Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN: 9781305387102
Author: Kreith, Frank; Manglik, Raj M.
Publisher: Cengage Learning
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Chapter 10, Problem 10.7P
To determine
Overall heat transfer coefficient after fouling.
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1. Consider the following schematic of a power plant (operating in what is called a
'Rankine Cycle')
Turbine
Steam
generator
Condenser
Coling water
Economiaer
The power plant control room reports that the plant is operating continuously at the following
peak load conditions:
a. Power to pump = 300KW
b. Rate of steam flow = 25 kg/s
c. Cooling water temperature at condenser inlet = 13 C
d. Cooling water temperature at condenser outlet = 34 C
Additionally, the following measurements were made at various points in the piping connecting
the power plant components
Data Pressure Temp. Quality enthalpy Specific Velocity
(kJ/kg)
point (kPa)
volume (m/s)
(m3/kg)
(C)
(x)
1
6200
2
6100
43
5900
177
----
4.
5700
493
-----
5
5500
482
-----
6
103
0.94
183
7
96
43
-----
A shell-and-tube heat exchanger is made of two standard steel tubes, as shown in Fig. 9.13 . The outer tube has an OD of 7/8 in and the OD for the inner tube is ½ in. Each tube has a wall thickness of 0.049 in. Calculate the required ratio of the volume flow rate in the shell to that in the tube if the average velocity of flow is to be the same in each.
Answer is Qshell/ Qtube= 2.19. Please show how to solve.
Problem 01
Find the least number of 150 mm diameter pipes required to transmit 170 kW
to a machine 3.2 km from the power station, if the efficiency of transmission
is to be 90 per cent and f= 0.0075. The feed pressure is 4800 kN/m².
Collutate of Pipes required
efficiency=
Problem 02
A turbine of efficiency 78% is 750 m lower than the supply water source. The
pipe supplying the turbine with water is 200 mm in diameter and 4,5 km long.
Take f=0,008 and determine the maximum power output that can be expected
from the turbine.
Problem 03
A pipeline is 1800 m long and 375 mm in diameter, and supply head at inlet
is 240 m. A nozzle with an effective diameter of 50 mm is fitted at the discharge
end and has a coefficient of velocity of 0,972. If for the pipe is 0,005.
(a) The velocity of the jet
(b) The discharge
(c) The power of the jet
C1Reg
Chapter 10 Solutions
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
Ch. 10 -
10.1 In a heat exchanger, as shown in the...Ch. 10 - Prob. 10.2PCh. 10 -
10.3 A light oil flows through a copper tube of...Ch. 10 - Prob. 10.4PCh. 10 - Water flowing in a long, aluminum lube is to be...Ch. 10 - Mot water is used to heat air in a double-pipe...Ch. 10 - Prob. 10.7PCh. 10 -
10.8 The heat transfer coefficient of a copper...
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- 10. Recall when you were collecting data for the Entrance Loss experiment, there was a ten second delay before the data was posted in Excel. Why was there a delay, and why was it important? 11. Were your theoretical entrance loss factors, KL, higher or lower than your experimental value? What may be some causes for each entrance type? Concentric Tube Heat Exchanger 12. Why was it difficult to achieve steady-state conditions? 13. List at least two assumptions that are being made in the Heat Exchanger experiment, and explain the reasons why they are approximations. 14. What are thermal and hydrodynamic entrance lengths? Are either (or both) of them an issue for the experiment? Why or why not?arrow_forwardProblem -1 A tank is initially empty. A liquid with p = 62.4 Ibm/ft is poured into the tank at a constant mass flow rate of mi = 7 lbm/s. The tank has cross-sectional area A = 0.2 fe, and the fluid in the tank has a %3D variable height H(t). There is a hole at the bottom of the tank. The fluid flows out of the tank at a rate proportional to the fluid height: rme = kH, where k= 1.4 lbm/ft/s. Find H(t). A sketch is given in Fig. P.1. Figure.P.1: Sketch of tank filling problemarrow_forwardWILEY 10.75 PLUS A heat exchanger consists of a closed system with a series of parallel tubes connected by 180° elbows as shown in the figure. There are a total of 14 return elbows. The pipe diameter is 2 cm, and the total pipe length is 10 m. The head loss coefficient for each return elbow is 2.2. The tube is copper. Water with an average temperature of 40°C flows through the system with a mean velocity of 8 m/s. Find the power required to operate the pump if the pump is 85% efficient.arrow_forward
- In a heat exchanger, water flows through a long copper tube (inside diameter 2.2 cm) with an average velocity of 2.13 m/s. The water is heated by steam condensing at 150 degree celsius on the outside of the tube. Water enters at 15 degree Celsius and leaves at 60 degree Celsius . What is the heat transfer coefficient, h, for the water? Write the given, required and solutionarrow_forward11 MWth plant operates at a thermal efficiency of 34%. The waste heat is dumped across a condenser which operates at a shell side pressure of 0.717 psia. For the given information below, determine the condenser tube length. A Coolant Flow Rate 4.81 x 108 Ibm/hr Coolant Inlet Temperature 60 F Number of Tubes 62,832 Lattice triangular Pitch 1.5 inch Tube OD 1 inch Tube ID 0.944 inch Tube Thermal Conductivity 10 Btu/hr-ft-F Condensing Heat Transfer Coefficient 1228 Btu/hr-ft²-Farrow_forwardIt is required to pump cooling water from storage pond to a condenser in a process plant situated 10 m above the level of the pond. 200 m of 74.2 mm i.d.pipe is available and the pump has the characteristics given below. The head loss in the condenser is equivalent to 16 velocity heads based on the flow in the 74.2 mm pipe. If the friction factor -0.003, estimate the rate of flow and the power to be supplied to the pump assuming -0.5. Q(m/s) 0,0028 0.0039 0.005 0.0056 0.0059 23.2 21.3 18.9 15.2 11.0 ΔΗ (13)arrow_forward
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Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning
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