H.W. 4.1. Consider a regenerative cycle using steam as the working fluid . Steam leaves the boiler and enters the turbine at 4 MPa, 400 oC. After expansion to 400 kPa, some of the steam is extracted from the turbine for the purpose of heating the feedwater in an open feedwater heater. The pressure in the feedwater heater is 400 kPa and the water leaving it is saturated liquid at 400 kPa. The steam not extracted expands to 10 kPa. Determine the cycle efficiency. Answers: 37.5%

H.W. 4.1. Consider a regenerative cycle using steam as the working fluid . Steam leaves the boiler and enters the turbine at 4 MPa, 400 oC. After expansion to 400 kPa, some of the steam is extracted from the turbine for the purpose of heating the feedwater in an open feedwater heater. The pressure in the feedwater heater is 400 kPa and the water leaving it is saturated liquid at 400 kPa. The steam not extracted expands to 10 kPa. Determine the cycle efficiency. Answers: 37.5%

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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Q2) Consider a steam power plant that operates on a simple Rankine cycle and has a net power output of 45 MW. Steam enters the turbine at 7 MPa and 500°C and is cooled in the condenser at a pressure of 10 kPa by running cooling water from a lake through the tubes of the condenser at a rate of 2000 kg/s, note that steam enter pump with enthalpy 191.81kJ/kg and enter turbine with enthalpy 3411.4kJ/kg and entropy 6.8 kJ/kg.k assuming an isentropic efficiency of 87 percent for both the turbine and the pump determine (a) the thermal efficiency of the cycle, (b) the temperature rise of the cooling water.
Q4) Steam generated in a power plant at a pressure of 5500 kPa and a temperature of 420°C is fed to a turbine. Exhaust from the turbine enters a condenser at 20 kPa where it is condensed to saturated liquid, which then pumped to the boiler. Determine the thermal efficiency of a Rankin cycle operating at these conditions.
A binary vapor cycle has mercury and water as its working fluids. If the efficiency of the mercury cycle is 32% while the steam cycle is 32.7%, compute the overall efficiency of the binary vapor cycle in %.
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…
2. An electrical power plant that uses the Rankine cycle has a pump to increase the water pressure and multiply it by 50. In addition, there is a boiler whose fuel has a calorific value of 35 MJ/kg. The water that enters the process has a temperature of 60 °C and is at atmospheric pressure. The steam that leaves the turbine has a quality of 70% and the work generated in the turbine is 300 MW. a. How much water is needed to run the plant? b. What is its efficiency?
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power plant has steam entering at 70 bar, 450°C into HP turbine. Steam is extracted at 30 bar and reheated up to 400°C before being expanded in LP turbine upto 0.075 bar. Some portion of steam is bled out during expansion in LP turbine so as to yield saturated liquid at 140°C at the exit of open feed water heater. Considering HP and LP turbine efficiencies of 80% and 85% determine the cycle efficiency. Also give layout and T-s diagram.
6.2) There is a regenerative cycle that uses steam as the working fluid. Steam leaves the boiler and enters the turbine at 4 MPa and 400°C. After an expansion to 400 kPa, part of the steam is withdrawn from the turbine in order to heat the feedwater in an open feedwater heater (FWH). The pressure in the heater is 400 kPa, the water that leaves is a saturated liquid at 400 kPa, and the non-extracted steam expands at 10 kPa. Determine the efficiency of the cycle Boiler Turbine T Water boiler Condenser B Pump 2 Be Pump 1 Ans: Ans: NT-37%
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 8 MPa (points B & C) and the condenser operates at 200 kPa (points A & D). Assume a mass flow rate of 1 kg/s. Make a table of the temperature, pressure, volume, internal energy, enthalpy, entropy and…
2.please solve
This is thermodynamics 2
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