Question

Use cold-air-standard analysis with the fluid modeled as an ideal gas with R=0.287 kJ/kg-K and constant k=1.4. Neglect changes in kinetic and potential energy. Consider a SSSF of air at 300 K and 100 kPa entering the compressor of a Simple Brayton Cycle Gas Turbine powerplant. The cycle pressure ratio is 40 and maximum cycle temperature is 1800 K. For compressor isentropic efficiency of 82% the compressor work input per unit mass = __ kJ/kg (enter the nearest positive integer value)

Answer #1

**note:** by
mistake, I have not put a **negative** sign before
1500, so please you can put negative sigh before 1500. then the
solution becomes finally positive in results.

**I hope you can understand the solution.**

**Thank you!!!**

Consider a cold air-standard Diesel cycle. At the beginning of
compression, 102 kPa, and 300 K. The mass of air is 0.120 kg, the
compression ratio is 16, and the cut-off ratio is 2.0
For a cold air-standard analysis use the following values: cp =
1.005 kJ/kgK, cv = 0.718 kJ/kgK, k=1.40, M=28.97 kg/kmol.
Determine the following :
(a) pressure at end of compression stroke, in kPa
(b) temperature at end of compression stroke, in K
(c) maximum temperature in...

A
simple gas turbine plant working on the ideal constant pressure
cycle. Air is taken into the compressor at 1 bar, 20.2 deg C and
delivered at 7.2 bar. If the temperature at the turbine inlet is
765 deg C. Calculate the ideal thermal efficiency.

Problem 6.100 SI
Carbon dioxide (CO2) at 1 bar, 300 K enters a
compressor operating at steady state and is compressed
adiabatically to an exit state of 10 bar, 590 K. The CO2
is modeled as an ideal gas, and kinetic and potential energy
effects are negligible.
For the compressor, determine:
(a) the work input, in kJ per kg of CO2 flowing,
(b) the rate of entropy production, in kJ/K per kg of
CO2 flowing, and
(c) the percent isentropic...

1) An air-standard Otto cycle has a compression ratio of 9. At
the beginning of the compression process, the temperature is 20°C,
and the pressure is 100 kPa. The heat added is 500 kJ/kg. Determine
the cycle efficiency, work output, and the heat rejected
2) An air-standard Otto cycle operates with a minimum
temperature of 300 K and a maximum temperature of 1700 K. The
compression ratio of the cycle is 7. At the beginning of the
compression process, the...

10) An air-standard Otto cycle has a compression ratio of 9. At
the beginning of the compression process, the temperature is 20°C,
and the pressure is 100 kPa. The heat added is 500 kJ/kg. Determine
the cycle efficiency, work output, and the heat rejected.
11)An air-standard Otto cycle operates with a minimum
temperature of 300 K and a maximum temperature of 1700 K. The
compression ratio of the cycle is 7. At the beginning of the
compression process, the pressure...

2-Assuming ideal gas and constant Cp, calculate [capital delta S
with hat on top] (in kJ/(kg?K)) for a process where nitrogen is
heated from 200 K to 800 K while changing the pressure from 2000
kPa to 1000 kPa.
1-Using the thermodynamic tables, calculate [capital delta S with
hat on top] (in kJ/(kg?K)) for a process where nitrogen is heated
from 200 K to 800 K while changing the pressure from 2000 kPa to
1000 kPa.

1) A nozzle is a device for increasing the velocity of a
steadily flowing stream of fluid. At the inlet to a certain nozzle
the enthalpy of the fluid is 3025 kJ/kg and the velocity is 60 m/s.
At the exit from the nozzle the enthalpy is 2790 kJ/kg. The nozzle
is horizontal and there is negligible heat loss from
it.
(i) Find the velocity at the nozzle exit.
(ii) If the inlet area is 0.1 m2 and specific volume...

Air at 1 bar, 295 K, and a mass flow rate of 0.7 kg/s enters a
compressor operating at steady state and exits at 3 bar. During the
compressing from inlet to exit, the air experiences a polytropic
process as PV^n=constant. m=6, n=1.48.
(1) Determine the power required by the compressor.
(2) Determine the heat transfer between the compressor and the
surrounding.
(s) Determine the rate of exergy destruction. Kinetic and potential
energy effects are negligible. Let T_0 = 300...

Air at 1 bar, 295 K, and a mass flow rate of 0.7 kg/s enters a
compressor operating at steady state and exits at 3 bar. During the
compressing from inlet to exit, the air experiences a polytropic
process as PV^n=constant. m=6, n=1.48
(1) Determine the power required by the compressor.
(2) Determine the heat transfer between the compressor and the
surrounding.
(s) Determine the rate of exergy destruction. Kinetic and potential
energy effects are negligible. Let T_0 = 300...

A Diesel cycle engine is analyzed using the air standard
method. Given the conditions at state 1, compression ratio
(r), and cutoff ratio (rc) determine the efficiency and other
values listed below.
Note: The gas constant for air is R=0.287 kJ/kg-K.
--Given Values--
T1 (K) = 322
P1 (kPa) = 120
r = 11.5
rc = 1.6
Specific internal energy (kJ/kg) at state 1: 229.86
Relative specific volume at state 1= 520.52
Relative specific volume at state 2= 45.26
Temperature...

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