(1) In a double tube heat exchanger in which hot and cold fluids flow into a countercurrent flow, the temperature of the hot fluid dropped from 60°C to 30°C, and the temperature of the cold fluid rose from 20°C to 55°C. Calculate the heat flux [kcal/m2h] when the overall heat transfer coefficient of this heat exchanger is constant at 69 kcal/m2h℃.
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.
Answer the following questions about heat transfer in a double tube heat exchanger.
(1) In a double tube heat exchanger in which hot and cold fluids flow into a countercurrent flow, the temperature of the hot fluid dropped from 60°C to 30°C, and the temperature of the cold fluid rose from 20°C to 55°C. Calculate the heat flux [kcal/m2h] when the overall heat transfer coefficient of this heat exchanger is constant at 69 kcal/m2h℃.
(2) In a double tube heat exchanger in which hot and cold fluids flow in parallel flow, the temperature of the hot fluid dropped from 60°C to 45°C, and the temperature of the cold fluid rose from 20°C to 40°C. When the heat flux of this heat exchanger is 600 kcal/m2h, calculate the overall heat transfer coefficient of this heat exchanger [kcal/m2h℃].
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θm=θ1-θ2lnθ1θ2=Thi-Tco-Tho-TcilnThi-TcoTho-Tci=60-55-30-20ln60-5530-20=7.2135 °C
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