4. A cylinder contains 0.12 m³ of air at 1 atm and 90 °C. The air is compressed to a volume of 0.03 m³, The final pressure being 6 atm. Determine: a.) the value of n for the compression; b.) the increase in internal energy of air; and c.) the work done during compression.

4. A cylinder contains 0.12 m³ of air at 1 atm and 90 °C. The air is compressed to a volume of 0.03 m³, The final pressure being 6 atm. Determine: a.) the value of n for the compression; b.) the increase in internal energy of air; and c.) the work done during compression.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter2: Matter And Energy

Section: Chapter Questions

Problem 29RQ: If 3000 ft3 of air is crossing an evaporator coil and iscooled from 75F to 55F, what would be the...

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Concept explainers

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.

Question

4. A cylinder contains 0.12 m³ of air at 1 atm and 90 °C. The air is compressed to a volume of 0.03 m³, The final pressure being 6 atm. Determine: a.) the value of n for the
compression; b.) the increase in internal energy of air; and c.) the work done during compression.

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Step 1 Expression of work done in case of polytropic process.

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Step 2 Calculation of polytropic exponent.

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Step 3 Calculation of Internal Energy increase and work done.

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