3.70 kg / min of air as ideal gas enters a steady state
compressor that runs...
3.70 kg / min of air as ideal gas enters a steady state
compressor that runs adiabatically. Air enters P1 = 300 kPa and T1
= 440 K and exits at P2 = 500 kPa. If the isentropic efficiency of
the turbine is 0.876, what is the work, in kW?
An air compressor is operating at a steady state. The air enters
at with a volumetric flow rate 1.2 m^3/s at 170 kPa and 22 degrees
celsius with negligible velocity and leaves at 1500 kPa with
velocity of 200 m/s. The power to the compressor is 60 kW and the
compressor is cooled at a rate of 15 kJ/kg. Determine the exit
area.
Air as an ideal gas enters a diffuser operating at steady state
at 5 bar, 340 K with a velocity of 512 m/s. The exit velocity is
110 m/s.
For adiabatic operation with no internal irreversibilities,
determine the exit temperature, in K, and the exit pressure, in
bar:
(a) for k = 1.4.
(b) using data from Table A-22.
. Air enters the compressor of an ideal gas refrigeration cycle
at 7oC and 40 kPa and the turbine at 37oC and 170 kPa. The mass
flow rate of air through the cycle is 0.3 kg/sec. Assuming variable
specific heats for air, determine (a) the rate of refrigeration,
(b) the net power input, and (c) the coefficient of performance.
Also, draw the T-s diagram of the gas refrigeration cycle.
Air enters a compressor operating at steady state at 1.05 bar,
300 K, with a volumetric flow rate of 48 m3/min and
exits at 12 bar, 400 K. Heat transfer occurs at a rate of 8 kW from
the compressor to its surroundings.
Assuming the ideal gas model for air and neglecting kinetic and
potential energy effects, determine the power input, in kW.
Air enters a compressor operating at steady state with a
pressure of 14.7 lbf/in.2, a temperature of 70°F, and a volumetric
flow rate of 500 ft3/min. The air velocity in the exit pipe is 700
ft/s and the exit pressure is 133 lbf/in.2 If each unit mass of air
passing from inlet to exit undergoes a process described by pv1.34
= constant, determine (a) the exit temperature, in °F, and (b) the
diameter of the exit pipe, in inches.
Air enters the compressor of an ideal gas refrigeration cycle at
17°C and 35 kPa and the turbine at 47°C and 160 kPa. The mass flow
rate of air through the cycle is 0.3 kg/s. Assume variable specific
heats for air.
Determine the net power input.
The net power input is kW.
Air enters the compressor of an ideal air standard Brayton cycle
at 100 kPa and 290 K with a mass flow rate (m⋅)
of 6 kg/s. The compressor pressure ratio is 10. The turbine inlet
temperature is 1500 K. If a regenerator with an effectiveness of
70% is incorporated in the cycle, determine (a) the thermal
efficiency (ηth,Brayton) of the cycle. Use the
PG model for air. (b) What-if Scenario: What would
the thermal efficiency be if the regenerator effectiveness...
A regenerative gas turbine with intercooling and reheat operates
at steady state (Figure Q2). Air enters the compressor at 100 kPa,
27°C with a mass flow rate of 6 kg/s. The pressure ratio across the
two-stage compressor is 10. The pressure ratio across the two-stage
turbine is also 10. The intercooler and reheater each operate at
300 kPa. At the inlets to the turbine stages, the temperature is
1127°C. The temperature at the inlet to the second compressor stage
is...
Air enters the compressor of an ideal air-standard Brayton cycle
at 100 kPa, 300 K, with a volumetric flow rate of 5 m3/s. The
turbine inlet temperature is 1800 K. For a compressor pressure
ratio of 9, determine: (a) the percent thermal efficiency of the
cycle. (b) the back work ratio. (c) the net power developed, in
kW.
Air enters the compressor of an ideal Brayton refrigeration
cycle at 140 kPa, 270K and is compressed to 420 kPa. At the turbine
inlet, the temperature is 320K and the volumetric flow rate is 0.4
m3/s. Determine (i) the mass flow rate, in kg/s; (ii) the net power
input, in kW; (iii) the refrigerating capacity, in kW; and (iv) the
coefficient of performance.