A cylinder fitted with a piston and a set of stops is filled with air (Figure 7.8). The piston cross-section is 0.8 ft? and the air inside is initially at 20 psig and 800 °F. The air is then cooled at constant pressure as a result of heat transfer to the surroundings. a. what is the temperature of the air inside the cylinder when the piston reaches the stops? How much work is done during the cooling process? How much heat is rejected? b. The cooling continues after the piston reaches the stops until the temperature reaches 70 °F.. What is the pressure at this state? How much work is done during this process? How much heat is rejected?
A cylinder fitted with a piston and a set of stops is filled with air (Figure 7.8). The piston cross-section is 0.8 ft? and the air inside is initially at 20 psig and 800 °F. The air is then cooled at constant pressure as a result of heat transfer to the surroundings. a. what is the temperature of the air inside the cylinder when the piston reaches the stops? How much work is done during the cooling process? How much heat is rejected? b. The cooling continues after the piston reaches the stops until the temperature reaches 70 °F.. What is the pressure at this state? How much work is done during this process? How much heat is rejected?
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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Transcribed Image Text:First Law of Thermodynamics Conservation of Energy – Closed Systems.
1. A cylinder fitted with a piston and a set of stops is filled with air (Figure 7.8). The piston cross-section is 0.8 ft?
and the air inside is initially at 20 psig and 800 °F. The air is then cooled at constant pressure as a result of heat
transfer to the surroundings.
a. what is the temperature of the air inside the cylinder when the piston reaches the stops? How much work
is done during the cooling process? How much heat is rejected?
b. The cooling continues after the piston reaches the stops until the temperature reaches 70 °F.. What is the
pressure at this state? How much work is done during this process? How much heat is rejected?
Answer:
(a) 170.1 °F;
W=3997 ft-lbp;
Q=-13978 ft-lb; ;
(b) 29.18 psia,
Q=-11568 ft-Ib;
1 ft
Air
1 ft
Figure 7.8
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