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14. A 6-foot-long circular pipe used to transfer hot water has inner and outer diameters of 1 inch and 1.25 inches, respectively. The pipe is made of copper. The copper alloy is unknown. Inside the pipe, hot water (170 °F) flows very quickly (average velocity is 20 ft/sec.) The convective heat transfer coefficient between the flowing water and the inside of the pipe is unknown. The properties for water at this temperature are: Thermal Conductivity = 0.385 Btu/hr-ft-°F Specific Heat = 1.001 Btu/lbm-°F Density = 61 lbm/ft³ The environment outside the pipe is 73 °F air and the convective heat transfer coefficient is 2.2 Btu/hr-ft²-°F. 170 °F water flow at 20 ft/sec Room air, 73 °F, heat transfer coefficient - 2.2 6 feet A 1 inch 1. Estimate the rate of heat transfer and the air. 1.25 inches from the flowing water 2. Estimate the temperature change of the water as it moves through the 6-foot length of pipe. Hint: The mass flowrate of the water is: PAV, where is the average velocity of the pipe.

14. A 6-foot-long circular pipe used to transfer hot water has inner and outer diameters of 1 inch and 1.25 inches, respectively. The pipe is made of copper. The copper alloy is unknown. Inside the pipe, hot water (170 °F) flows very quickly (average velocity is 20 ft/sec.) The convective heat transfer coefficient between the flowing water and the inside of the pipe is unknown. The properties for water at this temperature are: Thermal Conductivity = 0.385 Btu/hr-ft-°F Specific Heat = 1.001 Btu/lbm-°F Density = 61 lbm/ft³ The environment outside the pipe is 73 °F air and the convective heat transfer coefficient is 2.2 Btu/hr-ft²-°F. 170 °F water flow at 20 ft/sec Room air, 73 °F, heat transfer coefficient - 2.2 6 feet A 1 inch 1. Estimate the rate of heat transfer and the air. 1.25 inches from the flowing water 2. Estimate the temperature change of the water as it moves through the 6-foot length of pipe. Hint: The mass flowrate of the water is: PAV, where is the average velocity of the pipe.

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
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14. A 6-foot-long circular pipe used to transfer hot water has inner and outer diameters of 1 inch and 1.25 inches, respectively. The pipe is made of copper. The copper alloy is unknown. Inside the pipe, hot water (170 °F) flows very quickly (average velocity is 20 ft/sec.) The convective heat transfer coefficient between the flowing water and the inside of the pipe is unknown. The properties for water at this temperature are: Thermal Conductivity = 0.385 Btu/hr-ft-°F Specific Heat = 1.001 Btu/lbm-°F Density= = 61 lbm/ft³ The environment outside the pipe is 73 °F air and the convective heat transfer coefficient is 2.2 Btu/hr-ft²-°F. 170 °F water flow at 20 ft/sec Room air, 73 °F. heat transfer coefficient = 2.2 6 feet inch 1.25 inches 1. Estimate the rate of heat transfer from the flowing water and the air. 2. Estimate the temperature change of the water as it moves through the 6-foot length of pipe. Hint: The mass flowrate of the water is: PAV, where is the average velocity of the pipe.
Transcribed Image Text:14. A 6-foot-long circular pipe used to transfer hot water has inner and outer diameters of 1 inch and 1.25 inches, respectively. The pipe is made of copper. The copper alloy is unknown. Inside the pipe, hot water (170 °F) flows very quickly (average velocity is 20 ft/sec.) The convective heat transfer coefficient between the flowing water and the inside of the pipe is unknown. The properties for water at this temperature are: Thermal Conductivity = 0.385 Btu/hr-ft-°F Specific Heat = 1.001 Btu/lbm-°F Density= = 61 lbm/ft³ The environment outside the pipe is 73 °F air and the convective heat transfer coefficient is 2.2 Btu/hr-ft²-°F. 170 °F water flow at 20 ft/sec Room air, 73 °F. heat transfer coefficient = 2.2 6 feet inch 1.25 inches 1. Estimate the rate of heat transfer from the flowing water and the air. 2. Estimate the temperature change of the water as it moves through the 6-foot length of pipe. Hint: The mass flowrate of the water is: PAV, where is the average velocity of the pipe.
Expert Solution
Step 1

Given That:

Inner Diameter = 1 inch

outer diameter = 1.25 inch

temperature of water = 170 0F

Average velocity = 20 ft/sec

Thermal conductivity = 0.385 Btu/hr-ft-0F

Convective heat transfer coefficient = 2.2 Btu/hr-ft2-0F

 

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