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The condenser of a steam power plant contains N = 1000 brass tubes (k = 110 W/m.K), each of inner and outer diameters, D, = 25 mm and D. = 28 mm, respectively. Steam condensation on the outer surfaces of the tube is characterized by a convection coefficient h, = 10,000 W/m².K a) If cooling water from a large take is pumped through the condenser tubes at m, = k = 400 kg/s, what is the overall heat transfer coefficient U, based on the outer surface area of a tube? b) If after extended operation, fouling provides a resistance of R's = 1oʻm².K/W, at the inner surface, what is the value of U,? c) If m, is increased by 15% of the initial, what will be the value of U.? d) If water is extracted from the lake at 15°C and 10 kg/s of steam at 0.0622 bars are to be condensed, what is the corresponding temperature of the water leaving the condenser?

The condenser of a steam power plant contains N = 1000 brass tubes (k = 110 W/m.K), each of inner and outer diameters, D, = 25 mm and D. = 28 mm, respectively. Steam condensation on the outer surfaces of the tube is characterized by a convection coefficient h, = 10,000 W/m².K a) If cooling water from a large take is pumped through the condenser tubes at m, = k = 400 kg/s, what is the overall heat transfer coefficient U, based on the outer surface area of a tube? b) If after extended operation, fouling provides a resistance of R's = 1oʻm².K/W, at the inner surface, what is the value of U,? c) If m, is increased by 15% of the initial, what will be the value of U.? d) If water is extracted from the lake at 15°C and 10 kg/s of steam at 0.0622 bars are to be condensed, what is the corresponding temperature of the water leaving the condenser?

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
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The condenser of a steam power plant contains N = 1000 brass tubes (k = 110 W/m.K), each of inner and outer diameters, D; = 25 mm and D. = 28 mm, respectively. Steam condensation on the outer surfaces of the tube is characterized by a convection coefficient h, = 10,000 W/m².K a) If cooling water from a large take is pumped through the condenser tubes at m, = 400 kg/s, what is the overall heat transfer coefficient U. based on the outer surface area of a tube? b) If after extended operation, fouling provides a resistance of R'r = 10“ m².K/W, at the nner surface, what is the value of U,? c) If m, is increased by 15% of the initial, what will be the value of U.? d) If water is extracted from the lake at 15°C and 10 kg/s of steam at 0.0622 bars are to be condensed, what is the corresponding temperature of the water leaving the condenser?
Transcribed Image Text:The condenser of a steam power plant contains N = 1000 brass tubes (k = 110 W/m.K), each of inner and outer diameters, D; = 25 mm and D. = 28 mm, respectively. Steam condensation on the outer surfaces of the tube is characterized by a convection coefficient h, = 10,000 W/m².K a) If cooling water from a large take is pumped through the condenser tubes at m, = 400 kg/s, what is the overall heat transfer coefficient U. based on the outer surface area of a tube? b) If after extended operation, fouling provides a resistance of R'r = 10“ m².K/W, at the nner surface, what is the value of U,? c) If m, is increased by 15% of the initial, what will be the value of U.? d) If water is extracted from the lake at 15°C and 10 kg/s of steam at 0.0622 bars are to be condensed, what is the corresponding temperature of the water leaving the condenser?
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