A counterflow concentric tube heat exchanger is used to cool the lubricating oil from a large gas turbine engine. The flow rate of cooling water through the inner tube (Di = 25 mm) is 0.2 kg/s, while the flow of oil through the outer annulus (Do = 45 mm) is 0.1 kg/s. The oil and water enter at temperatures of 100°C and 30°C respectively. What is the heat transfer rate, and the overall convective heat transfer coefficient between fluids? Assuming negligible heat loss in the surrounding and negligible tube wall resistance and how long must the tube be made if the required outlet temperature of the oil is 60°C? (Cp oil = 2131 J/kg K, Cp water = 4187 J/kg K, hi = 2250W/m2K, ho = 38.8 W/m2K)
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 counterflow concentric tube heat exchanger is used to cool the lubricating oil from a large gas turbine engine. The flow rate of cooling water through the inner tube (Di = 25 mm) is 0.2 kg/s, while the flow of oil through the outer annulus (Do = 45 mm) is 0.1 kg/s. The oil and water enter at temperatures of 100°C and 30°C respectively. What is the heat transfer rate, and the overall convective heat transfer coefficient between fluids? Assuming negligible heat loss in the surrounding and negligible tube wall resistance and how long must the tube be made if the required outlet temperature of the oil is 60°C? (Cp oil = 2131 J/kg K, Cp water = 4187 J/kg K, hi = 2250W/m2K, ho = 38.8 W/m2K)
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