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A mass of 5kg of air expands in a polytropic process with n=1.2 from 300 kPa and 1.5m3 until double its volume. The air is then compressed in a process at a constant temperature until it returns to its initial volume. Determine: a) Boundary work and heat (in kJ) during the polytropic process (process 1-2) (b) Temperatures 1 and 2 c) Boundary and heat work for constant temperature compression process (2-3 process) For air you can use: R = 0.287 kJ/kg. K Cv = 0.718 kJ/kg. K Cp = 1,005 kJ/kg

A mass of 5kg of air expands in a polytropic process with n=1.2 from 300 kPa and 1.5m3 until double its volume. The air is then compressed in a process at a constant temperature until it returns to its initial volume. Determine: a) Boundary work and heat (in kJ) during the polytropic process (process 1-2) (b) Temperatures 1 and 2 c) Boundary and heat work for constant temperature compression process (2-3 process) For air you can use: R = 0.287 kJ/kg. K Cv = 0.718 kJ/kg. K Cp = 1,005 kJ/kg

Elements Of Electromagnetics
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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A mass of 5kg of air expands in a polytropic process with n=1.2 from 300 kPa and 1.5m3
until double its volume. The air is then compressed in a process at a constant temperature until it returns to its
initial volume.
Determine:
a) Boundary work and heat (in kJ) during the polytropic process (process 1-2)
(b) Temperatures 1 and 2
c) Boundary and heat work for constant temperature compression process (2-3 process)

For air you can use:

R = 0.287 kJ/kg. K

Cv = 0.718 kJ/kg. K

Cp = 1,005 kJ/kg.K

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