Calculate overall heat flow, mass flow of water, heat transfer coefficient on the outer side of the tube,overall heat transfer coefficient and the length of exchanger .

Input temperature of water is 15 °C and output temperature is 25 °C. Heat transfer coefficient inside the tube is 1000 W.m-2.K-1. Calculate overall heat flow, mass flow of water, heat transfer coefficient on the outer side of the tube,overall heat transfer coefficient and the length of exchanger .Result: Total heat flow is 140 kW, mass flow of water is 3.33 kg.s-1, heat transfer coefficient on the outer tube side is 1055 W.m-2.K-1, overall heat transfer coefficient is 35.9 W.m-1.K-1 and the length of exchanger is 6.06 m.VII.3 Vapour of pure ethanol at 78°C is fed into a counter current condenser. All of the vapour is condensed and then the condensate is subcooled to 20°C. As a cooling media, 0.28 kg.s-1 of cooling water is used. The water enters at temperature of 10°C and leaves at 65°C. The overall heat transfer coefficient for condensation is 1400 W.m-2.K-1


 

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