Counterflow to cool the oil in the lubrication system of a large industrial gas turbine. A double-pipe heat exchanger is used. Coolant flowing through the inner pipe (Cp=4178) J/kg.°C) and oil flowing through the ring channel (Cp=2005.5 J/kg.°C) mass flow rates are 0.2 and 0.4, respectively kg/s. Oil enters the heat exchanger at 60 oC and leaves at 40 oC. Water inlet temperature 30 is oC. The heat transfer coefficient on the ring side is 500 W/m2K. Diameter of thin-walled inner tube is 25 mm, the inner diameter of the outer ring is 45 mm. Pollution resistance in the inner pipe where city mains water is used It is 0.000176 m2K/W. The deposit on the oil side is negligible. a) The heat transfer coefficient in the inner pipe b) Total heat transfer coefficient, c) Calculate the length of the heat exchanger. d) If a 4 m long hairpin is used in the heat exchanger, the required number of hairpins set.
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.
Counterflow to cool the oil in the lubrication system of a large industrial gas turbine. A double-pipe heat exchanger is used. Coolant flowing through the inner pipe (Cp=4178) J/kg.°C) and oil flowing through the ring channel (Cp=2005.5 J/kg.°C) mass flow rates are 0.2 and 0.4, respectively kg/s. Oil enters the heat exchanger at 60 oC and leaves at 40 oC. Water inlet temperature 30 is oC. The heat transfer coefficient on the ring side is 500 W/m2K. Diameter of thin-walled inner tube is 25 mm, the inner diameter of the outer ring is 45 mm. Pollution resistance in the inner pipe where city mains water is used It is 0.000176 m2K/W. The deposit on the oil side is negligible. a) The heat transfer coefficient in the inner pipe b) Total heat transfer coefficient, c) Calculate the length of the heat exchanger. d) If a 4 m long hairpin is used in the heat exchanger, the required number of hairpins set.
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