A counter-flow heat exchanger is stated to have an overall heat transfer coefficient of 284 W/m2·K when operating at design and clean conditions. Hot fluid enters the tube side at 93°C and exits at 71°C, while cold fluid enters the shell side at 27°C and exits at 38°C. After a period of use, built-up scale in the heat exchanger gives a fouling factor of 0.0004 m2·K/W. If the surface area is 93 m2, determine (a) the rate of heat transfer in the heat exchanger and (b) the mass flow rates of both hot and cold fluids. Assume both hot and cold fluids have a specific heat of 4.2 kJ/kg·K.
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.
A counter-flow heat exchanger is stated to have
an overall heat transfer coefficient of 284 W/m2·K when
operating at design and clean conditions. Hot fluid enters
the tube side at 93°C and exits at 71°C, while cold fluid
enters the shell side at 27°C and exits at 38°C. After a
period of use, built-up scale in the heat exchanger gives
a fouling factor of 0.0004 m2·K/W. If the surface area is
93 m2, determine (a) the rate of heat transfer in the heat
exchanger and (b) the mass flow rates of both hot and cold
fluids. Assume both hot and cold fluids have a specific heat
of 4.2 kJ/kg·K.
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