3. In a gas turbine plant air is compressed from 1.01 bar and 15 °C through a pressure ratioof 5. It is then heated in a combustion chamber at constant pressure to a temperature of700 °C and expanded to atmospheric pressure in a turbine. The isentropic efficiencies ofcompression and expansion are respectively 0.8 and 0.85. Calculate (a) the cycleefficiency and (b) the work ratio. Assume that the properties of air do not change withtemperature and may be taken as Cp = 1.005 kJ/kg K and y = 1.4.

Answered: Image /qna-images/answer/c9f2f652-b5e7-4e43-9593-d3b78eeb133d.jpg

Answered: 3. In a gas turbine plant air is…

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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A- For the cycle shown in the (P-V) diagram, a 0.1 kg of air is suffered from three process. Find the net work output, the net heat transfer, and the net entropy change if the air is contained in a piston-cylinder arrangement. P (kPa) 800 100 0.08 T=const. V (m
A power cycle operates between two thermal reservoirs at 300 K and 800 K. The working fluid of the cycle is air, which can be considered to be an ideal gas. Specific heats are not assumed to be constant. An inventor claims that for a heat input of 250 kJ, the net work from the cycle is 80 kJ. The work generating component in the cycle is a reversible, steady state turbine. The inlet pressure and temperature are 1000 kPa and 600 K and the exit temperature is 550 K. The turbine receives 150 kJ/kg of heat from the high temperature reservoir and loses 10 kJ/kg of heat to the ambient at 298 K. (a) Prove whether or not the overall cycle is possible using second law arguments. (b) determine the work done by the turbine [kJ/kg]
QUESTION 5 The inventor claims that power cycle operates between hot and cold reservoirs at 1200 K and 400 K, respectively, with=600 kW, Q=0 kW. Calculate the rate of entropy production for this cycle in kW/K. Enter the answer without units, but with a sign if applicable. H QUESTION 6 This cycle operates O irreversibly O reversibly O impossibly.
Air enters the compressor of a Brayton refrigeration cycle at 100 kPa, 260 K, and is compressed adiabatically to 300 kPa. Air enters the turbine at 300 kPa, 300 K, and expands adiabatically to 100 kPa. For the cycle, assuming the compressor and turbine isentropic efficiencies are both 100%, determine: (a) The net work per unit mass of air flow [15 kJ/kg] (b) The coefficient of performance [2.7]
C. In an ideal gas turbine power device, the pressure ratio is 6, the temperature entering the compressor is 27°C, and the maximum allowable temperature of the turbine is 816°C. What is the efficiency of this power device when it is carried out in reversible operation? However, the specific ratio is 1.4. (a)20% (b)30% (c)40% (d)50%
A Carnot Power Cycle Operates on 2 lb of air between the limits of 70°F and 500°F . The pressure at the beginning of the isothermal expansion is 400 psia and at the end of isothermal expansion is 185 psig. Determine a.the volume at the end of the isothermal compression b.Change in entropy during the isothermal process c.heat added
(2) Describe briefly why the following statements are wrong. (a) "Hot cup of coffee becoming cold spontaneously is an entropy-decreasing process. So the law of entropy increase can be violated." (b) “Air conditioners require bulky external unit, exhausting heat to outside. With the technology constantly advancing, external unit will be eliminated in the future."
Air enters the compressor of a Brayton refrigeration cycle at 100 kPa, 260 K, and is compressed adiabatically to 300 kPa. Air enters the turbine at 300 kPa, 300 K, and expands adiabatically to 100 kPa. For the cycle, assuming the compressor and turbine isentropic efficiencies are both 100%, determine: (a) The net work per unit mass of air flow [15 kJ/kg] (b) The coefficient of performance [2.7]

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