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Air is compressed steadily by a 5-kW compressor from 100 kPa and 17°C to 600 kPa and 167°C at a rate of 1.6 kg/min. During this process, some heat transfer takes place between the compressor and the surrounding medium at 17°C. Determine the rate of entropy change of air during this process.

 

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Tauseef Shaikh
Tauseef ShaikhLv10
27 Mar 2021

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

When air is compressed its temperature increases. The compression process can be done in multiple stages with cooling between thestages. This reduces the amount of work required in the compression process.

The two stage compressor shown in the figure below takes in air at room condition(300 K and 100 kPa) and compresses it to 2 MPa. The cooler then cools the air to 340 K, after which it enters the second stage, which has an exit pressure of 15MPa.

Both compression stages are adiabatic and reversble.

(a) Find the specific heat transfer in the intercooler( the amount of heat in kJ/kg that must be removed from the air).

(b) Determine the total specific work.

(c) Compare this to the work required with no intercooler.

A mass of 1.5 kg of air at 120 kPa and 24°C is contained in a gas-tight, frictionless piston–cylinder device. The air is now compressed to a final pressure of 600 kPa. During the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. Calculate the work input during this process.

 

 

A mass of 1.5 kg of air at 120 kPa and 24°C is contained in a gas-tight, frictionless piston-cylinder device. The air is now compressed to a final pressure of 600 kPa. During the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. Calculate the work input during this process.

 

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