- Processes (Ideal Gas) A steady flow compressor handles 113.3 m 3 /min of nitrogen (M = 28; k = 1.399) measured at intake where P1= 97 KPa and T1= 27 C. Discharge is at 311 KPa. The changes in KE and PE are negligible. For each of the following.
- The following two statements of the second law of thermodynamics are based on the definitions of the heat engines and heat pumps. Kelvin-Planck statement of the second law It is impossible for any device that operates on a cycle to receive heat from a single reservoir and produce a net amount of work.
1. 3000 J of heat is added to a system and 2500 J of work is done by the system. What is the change in internal energy of the system?
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Known :
Heat (Q) = +3000 Joule
Work (W) = +2500 Joule
Wanted: the change in internal energy of the system
Solution :
The equation of the first law of thermodynamics
ΔU = Q-W
The sign conventions :
Q is positive if the heat added to the system
W is positive if work is done by the system
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Q is negative if heat leaves the system
W is negative if work is done on the system
The change in internal energy of the system :
ΔU = 3000-2500
ΔU = 500 Joule
Internal energy increases by 500 Joule.
2. 2000 J of heat is added to a system and 2500 J of work is done on the system. What is the change in internal energy of the system?
Known :
Heat (Q) = +2000 Joule
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Work (W) = -2500 Joule
Wanted: The change in internal energy of the system
Solution :
ΔU = Q-W
ΔU = 2000-(-2500)
ΔU = 2000+2500
Patch fr sims 3 complete edition. ΔU = 4500 Joule
Internal energy increases by 4500 Joule.
3. 2000 J of heat leaves the system and 2500 J of work is done on the system. What is the change in internal energy of the system?
Known :
Heat (Q) = -2000 Joule
Work (W) = -3000 Joule
Wanted: The change in internal energy of the system
Solution :
ΔU = Q-W
ΔU = -2000-(-3000)
ΔU = -2000+3000
ΔU = 1000 Joule
Internal energy increases by 4500 Joule.
Conclusion :
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– If heat is added to the system, then the internal energy of the system increases
– If heat leaves the system, then the internal energy of the system decreases
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– If the work is done by the system, then the internal energy of the system decreases
– If the work is done on the system, then the internal energy of the system increases