Water at a rate of 1.2 kg/s is to be heated in counter-flow double-pipe heat exchanger from 20°C to 80°C. The heating is to be accomplished by geothermal water available at 160°C at a mass flow rate of 2 kg/s. The inner tube is thin-walled and has a diameter of 1.5 cm. If the overall heat transfer coefficient of the heat exchanger is 640 W/m2 · °C, determine a) LMTD, b) rate of heat transferred, c) the length of the heat exchanger required to achieve the desired heating. NOTE: Specific heats of water and geothermal fluid to be 4.18 and 4.31 kJ/kg · °C, respectively. (four decimal places for final answer)
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 a rate of 1.2 kg/s is to be heated in counter-flow double-pipe heat exchanger from 20°C to 80°C. The heating is to be accomplished by geothermal water available at 160°C at a mass flow rate of 2 kg/s. The inner tube is thin-walled and has a diameter of 1.5 cm. If the overall heat transfer coefficient of the heat exchanger is 640 W/m2 · °C, determine a) LMTD, b) rate of heat transferred, c) the length of the heat exchanger required to achieve the desired heating.
NOTE: Specific heats of water and geothermal fluid to be 4.18 and 4.31 kJ/kg · °C, respectively.
(four decimal places for final answer)
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