Consider the cycle in the diagram (very similar to the Rankine Cycle) using water as the working fluid. Process A-B: A saturated mixture of water is pumped from low pressure to a high pressure saturated liquid in an iso-entropic (and adiabatic) process. Process B-C: The high pressure saturated liquid enters a boiler where it is heated at constant pressure process by an external heat source to a super-heated vapor. Process C-D: The super-heated vapor goes through a turbine, generating power exiting as a saturated vapor. Assume an iso-entropic (and adiabatic) process and neglect kinetic energy and potential energy changes. Process D-A: The saturated vapor then enters a condenser where it is condensed at a constant pressure process back to its original state. The boiler operates at 10 MPa (points B & C) and the condenser operates at100 kPa (points A & D). Assume a mass flow rate of 1 kg/s. a) Make a table of the temperature, pressure, volume, internal energy, enthalpy, entropy and quality factor (T, P, V, U, H, S & x) at the start of each process. b) Make a table of the change in internal energy, heat flow, work done, change in enthalpy, and change in entropy (AU, Q, W, AH, AS) per second during each leg of the cycle. Indicate as is appropriate on the diagram. c) Calculate the thermal efficiency of the cycle. CS Scanned with CamScanner
Consider the cycle in the diagram (very similar to the Rankine Cycle) using water as the working fluid. Process A-B: A saturated mixture of water is pumped from low pressure to a high pressure saturated liquid in an iso-entropic (and adiabatic) process. Process B-C: The high pressure saturated liquid enters a boiler where it is heated at constant pressure process by an external heat source to a super-heated vapor. Process C-D: The super-heated vapor goes through a turbine, generating power exiting as a saturated vapor. Assume an iso-entropic (and adiabatic) process and neglect kinetic energy and potential energy changes. Process D-A: The saturated vapor then enters a condenser where it is condensed at a constant pressure process back to its original state. The boiler operates at 10 MPa (points B & C) and the condenser operates at100 kPa (points A & D). Assume a mass flow rate of 1 kg/s. a) Make a table of the temperature, pressure, volume, internal energy, enthalpy, entropy and quality factor (T, P, V, U, H, S & x) at the start of each process. b) Make a table of the change in internal energy, heat flow, work done, change in enthalpy, and change in entropy (AU, Q, W, AH, AS) per second during each leg of the cycle. Indicate as is appropriate on the diagram. c) Calculate the thermal efficiency of the cycle. CS Scanned with CamScanner
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Transcribed Image Text:T
B
A
D
Consider the cycle in the diagram (very similar to the Rankine Cycle) using water as the working fluid.
Process A-B: A saturated mixture of water is pumped from low pressure to a high pressure
saturated liquid in an iso-entropic (and adiabatic) process.
Process B-C: The high pressure saturated liquid enters a boiler where it is heated at constant
pressure process by an external heat source to a super-heated vapor.
Process C-D: The super-heated vapor goes through a turbine, generating power exiting as a
saturated vapor. Assume an iso-entropic (and adiabatic) process and neglect kinetic energy and
potential energy changes.
Process D-A: The saturated vapor then enters a condenser where it is condensed at a constant
pressure process back to its original state.
The boiler operates at 10 MPa (points B & C) and the condenser operates at 100 kPa (points A & D).
Assume a mass flow rate of 1 kg/s.
a) Make a table of the temperature, pressure, volume, internal energy, enthalpy, entropy and quality
factor (T, P, V, U, H, S & x) at the start of each process.
b) Make a table of the change in internal energy, heat flow, work done, change in enthalpy, and
change in entropy (AU, Q, W, AH, AS) per second during each leg of the cycle. Indicate as is
appropriate on the diagram.
c) Calculate the thermal efficiency of the cycle.
CS Scanned with CamScanner
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