In a steam power plant based on Rankine cycle, steam is initially expanded in a high-pressure turbine. The steam is then reheated in a reheater and finally expanded in a low-pressure turbine. The expansion work in the high-pressure turbine is 400 kJ/kg and in the low-pressure turbine is 850 kJ/kg, whereas the pump work is 15 kJ/kg. If the cycle efficiency is 32%, the heat rejected in the condenser is off to 2 decimal places). kJ/kg (round

In a steam power plant based on Rankine cycle, steam is initially expanded in a high-pressure turbine. The steam is then reheated in a reheater and finally expanded in a low-pressure turbine. The expansion work in the high-pressure turbine is 400 kJ/kg and in the low-pressure turbine is 850 kJ/kg, whereas the pump work is 15 kJ/kg. If the cycle efficiency is 32%, the heat rejected in the condenser is off to 2 decimal places). kJ/kg (round

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

A simple Rankine cycle with ideal components except the turbine is shown. Boiler exit temperature and pressure are 440°C and 4 MPa, respectively. Condenser pressure is 30 kPa. The isentropic efficiency of the turbine is 95% and the power generated by the turbine is 7 MW. Calculate the mass flow rate of the steam in kg/s. Boiler Turbine 3 QB Wp Condenser а. 3.7 O b. 4.8 C. 6.3 d. 7.5 e. 9.5 f. 10.2 g. 11.3
In a Rankine cycle, steam enters the turbine at 2.5 MPa and condenser at 50 kPa, what is the thermal efficiency of the cycle?
In a reheat cycle steam at 15 MPa, 540 ̊C enters the engine and expands to 1.95 MPa.At this point the steam is withdrawn and passed through a reheater. It reenters the engineat 540 ̊C. Expansion now occurs to the condenser pressure of 0.0035 MPa (a) For theideal cycle, find e. (b) A 60,000 kw turbine operates between the same state piontsexcept that the steam enters the reheater at 1.95 MPa and 260 ̊C, departs at 1.8 MPa and540 ̊C. the steam flow is 147,000 kg/hr, generator efficiency is 96%. For actual enginefind ek, mk, and nk.
Steam enters the turbine at 10 MN/m2and 450oC. The steam expanded in the turbine down to the condenser pressure of 20 kN/m2. The condensate leaving the condenser is pumped to the boiler pressure directly. The turbine has an isentropic efficiency of 89%, and the mass of steam generated in the boiler is 5 kg/s. Find: Cycle thermal efficiency. Plant power output.Neglect the pump work and draw the cycle on a T – s diagram. Hint: 1 MN/m2= 10 bar
A power plant operating in a Reheat Rankine Cycle produces steam at 3 MPa, 600oC in the boiler. It keeps the condenser at 45oC by transfer of 10 MW out as heat transfer. The first turbine section (high-pressure) expands to 500 kPa and then flow is reheated followed by the expansion in the low-pressure turbine. Provide a detailed solution. Avoid shortcuts. Solve for the High-Pressure and Low-Pressure Turbines work output (kJ/kg)
3. A simple ideal Rankine cycle which uses water as the working fluid operates its condenser at 40 °C and its boiler at 300 °C. Calculate the work produced by the turbine, the heat supplied in the boiler, and the thermal efficiency of this cycle when the steam enters the turbine without any superheating. Wpump.in Pump 0-1 9in Boiler 13 qout Turbine Condenser Wturb,out 4
Q.3 A. Calculate the thermal efficiency of a Rankine cycle in which the steam is initially dry saturated at 2 Mpa and the condenser pressure 75 kN/m?. Express this efficiency as a percentage of a Carnot cycle efficiency of the same limits of temperature. B. If the steam leaves the boiler at 350°C with the same pressure of the boiler and condenser given above. Explain why the Rankine efficiency in (A) is less than in (B), and why the ratio of efficiencies of the respective Rankine and Carnot is greater.
A power plant operating in a Reheat Rankine Cycle produces steam at 3 MPa, 600oC in the boiler. It keeps the condenser at 45oC by transfer of 10 MW out as heat transfer. The first turbine section (high-pressure) expands to 500 kPa and then flow is reheated followed by the expansion in the low-pressure turbine. Provide a detailed solution. Avoid shortcuts. Determine the mass flow rate (kg/s)
An ideal RANKINE cycle delivers 210 MW of power. Steam enters the turbine at 10 MPa and500C and is cooled in a condenser at 10 kPaa. Determine the thermal efficiency of this cycleb. Mass flow of waterc. Heat rejected in the condenserd. Work inputted to the pump (remember the volume is constant)
In a reheat cycle steam at 15 Mpa, 540°C enters the engine and expands to 1.95 Mpa. At this point the steam is withdrawn and passed through a reheater. It reenters the engine at 540°C. Expansion now occurs to the condenser pressure of 0.0035 Mpa. (a) For the ideal cycle, find ee (b) A 60,000 kW turbine operates between the same state points except that the steam enters the reheater at 1.95Mpa and 260°C, departs at 1.8 Mpa and 540°C. The steam flow is 147,000 kg/hr; generator efficiency is 96%. For actual engine, ek, mk, and nk, (c) Determine the approximate enthalpy of the exhaust steam if the heat lost through the turbine casing is 2% of the combined work.4. Steam at 200 bar, 760°C enters the thrott
Superheated steam generated in a power plant at a pressure of 8,600 kPa anda temperature of 500 ℃ is fed to a turbine. Exhaust from the turbine enters acondenser at 15 kPa, where it is condensed to saturated liquid, which is thenpumped to the boiler.(a) What is the thermal efficiency of a Rankine cycle operating at theseconditions?(b) What is the thermal efficiency of a practical cycle operating at theseconditions if the turbine efficiency and pump efficiency are both 75%?Which of the two efficiencies has greater impact on the thermal efficiency?(c) Sketch both cycles in the same T-s diagram.(d)If the power output of the turbine is 80,000 kW in case (b), calculate themass flow rate of the working fluid.(e) Calculate the heat transfer rates in the boiler and the condenser. Doublecheck the result for the condenser.(f) For both cases (a) and (b), make a comment about the operation of turbine(issue of cavitation). [one sentence is fine](g) How you would operate the condenser of a practical…
A Rankine cycle given in the figure operates between 4 MPa and 10 kPa pressures.The adiabatic efficiency of the turbines is 85%. Water vapor at 400 kPa pressure in intermediate heatingIt is known that it is reheated to temperature and the maximum temperature of the cycle is 600oC.a) If the cooling water used in the condenser is warming up to 10oC and the water vapor isIf the flow rate is 10 kg / s, calculate the mass flow rate of the cooling water.b) Calculate the turbine work obtained from the cycle per unit mass.(Use the numberings (1-6) given at the equipment input and output in the calculations.)