Water enters a crossflow exchanger (with both fluids unmixed) at 16◦C and flows at 7.5 kg/s. It is used to cool air flowing at ◦22 10 kg/s which enters at 120 C. The exchanger has an overall heat transfer coefficient of 225 W/m /K and a surface area of 225 m . Data: Specific heat of air = 1014 J/kg/K; Specific heat of water = 4182 J/kg/K. (a Calculate the effectiveness of the exchanger (b Determine the heat transfer rate in the exchanger (c Determine the exit temperature of air
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 enters a crossflow exchanger (with both fluids unmixed) at 16◦C and flows at 7.5 kg/s. It is used to cool air flowing at
◦22 10 kg/s which enters at 120 C. The exchanger has an overall heat transfer coefficient of 225 W/m /K and a surface area of 225 m .
Data: Specific heat of air = 1014 J/kg/K; Specific heat of water = 4182 J/kg/K.
(a Calculate the effectiveness of the exchanger
(b Determine the heat transfer rate in the exchanger
(c Determine the exit temperature of air
(d After prolonged use the exchanger is affected by fouling, with a fouling factor of 2 × 10−3 m2/W/K. Determine the heat transfer rate in the exchanger with fouling.
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