Water flows at 1 kg/s in a 10 mm diameter tube and is to be heated from 25 to 75 °C. The tube surface temperature is maintained at 100 °C. Using the following properties for the water: p = 998 kg/m, Cp = 4171 J/kg K, k = 0.651 W/m K, µo = 4.71 x 10“ kg/m s, Pw = 2.82 x 104 kg/m s and Pr = 3.02. a) What is the required tube length for these conditions?

Water flows at 1 kg/s in a 10 mm diameter tube and is to be heated from 25 to 75 °C. The tube surface temperature is maintained at 100 °C. Using the following properties for the water: p = 998 kg/m, Cp = 4171 J/kg K, k = 0.651 W/m K, µo = 4.71 x 10“ kg/m s, Pw = 2.82 x 104 kg/m s and Pr = 3.02. a) What is the required tube length for these conditions?

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.

Chapter8: Natural Convection

Section: Chapter Questions

Problem 8.28P

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Water flows at 1 kg/s in a 10 mm diameter tube and is to be heated from 25 to 75 ° C. The tube surface temperature is maintained at 100 °C. Using the following properties for the water: p= 998 kg/m?, Cp = 4171 J/kg K, k = 0.651 W/m K, µs = 4.71 x 104 kg/m s, Uw = 2.82 x 104 kg/m s and Pr= 3.02. a) What is the required tube length for these conditions? b) To design a water heating system, consider using tube diameters in the range from 10 to 30 mm. What are the required tube lengths for water flow rate of 1 kg/s? Plot the tube length as a function of tube diameter.
Water flows at 1 kg/s in a 10 mm diameter tube and is to be heated from 25 to 75 ° C. The tube surface temperature is maintained at 100 °C. Using the following properties for the water: p= 998 kg/m?, Cp = 4171 J/kg K, k = 0.651 W/m K, µs = 4.71 x 104 kg/m s, Hw = 2.82 x 104 kg/m s and Pr = 3.02. a) What is the required tube length for these conditions? b) To design a water heating system, consider using tube diameters in the range from 10 to 30 mm. What are the required tube lengths for water flow rate of 1 kg/s? Plot the tube length as a function of tube diameter. c) Plot the pressure gradient as a function of the tube diameter for the given water flow rate of 1 kg/s. Assume tube wall is smooth.
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