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.
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 7.3DP
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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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