3.2) In Problem 3.1 the inner pipe is made of 3-in. schedule 40 carbon steel (k = 45 W/m - K). The cold fluid flows through the inner pipe with a heat-transfer coefficient of 600 W/m² - K, while the hot fluid flows in the annulus with a heat-transfer coefficient of 1000 W/m². K. The exchanger duty is 140 kW. Calculate
3.2) In Problem 3.1 the inner pipe is made of 3-in. schedule 40 carbon steel (k = 45 W/m - K). The cold fluid flows through the inner pipe with a heat-transfer coefficient of 600 W/m² - K, while the hot fluid flows in the annulus with a heat-transfer coefficient of 1000 W/m². K. The exchanger duty is 140 kW. Calculate
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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Transcribed Image Text:(3.1) In a double-pipe heat exchanger, the cold fluid will enter at 30°C and leave at 60°C, while the hot fluid will enter at 100°C and
leave at 70°C. Find the mean temperature difference in the heat exchanger for:
(a) Co-current flow.
(b) Counter-current flow.
Ans. (a) 30.83°C.
(3.2) In Problem 3.1 the inner pipe is made of 3-in. schedule 40 carbon steel (k = 45 W/m K). The cold fluid flows through the
inner pipe with a heat-transfer coefficient of 600 W/m² K, while the hot fluid flows in the annulus with a heat-transfer
coefficient of 1000 W/m² K. The exchanger duty is 140 kW. Calculate:
(a) The average wall temperature of the inner pipe.
(b) The clean overall heat-transfer coefficient.
(c) The design overall heat-transfer coefficient using a fouling factor of 0.002 h ft² °F/Btu for each stream. (Note the units.)
(d) The total length of pipe required in the heat exchanger for counter-current flow.
(e) The total length of pipe required in the heat exchanger for co-current flow.
Ans. (a) 71.2°C. (b) 330 W/m² K. (c) 264 W/m² K. (d) 47.5 m.
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