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Q6: Water at 0.8 kg/s enters the tubes of a two-shell-pass, four-tube-pass heat exchanger at 17 C and leaves at 37 C. It cools 0.5 kg/s of air entering the shell at 250 C with U=432 W/m².K. Determine: (a) the exit air temperature; (b) the area of heat exchanger; and (c) the exit temperature if, after some time, the tubes become fouled with R = 0.0005 m² K/W.(d) the Poor efficiency ratio after this time?Assume F=1, Cp air 1.03kJ/kg K.

Q6: Water at 0.8 kg/s enters the tubes of a two-shell-pass, four-tube-pass heat exchanger at 17 C and leaves at 37 C. It cools 0.5 kg/s of air entering the shell at 250 C with U=432 W/m².K. Determine: (a) the exit air temperature; (b) the area of heat exchanger; and (c) the exit temperature if, after some time, the tubes become fouled with R = 0.0005 m² K/W.(d) the Poor efficiency ratio after this time?Assume F=1, Cp air 1.03kJ/kg K.

Introduction to Chemical Engineering Thermodynamics
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
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Q6: Water at 0.8 kg/s enters the tubes of a two-shell-pass, four-tube-pass heat exchanger at 17 C and leaves at 37 C. It cools 0.5 kg/s of air entering the shell at 250 C with U=432 W/m².K. Determine: (a) the exit air temperature; (b) the area of heat exchanger; and (c) the exit temperature if, after some time, the tubes become fouled with R = 0.0005 m² K/W.(d) the Poor efficiency ratio after this time?Assume F=1, Cp air 1.03kJ/kg K.
Transcribed Image Text:Q6: Water at 0.8 kg/s enters the tubes of a two-shell-pass, four-tube-pass heat exchanger at 17 C and leaves at 37 C. It cools 0.5 kg/s of air entering the shell at 250 C with U=432 W/m².K. Determine: (a) the exit air temperature; (b) the area of heat exchanger; and (c) the exit temperature if, after some time, the tubes become fouled with R = 0.0005 m² K/W.(d) the Poor efficiency ratio after this time?Assume F=1, Cp air 1.03kJ/kg K.
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