Methyl alcohol flowing in the inner pipe of a double-pipe exchanger is cooled with water flowing in the jacket. The inner pipe is made from 1-in (25-mm) Schedule 40 steel pipe. The thermal conductivity of steel is 26 BTU/hr-ft-°F (45 W/m-°C). The individual coefficients and fouling factors are hi = 180 BTU/ft²- hr-°F (1020 W/m²-°C) , hdi = 1000 BTU/ft²-hr-°F (5680 W/m²-°C) , ho = 600 BTU/ft²-hr-°F (5680 W/m²-°C) , hdo = 500 BTU/ft²-hr-°F (2840 W/m²-°C). What is the overall coefficient based on the outside area of the inner pipe in BTU/ft² hr-°F? A. 80.9      B. 84.2      C. 85.1       D. 86.5

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
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Methyl alcohol flowing in the inner pipe of a double-pipe exchanger is cooled with water flowing in the jacket. The inner pipe is made from 1-in (25-mm) Schedule 40 steel pipe. The thermal conductivity of steel is 26 BTU/hr-ft-°F (45 W/m-°C). The individual coefficients and fouling factors are hi = 180 BTU/ft²-
hr-°F (1020 W/m²-°C) , hdi = 1000 BTU/ft²-hr-°F (5680 W/m²-°C) , ho = 600 BTU/ft²-hr-°F (5680 W/m²-°C) , hdo = 500 BTU/ft²-hr-°F (2840 W/m²-°C). What is the overall coefficient based on the outside area of the inner pipe in BTU/ft² hr-°F?
A. 80.9      B. 84.2      C. 85.1       D. 86.5

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