Air at 18°C (cp = 1006 J/kg·K) is to be heated to 58°C by hot oil at 80°C (cp = 2150 J/kg·K) in a cross-flow heat exchanger with air mixed and oil unmixed. The product of heat transfer surface area and the overall heat transfer coefficient is 750 W/K and the mass flow rate of air is twice that of oil. Determine (a) the effectiveness of the heat exchanger, (b) the mass flow rate of air, and (c) the rate of heat transfer.

Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
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Air at 18°C (cp = 1006 J/kg·K) is to be heated to
58°C by hot oil at 80°C (cp = 2150 J/kg·K) in a cross-flow
heat exchanger with air mixed and oil unmixed. The product
of heat transfer surface area and the overall heat transfer coefficient
is 750 W/K and the mass flow rate of air is twice that
of oil. Determine (a) the effectiveness of the heat exchanger,
(b) the mass flow rate of air, and (c) the rate of heat transfer.

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