(ix) State main disadvantages of using the Carnot cycle as the basis for a power station. (x) State the name of the cycle that is used in practice in power stations, along with three key benefits over the Carnot cycle.
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- A medium size power station is used to produce 30 MW net power for a refinery. The station uses steam as the operating fluid and operates according to the Carnot cycle between the pressure limits of 0.4 bar and 35 bar. Steam enters the boiler as a saturated liquid and leaves it as a dry saturated vapour.(ix) State main disadvantages of using the Carnot cycle as the basis for a power station.3. A medium size power station is used to produce 30 MW net power for a refinery. The station uses steam as the operating fluid and operates according to the Carnot cycle between the pressure limits of 0.4 bar and 35 bar. Steam enters the boiler as a saturated liquid and leaves it as a dry saturated vapour. (vii) Using the highest and lowest temperature values in the cycle, recalculate the efficiency of the cycle and show that it is equivalent to the result in part (vi). (viii) Calculate the thermal efficiency of the power station if the isentropic efficiency of the steam turbine is 94%. (ix) State main disadvantages of using the Carnot cycle as the basis for a power station. (x) State the name of the cycle that is used in practice in power stations, along with three key benefits over the Carnot cycle.2. A medium size power station is used to produce 30 MW net power for a refinery. The station uses steam as the operating fluid and operates according to the Carnot cycle between the pressure limits of 0.4 bar and 35 bar. Steam enters the boiler as a saturated liquid and leaves it as a dry saturated vapour. (i) List the name of the four processes in a generic Carnot cycle and state what type of energy transfer (work/heat) can be neglected in each process. (ii) Sketch a T-s diagram for the above cycle indicating the location of the four components required. (ii) Determine the dryness fraction of the steam that is fed to the condenser. (iv) Determine the specific enthalpy values at the four key points of the cycle. (v) Calculate the specific heat provided to the boiler, the specific work extracted from the power station and the mass flow rate of the steam circulating in the cycle (vi) Determine the thermal efficiency of the cycle. (vii) Using the highest and lowest temperature values in…
- A medium size power station is used to produce 30 MW net power for a refinery. The station uses steam as the operating fluid and operates according to the Carnot cycle between the pressure limits of 0.4 bar and 35 bar. Steam enters the boiler as a saturated liquid and leaves it as a dry saturated vapour.(ii) Sketch a T-s diagram for the above cycle indicating the location of the four components required.A medium size power station is used to produce 30 MW net power for a refinery. The station uses steam as the operating fluid and operates according to the Carnot cycle between the pressure limits of 0.4 bar and 35 bar. Steam enters the boiler as a saturated liquid and leaves it as a dry saturated vapour. (x) State the name of the cycle that is used in practice in power stations, along with three key benefits over the Carnot cycle.Solve the Rankine Cycle problems. Draw a detailed Schematic and Ts Diagram. Show a clear and detailed solutions. 1, Consider a steam power plant that operates on an ideal reheat Rankine Cycle.The Plant maintains the boiler at 8MPa, the reheat section at 700kPa.and the condenser at 10kPa. The mixture quality at the exit of both turbines is 93%. Determine the temperature at the inlet of each turbine .
- 1. A medium size power station is used to produce 30 MW net power for a refinery. The station uses steam as the operating fluid and operates according to the Carnot cycle between the pressure limits of 0.4 bar and 35 bar. Steam enters the boiler as a saturated liquid and leaves it as a dry saturated vapour. (i) List the name of the four processes in a generic Carnot cycle and state what type of energy transfer (work/heat) can be neglected in each process. (ii) Sketch a T-s diagram for the above cycle indicating the location of the four components required. (iii) Determine the dryness fraction of the steam that is fed to the condenser.A medium size power station is used to produce 30 MW net power for arefinery. The station uses steam as the operating fluid and operatesaccording to the Carnot cycle between the pressure limits of 0.4 bar and35 bar. Steam enters the boiler as a saturated liquid and leaves it as adry saturated vapour. (i) List the name of the four processes in a generic Carnot cycle andstate what type of energy transfer (work/heat) can be neglectedin each process. (ii) Determine the dryness fraction of the steam that is fed to thecondenser, and the specific enthalpy values at the four key points ofthe cycle. (iii) Calculate the specific heat provided to the boiler, the specificwork extracted from the power station and the mass flow rate ofthe steam circulating in the cycle, then, determine the thermal efficiency of the cycle.A medium size power station is used to produce 30 MW net power for a refinery. The station uses steam as the operating fluid and operates according to the Carnot cycle between the pressure limits of 0.4 bar and 35 bar. Steam enters the boiler as a saturated liquid and leaves it as a dry saturated vapour.(i) List the name of the four processes in a generic Carnot cycle and state what type of energy transfer (work/heat) can be neglected in each process. ii) Sketch a T-s diagram for the above cycle indicating the location of the four components required. (iii) Determine the dryness fraction of the steam that is fed to the condenser. (iv) Determine the specific enthalpy values at the four key points of the cycle. (v) Calculate the specific heat provided to the boiler, the specific work extracted from the power station and the mass flow rate of the steam circulating in the cycle (vi) Determine the thermal efficiency of the cycle. (vii) Using the highest and lowest temperature values in the…
- Problem 1 In a Rankine Thermodynamic cycle, steam leaves the boiler and enters the turbine at 600 psia, 800 °F. The condenser pressure is 1 psia. After presenting a schematic of the problem in addition to clearly labeled and explained T-s and h-s diagrams, you are asked to determine the following: (a) Pump work required per Ibm of working fluid. Quality of fluid at turbine inlet. Work output of turbine per lbm of working fluid. Energy input to the boiler per lbm of working fluid. Heat rejection by the condenser per Ibm of working fluid. Determine the cycle thermal efficiency. (d) (e) (f)A set of data for a steam power plant operates with a Rankine cycle is obtained as the following: Boiler pressure Steam temperature 11 MPa 430°C High pressure turbine exhaust pressure Reheat temperature 1.5 MPa 400°C Condenser pressure 0.007 MPa Isentropic efficiency of high pressure turbine 85% Isentropic efficiency of low pressure turbine 87% a. Sketch and label the process cycle on the T- s diagram. b. Assume the work done on the boiler feed-water pump is not neglected, determine the following: i. Total heat supplied. ii. Total work output from both turbines. iii. Thermal efficiency. iv. Specific steam consumption.A power plant using a Rankine power generation cycle and steam operates at a temperature of 81.25°C in the condenser, a pressure of 5 MPa in the boiler and a maximum boiler temp of 775°C. The cycle operates at steady state with a mass flow rate of 2.5kg/s. Use the steam tables in the appendix of Sandler (p. 917 to 925). a.) Draw out the cycle, calculate the work required for the pump, the work output by the turbine, the heat into the boiler, and the heat out of the condenser. b.) What is the efficiency of this power plant? c.) If the turbine was only 89% efficient but still adiabatic (only generates 89% of the calculated work from part b), what is the overall efficiency of the cycle?