Chemical Engineering :: Heat Transfer
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1000 Kg of liquid at 30°C in a well stirred vessel has to be heated to 120°C, using immersed coils carrying condensing steam at 150°C. The area of the steam coils is 1.2 m2 and the overall heat transfer co-efficient to the liquid is 1500 W/m2.°C. Assuming negligible heat loss to the surrounding and specific heat capacity of the liquid to be 4 kJ/kg.°C, the time taken for the liquid to reach desired temperature will be
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Overall thermal resistance for conductive heat transfer through a series of flat resistances is equal to the
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Double pipe heat exchangers are preferably useful, when
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Removal of __________ heat is involved in the condensation of a vapor under saturated conditions.
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The rate of heat transfer from a vertical plate by natural convection depends upon the temperature differences (ΔT) between wall and outside bulk. The proportionality is given as
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If air (a non-condensing gas) is present in a condensing vapor stream, it will __________ the condensation rate of vapor.
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The outlet temperature of cooling water in a heat exchanger is generally not allowed to exceed above 50°C in industrial practice mainly to avoid
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In evaporators, lowering the feed temperature
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