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Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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Subject: thermodynamics
In a gas turbine generating set, two stages of compression are used with an intercooler between stages. The HP turbine drives the HP compressor, and the LP turbine drives the LP compressor and the generator. The exhaust from the LP turbine passes through a heat exchanger which transfers heat to the air leaving the HP compressor. There is a reheat combustion chamber between turbine stages which raises the gas temperature to 600 ?C, which is also the gas temperature at entry to the HP turbine. The overall pressure ratio is 10/1, each compressor having the same pressure ratio, and the air temperature at entry to the unit is 20 ?C. The heat exchanger thermal ratio may be taken as 0.7, and intercooling is complete between compressor stages. Assume isentropic efficiencies of 0.8 for both compressor stages, and 0.85 for both turbine stages, and that 2% of the work of each turbine is used in overcoming friction. Neglecting all losses in pressure, and assuming that velocity changes are negligibly small,
calculate: (i) The power output in kilowatts for a mass flow of 115 kg/s;
(ii) The overall cycle efficiency of the plant.
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- Thermodynamics 2arrow_forwardB-Correct the wrong sentence: 1. Adiabatic compression is the most desirable process to get minimum work in the compressor. 2. The thermal efficiency of constant pressure cycle is depends on the compression ratio 3. The most important fuel elements are carbon and ash. 4. The pressure of a mixture of gases is equal to the sum of partial masses of the constituents. 5. The Rankine cycle is the most efficient cyclearrow_forwardWater is the working fluid in a vapor power plant. Steam enters the turbine at 4 MPa, 540 °C, and exits the turbine as a two-phase, liquid vapor mixture at 27 °C. The condensate exits the condenser at 25 °C. The turbine efficiency is 90% and the pump efficiency is 80%. The power developed is 1 MW. ▾ ▼ Part A Determine the steam quality at the turbine exit. Express your answer to four significant figures. x = Submit Part B m = Determine the mass flow rate. Express your answer to two decimal places. Submit VAZ Ivec h A Part C Request Answer | ΑΣΦ | | vec S Request Answer Determine the thermal efficiency, Express your answer to four significant figures. 1971 ΑΣΦ | | | vec ← O C pw! 229 ? ? ? kg/sarrow_forward
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