Hot water (cph = 4188 J/kg·K) with mass flow rate of 2.5 kg/s at 100°C enters a thin-walled concentric tube counter-flow heat exchanger with a surface area of 23 m2 and an overall heat transfer coefficient of 1000 W/m2·K. Cold water (cpc = 4178 J/kg·K) with mass flow rate of 5 kg/s enters the heat exchanger at 20°C, determine (a) the heat transfer rate for the heat exchanger and (b) the outlet temperatures of the cold and hot fluids. After a period of operation, the overall heat transfer coefficient is reduced to 500 W/m2·K, determine (c) the fouling factor that caused the reduction in the overall heat transfer coefficient.
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.
Hot water (cph = 4188 J/kg·K) with mass flow rate
of 2.5 kg/s at 100°C enters a thin-walled concentric tube
counter-flow heat exchanger with a surface area of 23 m2
and an overall heat transfer coefficient of 1000 W/m2·K.
Cold water (cpc = 4178 J/kg·K) with mass flow rate of 5 kg/s
enters the heat exchanger at 20°C, determine (a) the heat
transfer rate for the heat exchanger and (b) the outlet temperatures
of the cold and hot fluids. After a period of operation,
the overall heat transfer coefficient is reduced to 500 W/m2·K,
determine (c) the fouling factor that caused the reduction in
the overall heat transfer coefficient.
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