Question

An air-standard Brayton cycle has a compressor pressure ratio of 10. Air enters the compressor at p1 = 14.7 lbf/in.2, T1 = 70°F, with a mass flow rate of 90,000 lb/h. The turbine inlet temperature is 1800°R. Calculate the thermal efficiency and the net power developed, in horsepower, if (a) the turbine and compressor isentropic efficiencies are each 100%. % hp (b) the turbine and compressor isentropic efficiencies are 88 and 84%, respectively. % hp (c) the turbine and compressor isentropic efficiencies are 88 and 84%, respectively, and a regenerator with an effectiveness of 80% is incorporated. % hp

Answer #1

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An air-standard Brayton cycle has a compressor pressure ratio of
10. Air enters the compressor at p1 = 14.7 lbf/in.2,
T1 = 70°F, with a mass flow rate of 90,000 lb/h. The turbine
inlet temperature is 1900°R. Calculate the thermal efficiency
and the net power developed, in horsepower, if
(a) the turbine and compressor isentropic efficiencies are each
100%.
Entry field with incorrect answer
47.56
%
Entry field with incorrect answer
5468.73...

4.58 Air enters a compressor operating at
steady state with a pressure of 14.7 lbf/in^2, a temperature of 808
F, and a volumetric flow rate of 18 ft /s. The air exits the
compressor at a pressure of 90 lbf/in^2 Heat transfer from the
compressor to its surroundings occurs at a rate of 9.7 Btu per lb
of air flowing. The compressor power input is 90 hp. Neglecting
kinetic and potential energy effects and modeling air as an ideal
gas,...

An open cycle gas turbine using a regenration arrangement. The
air enters the compressor at 1 bar 288 K and is compressed to 10
bar with compressor effieciency= 0.85. The air is heated in
regenerator and then enter in combustion chamber its temperature is
raised ny 1700 k and during the process the pressure falls by 0.2
bar. The air is then expanded in the turbine and passes to
regenerator which has 0.75 effectiveness and cause a pressure drop
of...

A small gas turbine has a pressure ratio of 9.5, and compressor
efficiency of 88%. Overall thermal efficiency is 37%. Ambient
conditions are 27oC, 1 bar. Air leaving the compressor passes
through a regenerator where it is heated by the exhaust gases
leaving the turbine. If the maximum temperature in the cycle is
1300oC and the exhaust gases leave the turbine at 700oC, calculate
the effectiveness of the regenerator, giving your answer to the
nearest integer percentage. Use standard aircycle...

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