Assuming neither the heat input nor work required by the pump do not change, what is thenew thermal efficiency of the power plant during this reduced work operation? During nominal operation, the power plant operates with the following parameters.kJ= 2823.2 2kgkJWpump,in = 4.05 kJ/kg9in9out = 1985.0kg

Answered: Assuming neither the heat input nor…

Assuming neither the heat input nor work required by the pump do not change, what is the new thermal efficiency of the power plant during this reduced work operation?

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter45: Domestic Refrigerators And Freezers

Section: Chapter Questions

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Concept explainers

Applied Fluid Mechanics

A fluid is a substance that is continuously deformed by the application of shear stress. The rate of deformation of a fluid depends on its viscosity. The fluid tries to flow when it interacts with some other system.

Question

Assuming neither the heat input nor work required by the pump do not change, what is the
new thermal efficiency of the power plant during this reduced work operation?

During nominal operation, the power plant operates with the following parameters.
kJ
= 2823.2 2
kg
kJ
Wpump,in = 4.05 kJ/kg
9in
9out = 1985.0
kg

Expert Solution

Step 1

Given data:

$q_{i n} = 2823.2 k J / k g q_{o u t} = 1985.0 k J / k g w_{p u m p, i n} = 4.05 k J / k g$

Need to determine the thermal efficiency of the power plant.

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In a steam power plant, the condenser pressure is 10 kPa. The turbine and pump isentropic efficiencies are both 85 %. Draw the schematic and T-S diagrams. Label the points by setting point 1 at the condenser outlet, point 2 at the pump outlet, point 3 at the boiler outlet, and point 4 at the turbine outlet. Use the label 2a and 4a for the points due to the isentropic efficiency of the pump and turbine, respectively. Use 2 decimal places for the enthalpy and other energies in solving and for the final answers. For the steam quality (x) and entropy (s), use 4 decimal places in solving. For the specific volume, use 6 decimal places. The pressure and the temperature of steam that enters the turbine are 4 MPa and 700 oC (use the given values assigned on your name in the table below) Determine the following: Enthalpy at point 1 in kJ/kg= Enthalpy at point 2 in kJ/kg = Enthalpy at point 3 in kJ/kg = Enthalpy at point 4 in kJ/kg = Actual Enthalpy at point 2a in kJ/kg= Actual Enthalpy at…
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