9. Show that the thermal efficiency of a combined gas-steam power plant nee can be expressed asnce ngns - N9I, where ng= and ns =and steam cycles, respectively. Using this relation, determine the thermal efficiency of a combinedpower cycle that consists of a topping gas-turbine cycle with an efficiency of 40 % and a bottomingsteam-turbine cycle with an efficiency of 30 %are the thermal efficiencies of the gasQinQg,out10. It can be shown that the thermal efficiency of a combined gas-steam power plant ncc can be ex-pressed in terms of the thermal efficiencies of the gas-turbine and the steam-turbine cycles asncc = ng + ns - ngns. Prove that the value of ncc is greater than either of ns or ng. That is,the combined cycle is more efficient than either of the gas-turbine or steam-turbine cycles alone-End

Answered: Image /qna-images/answer/29555ffe-68d3-4d75-8dd9-16054db19b4f.jpg

Answered: 9. Show that the thermal efficiency of…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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a) An engineer proposed a design of cyclical engine that operates at the energy source whose temperature is 550 K and a sink at 300 K that generates waste heat. In the design proposal, it has been claimed that the cyclical engine can produces 5 kW while rejecting heat at a rate of 15000 kJ/h. Evaluate if the design proposal is valid. Justify your answer with related calculation.
3. In a Carnot cycle operating on nitrogen, the heat supplied is 40 BTU and the adiabatic expansion ratio is 12.5. If the receiver temperature is 60F, determine; a. The thermal efficiency b. The work c. The heat rejected TCA
A thermal power plant operates on a regenerative cycle with a single open feed water heater, as shown in the figure. For the state points shown, the specific enthalpies are h1 =2800 kJ/kg and h2 =200 kJ/kg. The bleed to the feed water heater is 20% of the boiler steam generation rate. The specific enthalpy at state 3 is
Need help with this engineering problem.
Consider a gas turbine power plant operating on an ideal Brayton cycle having a pressure ratio of 10. For simplified standard cold air assumptions, determine the thermal efficiency, in %.
A regenerative steam cycle renders A. increased work output per unit mass of steam В. decreased work output per unit mass of steam C. increased thermal efficiency decreased work output per unit mass of steam as D. well as increased thermal efficiency
A Rankine cycle with a thermal efficiency of 42% produces 100 kW of net power. What is the rate of heat transfer into the boiler? Round your answer to the nearest whole number.
On the diagram below sketch a basic Rankine cycle with superheating. Assume that there are irrevesibilities in the turbine and pump. Identify the device associate with each process. Make sure to label: the states and include important features, e.g. lines of constant temperature, volume, pressure, entropy, vapor dome, etc.
(A) the net heat energy absorbed during a cyclic process (the difference between heat flowing into the system and heat leaving the system) is the work. If we regard the atmosphere as a heat engine, what is the work being done by the atmosphere? That is, what phenomenon or phenomena are a realization of the work being done by the atmosphere? (B) Of all possible heat engines, the Carnot cycle has the maximum efficiency between any two operating temperatures (think of these temperatures as the maximum and minimum temperatures encountered during the cycle). Estimate the Carnot efficiency of Earth's atmosphere. [Hint: Think about the temperature variation with latitude.] (C) Do you think the efficiency of the real atmosphere would be "close" or "far" from the Carnot efficiency? Please explain your answer.
For the Rankine Cycle Plant shown below, determine the mass flow rate of steam required to produce a net power output of 55 MW if the net work output is 1386 kJ/kg. Determine your answer in kg/s and present it correct to two decimal places. Feed Pump 1 Answer: 2 5 Boiler wwwwww wwwwwww Reheater Condenser LP Turbine 3 6 4 HP Turbine
A 283-MW steam power plant operates on the Rankine cycle but with turbine and pump efficiencies of 90%. The steam enters the turbine at 10,000 kPa and 550°C. It discharges to the condenser at 50 kPa. Determine the thermal efficiency in percent.

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