Question

An air compressor, operated at steady state, compresses air from 1 bar 25oC to 10 bar....

An air compressor, operated at steady state, compresses air from 1 bar 25oC to 10 bar. At the outlet of the compressor, the air temperature is 80oC. The compressor transfers heat to the surroundings at 300kJ for each kg of air passing through the compressor. The average temperature at which the heat is transferred is 50oC. Which of the following values is closest to the specific entropy production of the compressor process? For air, Cp=1.01 kJ/kgK and R=0.286kJ/kgK. Hints: Air can be treated as ideal gas.

Homework Answers

Answer #1

ANSWER

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A reciprocating compressor takes a charge of air at 1 bar and 200C and compresses it...
A reciprocating compressor takes a charge of air at 1 bar and 200C and compresses it to 5 bar. Assuming that the compression is reversible and has an index, n, of 1.3, find the final temperature and heat per unit mass that must be extracted by a cooling jacket if the compressor is to run at a steady temperature.
One mole of an ideal gas (CP/R=7/2), is compressed in a steady-flow compressor from 2.5 bar...
One mole of an ideal gas (CP/R=7/2), is compressed in a steady-flow compressor from 2.5 bar and 25°C to 6.5 bar and 120°C. The compressor rejects 0.5 kJ as heat to the surrounding at 293K. Calculate: 1.     The enthalpy change of the gas (in kJ) 2.     The entropy change of the gas (in J.mol-1) 3.     The work required for the compression (in kJ) 4.     The ideal work of the process (in kJ) 5.     The thermodynamic efficiency The lost work (in kJ)
A two-part compressor operates with steady state conditions. The exit of the first part of the...
A two-part compressor operates with steady state conditions. The exit of the first part of the compressor is also the inlet of the second part of the compressor. In the first part of the compressor, air is compressed from 1.5 bar, 350 K to 5.5 bar with a mass flow rate of 7.2 kg/sec. In the second part of the compressor, air is compressed from 5.5 bar to 9.5 bar with a mass flow rate of 5.8 kg/sec. Each unit...
An adiabatic air compressor compresses 10.6 L/s of air at 120 kPa and 20°C to 1000...
An adiabatic air compressor compresses 10.6 L/s of air at 120 kPa and 20°C to 1000 kPa and 300°C. The constant pressure specific heat of air at the average temperature of 160°C = 433 K is cP = 1.018 kJ/kg·K. The gas constant of air is R = 0.287 kPa·m3/kg·K. Determine the work required by the compressor
4.58 Air enters a compressor operating at steady state with a pressure of 14.7 lbf/in^2, a...
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,...
Two streams of air are mixed in a steady-state process. Assume air is an ideal gas...
Two streams of air are mixed in a steady-state process. Assume air is an ideal gas with a constant heat capacity Cp=7R/2. Stream A: 0.167 mol/s, 250K, 1 bar Stream B: 0.833 mol/s, 310K, 1 bar Stream C: 1 bar (A and B going to the right into tank, and C going to the right out of the tank) a) What is the temperature of the stream leaving the tank if the process is adiabatic? b) What is the rate...
In a cylinder/piston arrangement, air is compressed in a reversible polytropic process to a final state...
In a cylinder/piston arrangement, air is compressed in a reversible polytropic process to a final state of 800 kPa, 500 K. Initially air is at 110 kPa and 25oC. During the compression process heat transfer takes place with the ambient maintained at 25oC. Assume air as an ideal gas (R =0.287 kJ/kg) and has constant specific heats of Cp = 1.004 kJ/kgK and Cv = 0.717 kJ/kgK. If the mass of air in the cylinder is 0.1286 kg, determine a)...
n ideal air-standard Brayton cycle operates at steady state with compressor inlet conditions of 290 K...
n ideal air-standard Brayton cycle operates at steady state with compressor inlet conditions of 290 K and 95 kPa and a fixed turbine inlet temperature of 1650 K. For a compressor pressure ratio of 10, determine: (a) the exhaust temperature of the cycle, in K. (b) the back work ratio. (c) the net work developed per unit mass flowing, in kJ/kg. (d) the heat addition per unit mass flowing, in kJ/kg. (e) the thermal efficiency for the cycle.
Air at 1 bar, 295 K, and a mass flow rate of 0.7 kg/s enters a...
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...
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...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT