(b) A mass of air is initially at 320°C and 100 kPa, having a volume of 0.5m³. The air is heated at constant volume to 250 kPa. An isentropic expansion process is then carried out, followed by an isothermal process which completes the cycle. (i) Sketch the cycle on P-v and T-s planes. (ii) Find the heat received and heat rejected in the cycle. (iii) Calculate the thermal efficiency of the cycle.

(b) A mass of air is initially at 320°C and 100 kPa, having a volume of 0.5m³. The air is heated at constant volume to 250 kPa. An isentropic expansion process is then carried out, followed by an isothermal process which completes the cycle. (i) Sketch the cycle on P-v and T-s planes. (ii) Find the heat received and heat rejected in the cycle. (iii) Calculate the thermal efficiency of the cycle.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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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

(b) A mass of air is initially at 320°C and 100 kPa, having a volume of 0.5m³. The air is
heated at constant volume to 250 kPa. An isentropic expansion process is then
carried out, followed by an isothermal process which completes the cycle.
(i) Sketch the cycle on P-v and T-s planes.
(ii) Find the heat received and heat rejected in the cycle.
(iii) Calculate the thermal efficiency of the cycle.

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