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(b) Figure 2.1 shows a double-pipe heat exchanger is constructed of a stainless steel (k =15.1 W/m.°C) inner tube of inner diameter D; = 1.5 cm and outer diameter Do = 1.9 cm and an outer shell of inner diameter 3.2cm. The convection heat transfer coefficient is given to be hi = 800 W/m².°C on the inner surface of the tube and ho = 1200 W/m².°C on the outer surface. For a fouling factor of Rf, i = 0.0004 m².°C/W on the tube side and Rf, 0 = 0.0001 m².°C/W on the shell side. Given the length of the tube is 10 m. [Rajah 5.1 menunjukkan penukar haba dua paip dibina daripada keluli tahan karat (k =15.1 W/m.°C) tiub dalam diameter dalam Dị = 1.5 cm dan diameter luar D, = 1.9 cm dan kelompang luar diameter dalam 3.2 cm. Pekali pemindahan haba perolakan diberi sebagai h; = 800 W/m².°C pada permukaan dalam tiub dan ho = 1200 W/m2-°C pada permukaan luar. Untuk faktor kotoran Rf, i = 0.0004 m².ºC/W pada bahagian tiub dan Rf 0 = 0.0001 m²?.°C/W pada bahagian kelompang. Diberi panjang tiub itu ialah 10 m.] (i) Calculate the lateral surface area of the inner and outer tube. [Kirakan luas permukaan sisi tiub dalam dan luar.] (ii) Determine the thermal resistance of the heat exchanger per unit length. [Tentukan rintangan haba penukar haba per unit panjang.] Cold fluid Cold fluid Hot fluid Outer layer of fouling - Tube wall - Inner layer of fouling Inner surface of tube Hot fluid Outer surface of tube Figure 2.1

(b) Figure 2.1 shows a double-pipe heat exchanger is constructed of a stainless steel (k =15.1 W/m.°C) inner tube of inner diameter D; = 1.5 cm and outer diameter Do = 1.9 cm and an outer shell of inner diameter 3.2cm. The convection heat transfer coefficient is given to be hi = 800 W/m².°C on the inner surface of the tube and ho = 1200 W/m².°C on the outer surface. For a fouling factor of Rf, i = 0.0004 m².°C/W on the tube side and Rf, 0 = 0.0001 m².°C/W on the shell side. Given the length of the tube is 10 m. [Rajah 5.1 menunjukkan penukar haba dua paip dibina daripada keluli tahan karat (k =15.1 W/m.°C) tiub dalam diameter dalam Dị = 1.5 cm dan diameter luar D, = 1.9 cm dan kelompang luar diameter dalam 3.2 cm. Pekali pemindahan haba perolakan diberi sebagai h; = 800 W/m².°C pada permukaan dalam tiub dan ho = 1200 W/m2-°C pada permukaan luar. Untuk faktor kotoran Rf, i = 0.0004 m².ºC/W pada bahagian tiub dan Rf 0 = 0.0001 m²?.°C/W pada bahagian kelompang. Diberi panjang tiub itu ialah 10 m.] (i) Calculate the lateral surface area of the inner and outer tube. [Kirakan luas permukaan sisi tiub dalam dan luar.] (ii) Determine the thermal resistance of the heat exchanger per unit length. [Tentukan rintangan haba penukar haba per unit panjang.] Cold fluid Cold fluid Hot fluid Outer layer of fouling - Tube wall - Inner layer of fouling Inner surface of tube Hot fluid Outer surface of tube Figure 2.1

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter7: Forced Convection Inside Tubes And Ducts
Section: Chapter Questions
Problem 7.46P
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HEAT TRANSFER SUBJECT

(b) Figure 2.1 shows a double-pipe heat exchanger is constructed of a stainless steel (k =15.1 W/m.°C) inner tube of inner diameter D; = 1.5 cm and outer diameter Do = 1.9 cm and an outer shell of inner diameter 3.2cm. The convection heat transfer coefficient is given to be h; = 800 W/m².°C on the inner surface of the tube and ho = 1200 W/m²-°C on the outer surface. For a fouling factor of Rf, i = 0.0004 m?.°C/W on the tube side and Rf.0 = 0.0001 m².°C/W on the shell side. Given the length of the tube is 10 m. [Rajah 5.1 menunjukkan penukar haba dua paip dibina daripada keluli tahan karat (k =15.1 W/m.°C) tiub dalam diameter dalam D; = 1.5 cm dan diameter luar D. = 1.9 cm dan kelompang luar diameter dalam 3.2 cm. Pekali pemindahan haba perolakan diberi sebagai h; = 800 W/m?.°C pada permukaan dalam tiub dan ho = 1200 W/m2-°C pada permukaan luar. Untuk faktor kotoran Rf, i = 0.0004 m².ºC/W pada bahagian tiub dan Rf.0 = 0.0001 m².ºC/W pada bahagian kelompang. Diberi panjang tiub itu ialah 10 m.] (i) Calculate the lateral surface area of the inner and outer tube. [Kirakan luas permukaan sisi tiub dalam dan luar.] (ii) Determine the thermal resistance of the heat exchanger per unit length. [Tentukan rintangan haba penukar haba per unit panjang.] Cold fluid Cold fluid Hot Outer layer of fouling fluid -Tube wall Inner layer of fouling Inner surface of tube Hot fluid Outer surface of tube Figure 2.1
Transcribed Image Text:(b) Figure 2.1 shows a double-pipe heat exchanger is constructed of a stainless steel (k =15.1 W/m.°C) inner tube of inner diameter D; = 1.5 cm and outer diameter Do = 1.9 cm and an outer shell of inner diameter 3.2cm. The convection heat transfer coefficient is given to be h; = 800 W/m².°C on the inner surface of the tube and ho = 1200 W/m²-°C on the outer surface. For a fouling factor of Rf, i = 0.0004 m?.°C/W on the tube side and Rf.0 = 0.0001 m².°C/W on the shell side. Given the length of the tube is 10 m. [Rajah 5.1 menunjukkan penukar haba dua paip dibina daripada keluli tahan karat (k =15.1 W/m.°C) tiub dalam diameter dalam D; = 1.5 cm dan diameter luar D. = 1.9 cm dan kelompang luar diameter dalam 3.2 cm. Pekali pemindahan haba perolakan diberi sebagai h; = 800 W/m?.°C pada permukaan dalam tiub dan ho = 1200 W/m2-°C pada permukaan luar. Untuk faktor kotoran Rf, i = 0.0004 m².ºC/W pada bahagian tiub dan Rf.0 = 0.0001 m².ºC/W pada bahagian kelompang. Diberi panjang tiub itu ialah 10 m.] (i) Calculate the lateral surface area of the inner and outer tube. [Kirakan luas permukaan sisi tiub dalam dan luar.] (ii) Determine the thermal resistance of the heat exchanger per unit length. [Tentukan rintangan haba penukar haba per unit panjang.] Cold fluid Cold fluid Hot Outer layer of fouling fluid -Tube wall Inner layer of fouling Inner surface of tube Hot fluid Outer surface of tube Figure 2.1
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