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Question: An industrial gas turbine plants employs a counterflow concentric tube

24 Aug 2024,11:20 PM

 

An industrial gas turbine plants employs a counterflow concentric tube heat exchanger which cools the lubricating oil coming out from its bearings. The oil mass flow rate is 0.2 kg/s and its specific heat is 2.2 kJ/kg.K. The mass flow rate of the coolant (water) which flows in the opposite direction is 0.16 kg/s and its specific heat is 4.18 kJ/kg.K. The lubricating oil enters the cooler at 110°C and leaves at 40°C. The cooling water enters the cooler at 20°C. The heat transfer coefficient from the oil to the tube surface is 2300 W/ m2.K and from tube surfaces to water is 5700 W/ m2.K. The resistance of the tube wall may be neglected. If the mean diameter of the tube is 15 mm calculate the length of the tube. Neglect the resistance of the scale, if any formed.

 

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