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

Problem 1.1MA

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You are an operating engineer in a steam power plant which is working on a regenerative Rankine cycle and you are requested to find the thermal efficiency of this cycle. You read the following data from the measuring devices used in the power plant: The pressure and temperature of the steam at the inlet of the turbine are 7000kPa and 550 °C, respectively. The pressure at the inlet of the condenser is 22 kPa. The extracted steam from the turbine is at 500 kPa and it is used to heat the feed water in an open feed water heater. The pumps and turbine efficiencies are 80% and 85%, respectively. Don't forget to show the evele on a T-s diagram.
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An ideal Rankine cycle operates between the pressure limits of 15,000 kPa in the boiler and 15 kPa in the condenser. If the turbine inlet temperature is 500 deg C and the cycle produces 2500 kW of net work, determine the mass flow rate of the steam in kg/s. Refer to the tables below. a. 1.993 b. 2.122 c. 1.856 d. 2.016
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 dryness fraction of steam at state 6 to 1 decimal places.

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