Water at 22oC is heated by solar-heated air in a counter-flow concentric tube heat exchanger. Air enters through the outer annulus at 90oC at a rate of 0.3 kg/s, while water enters through the inner tube at a rate of 0.1 kg/s. The inner and outer diameters of the inner tube are Di=12 mm, Do=14 mm respectively and the length of the heat exchanger is L=12 m. The overall heat transfer coefficient based on the water-side surface area is Uc=800 W/m2K. The amount of heat gained by the water is? Take for liquid water: cp,c=4178 J/kgK and for air: cp,h=1009 J/kgK. Select one: a. 16.6 kW b. 12.06 kW c. 28.4 kW d. 20.6 kW
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 at 22oC is heated by solar-heated air in a counter-flow concentric tube heat exchanger. Air enters through the outer annulus at 90oC at a rate of 0.3 kg/s, while water enters through the inner tube at a rate of 0.1 kg/s. The inner and outer diameters of the inner tube are Di=12 mm, Do=14 mm respectively and the length of the heat exchanger is L=12 m. The overall heat transfer coefficient based on the water-side surface area is Uc=800 W/m2K. The amount of heat gained by the water is? Take for liquid water: cp,c=4178 J/kgK and for air: cp,h=1009 J/kgK.
Select one:
a. 16.6 kW
b. 12.06 kW
c. 28.4 kW
d. 20.6 kW
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