Steam is the working fluid in a Rankine cycle as shown in Fig. Q1 with superheat and reheat. Steam enters the first-stage turbine at 8.0 MPa (80 bar), 480 °C, and expands to 0.7 MPa (7 bar). It is then reheated to 440 °C before entering the second-stage turbine, where it expands to the condenser pressure of 0.008 MPa. Each turbine stage has the same isentropic efficiency of 85%. If the net power output is 100 MW:

Steam is the working fluid in a Rankine cycle as shown in Fig. Q1 with superheat and reheat. Steam enters the first-stage turbine at 8.0 MPa (80 bar), 480 °C, and expands to 0.7 MPa (7 bar). It is then reheated to 440 °C before entering the second-stage turbine, where it expands to the condenser pressure of 0.008 MPa. Each turbine stage has the same isentropic efficiency of 85%. If the net power output is 100 MW:

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

See similar textbooks

Similar questions

Q2. An ideal Otto cycle with air as the working fluid has a compression ratio of 10. The minimum and maximum temperatures in the cycle are 300 and 1340 K respectively. Accounting for the variation of specific heats with temperature, sketch P-V diagram of the cycle and determine: a) The amount of heat transferred to the air during the heat addition process b) The net work output (kJ/kg) ANSWER
For the Rankine cycle shown below, Determine the power output from the turbine? Steam 140 bar, 350 °C Turbine 00 Boiler Condenser Water pump W₁ =? Steam 0.035 bar AT Cooling water 5.5 K mcooling water = 50 kg/s
Consider a steam power plant that operates on the ideal reheat Rankine cycle as shown in Fig. Q5. The plant maintains the boiler at 7000 kPa, the reheat section at 800 kPa, and the condenser at 10 kPa. The mixture quality at the exit of both turbines is 93 percent. Determine the temperature at the inlet of each -1 turbine and the cycle's thermal efficiency. Reheater Boiler High-P turbine Pump Low-P turbine Condenser
2) A steam power plant operates according to the simple ideal Rankine cycle. The pressure limits of the cycle are 9 MPa and 10 kPa, and the flow of water eirculating in the cycle is 60 kg/s. It is required that the moisture content of the steam at the turbine outlet does not fall below 90 percent. Accordingly, calculate (a) the lowest possible turbine inlet temperature, (b) the heat supplied to the cycle, and (c) the thermal efficiency of the cycle by showing the cycle on a T-s diagram with saturated vapor and saturated liquid curves,.
High-P Low-P turbine turbine Reheater (4) Boiler P = Ps = Preheat Pump Condenser The following data was given for a steam power plant operating on the ideal reheat Rankine cycle. 3-4: Inlet steam at 17.5 MPa and 600 C 6-1: inlet steam at a pressure of 11.16 kPa at a wetness fraction of 01. At state 1, the specific volume is 0.00101 m/kg Find the specific entropy in kJ/kg at state 2 to 3 decimal places. Activate Windows
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.
High-P turbine Low-P turbine Reheater (4) Boiler P4 = P5 = Preheat Pump Condenser The following data was given for a steam power plant operating on the ideal reheat Rankine cycle. 3-4: Inlet steam at 17.5 MPa and 600 °C 6-1: inlet steam at a pressure of 11.16 kPa at a wetness fraction of 0.1. At state 1, the specific volume is 0.00101 m3/kg Find the temperature in degree C at state 4 to 2 deciamal places.
A steam plant works on the Rankine cycle with reheat. Steam enters the turbine at 35 bar, 350°C, and expands to 10 bar, where it passes through a reheater, emerging at 350°C. It then expands to the condenser pressure of 35 kPa. For an ideal cycle, compute (a) workdone in HP and LP turbines (b) heat added in the reheater (c) pump work (d) efficiency (e) heat added in the boiler
In a Rankine cycle steam enters the turbine at 2.5MPa (enthalpies and entropies given) and condenser of 50KPa (properties given), what is the thermal efficiency of the cycle? At 2.5MPa: hg = 2803.1 sg = 6.2575, At 50KPa: sf = 1.0910 sfg = 6.5029 hf = 340.49 hfg = 2305.4 vf = 0.0010300
Boiler High-P turbine LOW-P turbine Reheater 4 P₁ = P5 = Preheat P4 2 Pump Condenser 1 The following data was given for a steam power plant operating on the ideal reheat Rankine cycle. 3-4: Inlet steam at 17.5 MPa and 600 °C 6-1: inlet steam at a pressure of 11.16 kPa at a wetness fraction of 0.1. At state 1, the specific volume is 0.00101 m³/kg Find the specific entropy in kJ/kg at state 1 to 3 decimal places.
For the Rankine cycle shown below, Determine the power output from the turbine? Steam 140 bar, 350 °C Turbine 100 A Boiler Water pump Condenser W₁ =? Steam 0.035 bar AT Cooling water -5.5 K mcooling water = 50 kg/s