Steam in a heating system flows through tubes whose outer diameter is 5 cm and whose walls are maintained at a temperature of 198.06°C. Circular copper alloy fins (k =285 W/m · °C) of outer diameter 6 cm and constant thickness 1 mm are attached to the tube. 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 water at T= 43.06°C, with a heat transfer coefficient of 5300 W/m2 · °C. Determine the increase in heat transfer from the tube per meter of its length as a result of adding fins and fin effectiveness

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Steam in a heating system flows through tubes whose outer diameter is 5 cm and whose walls are maintained at a temperature of 198.06°C. Circular copper alloy fins (k =285 W/m · °C) of outer diameter 6 cm and constant thickness 1 mm are attached to the tube. 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 water at T= 43.06°C, with a heat transfer coefficient of 5300 W/m2 · °C. Determine the increase in heat transfer from the tube per meter of its length as a result of adding fins and fin effectiveness

Steam in a heating system flows through tubes whose outer diameter is 5
cm and whose walls are maintained at a temperature of 198.06°C.
Circular copper alloy fins (k =285 W/m C) of outer diameter 6 cm and
constant thickness 1 mm are attached to the tube. 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 water at T= 43.06°C, with a heat
transfer coefficient of 5300 W/m2 - °C. Determine the increase in heat
transfer from the tube per meter of its length as a result of adding fins
and fin effectiveness*
25 cm
3 cm
Imm
3 mm
Q total=(270000 W- 292000 W); e=(2.0-2.3)
Q total=(380000 W- 391000 W); e=(3.0-3.4)
answer is not within
Q total=(300000 W- 312000 W); e=(2.2.0-2.5)
Q total=(185000 W- 192000 W); e=(3.0-3.4)
Q total=(548000 W- 554000 W); e=(2.2.0-2.8)
Transcribed Image Text:Steam in a heating system flows through tubes whose outer diameter is 5 cm and whose walls are maintained at a temperature of 198.06°C. Circular copper alloy fins (k =285 W/m C) of outer diameter 6 cm and constant thickness 1 mm are attached to the tube. 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 water at T= 43.06°C, with a heat transfer coefficient of 5300 W/m2 - °C. Determine the increase in heat transfer from the tube per meter of its length as a result of adding fins and fin effectiveness* 25 cm 3 cm Imm 3 mm Q total=(270000 W- 292000 W); e=(2.0-2.3) Q total=(380000 W- 391000 W); e=(3.0-3.4) answer is not within Q total=(300000 W- 312000 W); e=(2.2.0-2.5) Q total=(185000 W- 192000 W); e=(3.0-3.4) Q total=(548000 W- 554000 W); e=(2.2.0-2.8)
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