Q2: A steam power plant operates on an ideal reheat- regenerative Rankine cycle and has a net power output of 80 MW. Steam enters the high-pressure turbine at 10 MPa and 550°C and leaves at 0.8 MPa. Some steam is extracted at this pressure to heat the feedwater in a closed feedwater heater. The rest of the steam is reheated to 500°C and is expanded in the low-pressure turbine to the condenser pressure of 10 kPa. determine (a) the mass flow rate of steam through the boiler and (b) the thermal efficiency of the cycle. Turbine Boiler 1-y 10 MPa 0.8 MPa 1-y 9. Closed fwh 4. Mixing chamber Condenser 10 kPa -2 7. 10 PII PI

Q2: A steam power plant operates on an ideal reheat- regenerative Rankine cycle and has a net power output of 80 MW. Steam enters the high-pressure turbine at 10 MPa and 550°C and leaves at 0.8 MPa. Some steam is extracted at this pressure to heat the feedwater in a closed feedwater heater. The rest of the steam is reheated to 500°C and is expanded in the low-pressure turbine to the condenser pressure of 10 kPa. determine (a) the mass flow rate of steam through the boiler and (b) the thermal efficiency of the cycle. Turbine Boiler 1-y 10 MPa 0.8 MPa 1-y 9. Closed fwh 4. Mixing chamber Condenser 10 kPa -2 7. 10 PII PI

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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Question

Q2: A steam power plant operates on an ideal reheat- regenerative
Rankine cycle and has a net power output of 80 MW. Steam enters the
high-pressure turbine at 10 MPa and 550°C and leaves at 0.8 MPa. Some
steam is extracted at this pressure to heat the feedwater in a closed
feedwater heater. The rest of the steam is reheated to 500°C and is
expanded in the low-pressure turbine to the condenser pressure of 10 kPa.
determine (a) the mass flow rate of steam through the boiler and (b) the
thermal efficiency of the cycle.
Turbine
Boiler
1-y
10 MPa
7.
V 8
0.8 MPa
61
3.
1-y
9.
Mixing
chamber
4.
Closed
Condenser )
fwh
10 kPa
-2
8.
7.
10
PII
PI

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A steady-state system for producing power consist of a pump, heat exchanger and a turbine. Watersteam power plant operates on an ideal reheat– regenerative Rankine cycle. Steam enters the highpressure turbine at 10 MPa and 550°C and leaves at 0.8 MPa. Some steam is extracted at thispressure to heat the feedwater in an open feedwater heater. The rest of the steam is reheated to500°C and is expanded in the low-pressure turbine to the condenser pressure of 10 kPa. Determinethe entropy generation associated with the reheating and regeneration processes. Assume a sourcetemperature of 1800 K. Please Solve step by step.
Required information NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Consider a steam power plant that operates on a reheat Rankine cycle and has a net power output of 80 MW. Steam enters the high-pressure turbine at 10 MPa and 500°C and the low-pressure turbine at 1 MPa and 500°C. Steam leaves the condenser as a saturated liquid at a pressure of 10 kPa. The isentropic efficiency of the turbine is 72 percent and that of the pump is 95 percent. Determine the quality (or temperature, if superheated) of the steam at the turbine exit. Use steam tables. (You must provide an answer before moving on to the next part.) The temperature of the steam at the turbine exit is °C.
A steam power plant operating on a non-ideal Rankine cycle is shown in the diagram below. Heat is supplied to the boiler by a hot oil stream at 450°C. The oil has a constant specific heat of 2.7 kJ/kg.k. The mass flow rate of steam is 5 kg/s. This cycle reject heat to the ambient surroundings at 25°C. All other necessary conditions and isentropic efficiencies are given in the diagram below. Determine: (a) the power input to the pump (W pump) (b) the power output by the turbine (Wurbine). (c) The net power output from the cycle (Wnet) (d) the heat input to the boiler (QH). (e) the heat output from the condenser (QL). (f) the thermal efficiency of the cycle. (g) the mass flow rate of oil (ṁ oil). (h) The entropy generation rate in kW/K. mol = ? Toil, in= 450°C m:team = 5 kg/s P; = 20 bar P; = 20 bar T; = 400°C Boiler Teil,out = 410°C W pump W Turbine Pump -> Nisentropic = 0.7 Nisentropic = 0.6 Condenser P, =8 kPa P3 =8 kPa Ambient Environment, T= 25°C %3D
Consider an ideal steam regenerative Rankine cycle with two feedwater heaters, one closed and one open. Steam enters the turbine at 10 MPa and 500 C and exhausts to the condenser at 10 kPa. Steam is extracted from the turbine at 0.7 MPa for the closed feedwater heater and 0.3 MPa for the open one. The extracted steam leaves the closed feedwater heater and is subsequently throttled to the open feedwater heater. Show the cycle on a T-s diagram with respect to saturation lines, and using only the data presented in the data tables given below determine a) the fraction for steam leaving the boiler that is extracted at 0.3 MPa z=0.1425 b) the fraction of steam leaving the boiler that is extracted at 0.7 MPa y=0.06213 c) the heat transfer from the condenser per unit mass leaving the boiler q_out=1509 kJ/kg d) the heat transfer to the boiler per unit mass leaving the boiler qin=2677 kJ/kg e) the mass flow rate of steam through the boiler for a net power output of 250 MW m'=214.1 kg/s f) the…