Problem 6: Consider the cycle in the diagram (very similar to the Rankine Cycle) using water as the working fluid. Process A-B: Saturated liquid water is pumped from low to high pressure in an iso-entropic process. (Also assume an adiabatic process.) Process B-C: The high pressure liquid enters a boiler where it is heated at constant pressure process by an external heat source to a saturated vapor. Process C-D: The saturated vapor expands through a turbine, generating power. Assume an adiabatic process and neglect kinetic energy and potential energy changes. Process D-A: The vapor then enters a condenser where it is condensed at a constant pressure process back to its original state. D. The boiler operates at 5 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.
Problem 6: Consider the cycle in the diagram (very similar to the Rankine Cycle) using water as the working fluid. Process A-B: Saturated liquid water is pumped from low to high pressure in an iso-entropic process. (Also assume an adiabatic process.) Process B-C: The high pressure liquid enters a boiler where it is heated at constant pressure process by an external heat source to a saturated vapor. Process C-D: The saturated vapor expands through a turbine, generating power. Assume an adiabatic process and neglect kinetic energy and potential energy changes. Process D-A: The vapor then enters a condenser where it is condensed at a constant pressure process back to its original state. D. The boiler operates at 5 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.
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:Problem 6:
Consider the cycle in the diagram (very similar to the Rankine Cycle) using water as the working fluid.
Process A-B: Saturated liquid water is pumped from low to high pressure in
an iso-entropic process. (Also assume an adiabatic process.)
Process B-C: The high pressure liquid enters a boiler where it is heated at
constant pressure process by an external heat source to a saturated vapor.
Process C-D: The saturated vapor expands through a turbine, generating
power. Assume an adiabatic process and neglect kinetic energy and potential
energy changes.
Process D-A: The vapor then enters a condenser where it is condensed at a
constant pressure process back to its original state.
D
The boiler operates at 5 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.
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