Fundamentals Of Engineering Thermodynamics
9th Edition
ISBN: 9781119391388
Author: MORAN, Michael J., SHAPIRO, Howard N., Boettner, Daisie D., Bailey, Margaret B.
Publisher: Wiley,
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Chapter 4, Problem 4.68P
To determine
The mass flow rate of cooling rate.
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Steam enters the first-stage turbine shown in Figure (right) at 40 bar and 500°C with a volumetric flow rate of
90 m³/min. Steam exits the turbine at 20 bar and 400°C. The steam is then reheated at constant pressure to
500°C before entering the second-stage turbine. Steam leaves the second stage as saturated vapor at 0.6 bar.
For operation at steady state, and ignoring
stray heat transfer and kinetic and potential
energy effects, determine the
a. mass flow rate of the steam, in kg/h.
b. total power produced by the two stages of
the turbine, in kW.
Steam +
P₁ = 40 bar
T₁=500°C
(AV), -90 m³/min
Turbine
P=20 bar
7₂-400°C
2
Reheater
Qecheater
Turbine
20 bar
T₁-500°C
Saturated
vapor.
P4-0.6 bar
Power
Steam enters the condenser of a vapor power plant at 0.60 bar with a quality of 0.90 and condensate exits at 0.60 bar and 33°C. Cooling water enters the condenser in a separate stream as a liquid at 24°C and exits as a liquid at 36°C with no change in pressure. Heat transfer from the outside of the condenser and changes in the kinetic and potential energies of the flowing streams can be ignored. For steady-state operation, determine the energy transfer from the condensing steam to the cooling water, in kJ per kg of steam passing through the condenser.
Select one:
a. -2900.16 kJ/kg
b. -2105.36 kJ/kg
c. -2285.81 kJ/kg
d. 2276.70 kJ/kg
Steam enters the condenser of a vapor power plant at 0.60 bar with a quality of 0.90 and condensate exits at 0.60 bar and 33°C. Cooling water enters the condenser in a separate stream as a liquid at 24°C and exits as a liquid at 36°C with no change in pressure. Heat transfer from the outside of the condenser and changes in the kinetic and potential energies of the flowing streams can be ignored. For steady-state operation, determine the energy transfer from the condensing steam to the cooling water, in kJ per kg of steam passing through the condenser.
Chapter 4 Solutions
Fundamentals Of Engineering Thermodynamics
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