 150°C and a mass flow rate of 3 kg/s. The cooling medium enters the heat exchanger at a temperature of 30°C with a mass flow rate of 0.5 kg/s and Examiner's Signature Moderator's Signature Page leaves at a temperature of 70°C. The specific heat capacities of the hot and cold fluids are 1150 J/kg-K and 4180 J/kg K, respectively. The convection heat transfer coefficient on the inner and outer side of the tube is 300 W /m2.K and 800 W /m2.K, respectively. For a fouling factor of 0.0003 m2.K/W on the tube side and 0.0001 m2.K/W on the shell side, determine the overall heat transfer coefficient, the exit temperature of the hot fluid as well as the surface area of the heat exchanger.

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