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1. Steam in a heating system flows through tubes whose outer diameter is 5 cm and whose walls are maintained at a temperature of 180°C. Circular aluminium alloy 2024- T6 fins (k =186 W/m °C) of outer diameter 6 cm and constant thickness 1 mm are attached to the tube (see figure below). The space between the fins is 3 mm, and thus there are 250 fins per meter length of the tube. Heat is transferred to the surrounding air at T, =25°C, with a heat transfer coefficient of 40 W/m2 .°C. (Assume that there is convection at the fin tip) a) Determine the increase in heat transfer from the tube per meter of its length as a result of adding fins b) Calculate fin effectiveness (3.89) c) Percentage increase in heat transfer (74.3%) (2813.51W)

1. Steam in a heating system flows through tubes whose outer diameter is 5 cm and whose walls are maintained at a temperature of 180°C. Circular aluminium alloy 2024- T6 fins (k =186 W/m °C) of outer diameter 6 cm and constant thickness 1 mm are attached to the tube (see figure below). The space between the fins is 3 mm, and thus there are 250 fins per meter length of the tube. Heat is transferred to the surrounding air at T, =25°C, with a heat transfer coefficient of 40 W/m2 .°C. (Assume that there is convection at the fin tip) a) Determine the increase in heat transfer from the tube per meter of its length as a result of adding fins b) Calculate fin effectiveness (3.89) c) Percentage increase in heat transfer (74.3%) (2813.51W)

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Heat Transfer - Fins

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1. Steam in a heating system flows through tubes whose outer diameter is 5 cm and whose walls are maintained at a temperature of 180°C. Circular aluminium alloy 2024- T6 fins (k =186 W/m °C) of outer diameter 6 cm and constant thickness 1 mm are attached to the tube (see figure below). The space between the fins is 3 mm, and thus there are 250 fins per meter length of the tube. Heat is transferred to the surrounding air at T =25°C, with a heat transfer coefficient of 40 W/m2 .°C. (Assume that there is convection at the fin tip) a) Determine the increase in heat transfer from the tube per meter of its length as a result of adding fins (2813.51W) b) Calculate fin effectiveness (3.89) c) Percentage increase in heat transfer (74.3%) 2.5 cm 3 cm T= 25°C- 180 C I mm 3 mm
Transcribed Image Text:1. Steam in a heating system flows through tubes whose outer diameter is 5 cm and whose walls are maintained at a temperature of 180°C. Circular aluminium alloy 2024- T6 fins (k =186 W/m °C) of outer diameter 6 cm and constant thickness 1 mm are attached to the tube (see figure below). The space between the fins is 3 mm, and thus there are 250 fins per meter length of the tube. Heat is transferred to the surrounding air at T =25°C, with a heat transfer coefficient of 40 W/m2 .°C. (Assume that there is convection at the fin tip) a) Determine the increase in heat transfer from the tube per meter of its length as a result of adding fins (2813.51W) b) Calculate fin effectiveness (3.89) c) Percentage increase in heat transfer (74.3%) 2.5 cm 3 cm T= 25°C- 180 C I mm 3 mm
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