A double tube heat exchanger operating in parallel is used to heat water compressed in the liquid phase from 20°C to 80°C through the use of a fluid initially at 160°C which, upon flowing through the heat exchanger, has its temperature reduced to 120°C. Consider that the inner tube is metallic, with a roughness height equal to 0.05 mm, with internal and external diameters equal, respectively to 27.9 mm and 33.4 mm, and whose resistance to conduction heat transfer can be disregarded. Knowing that the water flows into the inner tube with a mass flow of 1.0 kg/s and that the convective coefficient observed between the hot fluid and the outer surface of the inner tube is equal to 3000 W/(m2 .K). Determine: The exchange area and the corresponding length of the tube using the logarithmic mean temperature difference method - MLDT
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 double tube heat exchanger operating in parallel is used to heat water compressed in the liquid phase from 20°C to 80°C through the use of a fluid initially at 160°C which, upon flowing through the heat exchanger, has its temperature reduced to 120°C. Consider that the inner tube is metallic, with a roughness height equal to 0.05 mm, with internal and external diameters equal, respectively to 27.9 mm and 33.4 mm, and whose resistance to conduction heat transfer can be disregarded. Knowing that the water flows into the inner tube with a mass flow of 1.0 kg/s and that the convective coefficient observed between the hot fluid and the outer surface of the inner tube is equal to 3000 W/(m2 .K).
Determine: The exchange area and the corresponding length of the tube using the logarithmic mean temperature difference method - MLDT
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