Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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Air is expanded in an internally reversible process from p1=10.29 bar and T1=1200K to a final pressure of p2= 1.00 bar.
Determine all properties of the initial and final states (T,p,v,h and u), calculate the work of the process per unit mass, and sketch the process in the T-s and p-v diagrams assuming ideal gas behavior in the 4 following cases.
- Adiabatic reversible expansion in an ideal turbine (1 inlet and 1 outlet);
- Adiabatic reversible expansion in a (closed) frictionless piston–cylinder device;
- Isothermal reversible expansion in an ideal turbine (1 inlet and 1 outlet);
- Isothermal expansion in a (closed) frictionless piston–cylinder device.
Kinetic and potential energy terms are negligible in all processes
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- Use image below Part A - Evaluate the volume and internal energy of the air in the initial state 1, in the intermediate state 2, and in the final dead state DS. Also evaluate the temperature of the air in the intermediate state 2. PArt B - Plot the processes 1 → 2 → DS on P–v, T–v, P–s, and T–s diagrams. Mark states 1, 2, and DS on the graphs, and make sure that it is clear when a given quantity increases, decreases, or remains constant.arrow_forwardDraw the P-V diagram of the following mechanically reversible process of an ideal gas in a closed system and calculate the total work done. Indicate whether this work is done by the system or on the system. a. State A (2V, P) to State B (V, P) b. State B (V, P) to State C (V, 2P) c. State C (V, 2P) to State D (3V, 2P) d. State D to State A. What is the total internal energy change, enthalpy change and net heat flow (added or extracted) for the process?arrow_forwardFor each case, determine the specified property value and locate the state sketches of the p–υ and T–υ diagrams. For Refrigerant 134a at T = 160°F, h = 127.7 Btu/lb. Find υ, in ft3/lb. For Refrigerant 134a at T = 90°F, u = 72.71 Btu/lb. Find h, in Btu/lb. For ammonia at T = 160°F, p = 60 lbf/in.2 Find u, in Btu/lb. For ammonia at T = 0°F, p = 35 lbf/in.2 Find u, in Btu/lb. For Refrigerant 22 at p = 350 lbf/in.2, T = 350°F. Find u, in Btu/lb.arrow_forward
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