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.
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.
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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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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