A gas turbine uses two compression and two expansion stages, each stage having a pressure ratio of 4.The working fluid is intercooled between the two compression stages and reheated between the twoexpansion stages. Air enters the gas turbine at 100kPa and 17°C. The combustion chamber and reheatstage each contribute 300kJ/kg of heat. A regenerator uses exhausted gases to increase the workingfluid temperature prior to the combustion chamber by 20°C.Assume constant thermal properties of air evaluated at 300K during your solution. Assume all turbineand compressor stages are isentropic.Draw the T-s diagram based on the numbering convention in the schematic below.Determine the system's thermal efficiency.Determine the required air mass flow rate to obtain an output of 10MW.26 REMEWSREHEATJNTER.TiC2ComeREGEN.Scannad wim Camirwner

Given data, Pressure ratio-4 Air enters the turbine at 100KPa and at a temperature 17° degree We…

Answered: A gas turbine uses two compression and…

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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An ideal Otto cycle has a compression ratio of 8. At the beginning of the compression process, air is at 95 kPa and 27°C, and 800 kJ/kg of heat is transferred to air during the constant-volume heat-addition process. Take into account the variation of specific heats with temperature. The gas constant of air is R = 0.287 kJ/kg-K. Determine the mean effective pressure for the cycle. The mean effective pressure for the cycle is 0 kPa.
A steam power plant operates on an ideal reheat Rankine cycle between the pressure limits of 14 MPa and 10 kPa. The mass flow rate of steam through the cycle is 10 kg/s. Steam enters both stages of the turbine at 500°C. If the moisture content of the steam at the exit of the low-pressure turbine is not to exceed 12 percent, determine (a) the pressure at which reheating takes place, (b) the total rate of heat input in the boiler, and (c) the thermal efficiency of the cycle. Also, show the cycle on a T-s diagram with respect to saturation lines.
P
R134a is used as a working fluid in a cooling system with a cooling capacity of 50 kJ/s operating according to the ideal vapor compression refrigeration cycle. The refrigerant enters the compressor as saturated steam at a pressure of 120 kPa and is compressed to a pressure of 650 kPa. The mass flow of R-134a is 0.10 kg/s. If an isentropic turbine is used instead of the throttle valve in the cooling system, what is the efficiency coefficient of the system? A-3,689B-3.215C-4.513D-3.245E-4.123 (Note: This question is Turkish) orginal question: İdeal buhar sıkıştırmalı soğutma çevrimine göre çalışan soğutma kapasitesi 50 kJ/s olan bir soğutma sisteminde iş akışkanı olarak R134a kullanılmaktadır. Soğutucu akışkan kompresöre 120 kPa basınçta doymuş buhar olarak girmekte ve 650 kPa basınca sıkıştırılmaktadır. R-134a’nın kütlesi debisi 0.10 kg/s’dir. Eğer soğutma sistemindeki kısılma vanası yerine izantropik bir türbin kullanılırsa sistemin etkinlik katsayısı ne olur?
Answer the question.
A gas refrigeration system utilizing air as the working fluid possesses a pressure ratio of 3. The air is directed into the compressor at 5°C. The high- pressure air is then cooled down to 40°C by rejecting heat to the ambient environment. The refrigerant exits the turbine at -85°C and subsequently absorbs heat from the cooling area prior to its entry into the regenerator. The mass flow rate of air is 0.45 kg/s. Given that the isentropic efficiencies are 82 percent for the compressor and 87 percent for the turbine, and using constant specific heats at ambient temperature, find: (a) The effectiveness of the regenerator. (b) The rate at which heat is extracted from the cooling area. (c) The Coefficient of Performance (COP) of the cycle.

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