Agricultural Engineering > GATE 2018 > Evaporators
In a falling film evaporator, the inside and outside diameters of the tube wall are 25 mm and 27 mm, respectively. The tube is made of SS304 (thermal conductivity=15 W m-1 K-1) and the inside convective film coefficient is 750 W m-2 K-1. Outside the tube wall, film coefficient of condensing steam is 7175 W m-2 K-1. Based on the inside area of the tube, the overall heat transfer coefficient is
Correct : 660
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