Example Problems
Here are some example problems based on the material
in this lesson. I encourage you to read them,
think about them and maybe give them a try yourself. Then click on the
solution link at the end of each problem to see my solution and a good explanation.
Click on the Help Blog link to see questions and answers about each problem.
in this lesson. I encourage you to read them,
think about them and maybe give them a try yourself. Then click on the
solution link at the end of each problem to see my solution and a good explanation.
Click on the Help Blog link to see questions and answers about each problem.
7E-1 :
Isentropic Compression of Ammonia
4 pts
Saturated ammonia vapor enters an adiabatic compressor at -10°C and leaves at a pressure of 1.0 MPa. Determine the work requirement per kg of ammonia for the compressor if the process is reversible.
Click here to see the complete solution , Help Blog
Click here to see the complete solution , Help Blog
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7E-2 :
PVT Relationships for Isentropic, IG Processes
8 pts
The pressure-volume diagram of a Carnot power cycle executed by an ideal gas with constant specific heat ratio γ is shown in the diagram. Demonstrate that …
a.) V4 V2 = V1 V3
b.) T2 T3 = (P2 / P3)((γ-1)/γ)
c.) T2 T3 = (V3 / V2)γ-1
_image1_
Click here to see the complete solution , Help Blog
a.) V4 V2 = V1 V3
b.) T2 T3 = (P2 / P3)((γ-1)/γ)
c.) T2 T3 = (V3 / V2)γ-1
_image1_
Click here to see the complete solution , Help Blog
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7E-3 :
Work and ΔS for IGs Undergoing Isothermal, Polytropic and Adiabatic Processes
8 pts
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7E-4 :
Isentropic Efficiency of an Ideal Gas Compressor
7 pts
Air enters an insulated compressor operating at steady-state at 1.05 bar, 300K with a mass flow rate of 1.8 kg/s and exits at 2.9 bar. Kinetic and potential energy effects are negligible.
a.) Determine the minimum theoretical power input required, in kW, and the corresponding exit temperature, in K.
b.) If the exit temperature is 420 K, determine the power input, in kW, and the isentropic compressor efficiency.
Click here to see the complete solution , Help Blog
a.) Determine the minimum theoretical power input required, in kW, and the corresponding exit temperature, in K.
b.) If the exit temperature is 420 K, determine the power input, in kW, and the isentropic compressor efficiency.
Click here to see the complete solution , Help Blog
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7E-5 :
Power Input for an Internally Reversible, Polytropic Compressor
6 pts
Refrigerant 134a enters a compressor operating at steady-state as saturated vapor at 2 bar with a volumetric flow rate of 0.019 m3/s. The refrigerant is compressed to a pressure of 8 bar in an internally reversible process according to PV1.03= constant.
a.) the power required, in kW.
b.) the rate of heat transfer, in kW.
Click here to see the complete solution , Help Blog
a.) the power required, in kW.
b.) the rate of heat transfer, in kW.
Click here to see the complete solution , Help Blog
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- Download Data Tables
- Download Study Aids
- Homework problem hints and answers
- Get Help from Dr. B in the LT Blog
- 120 day membership
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Click here to join LTA !
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