Part II 11. Two lbm of air initially at P₁= 15 psia and T₁ = 150 °F undergoes a cycle consisting of the following three reversible processes: a) an adiabatic compression (PVK = Constant) from state 1 to state 2 with P₂ = 45 psia, b) a constant volume process from state 2 to state 3, and c) a constant pressure process back to the initial state (state 1). Assuming constant specific heats and if kair= 1.4 and Rair= 0.3704 psia-ft'/lbm-R (0.06855 Btu/lbm-R), determine: 1) the initial air volume Ans. V₁ = ft³ 2) the temperature of the air at the end of adiabatic process 3) the total volume of the air at the end of adiabatic process Ans. T₂ = Ans. V₂ = °F ft³
Part II 11. Two lbm of air initially at P₁= 15 psia and T₁ = 150 °F undergoes a cycle consisting of the following three reversible processes: a) an adiabatic compression (PVK = Constant) from state 1 to state 2 with P₂ = 45 psia, b) a constant volume process from state 2 to state 3, and c) a constant pressure process back to the initial state (state 1). Assuming constant specific heats and if kair= 1.4 and Rair= 0.3704 psia-ft'/lbm-R (0.06855 Btu/lbm-R), determine: 1) the initial air volume Ans. V₁ = ft³ 2) the temperature of the air at the end of adiabatic process 3) the total volume of the air at the end of adiabatic process Ans. T₂ = Ans. V₂ = °F ft³
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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Two lbm of air initially at P1 = 15 psia and T1 = 150 F undergoes a cycle consisting of the following three reversible processes:
a) an adiabatic compression (PV^k = Constant) from state 1 to state 2 with P2 = 45 psia
b) a constant volume process from state 2 to state 3, and
c) a constant pressure process back to the initial state (state 1).
Assuming constant specific heats and if kair = 1.4 and Rair = 0.3704 psia-ft^3/lbm-R (0.06855 Btu/lbm-R), determine:
1) The initial air volume, V1
2) The temperature of the air at the end of adiabatic process, T2
3) The total volume of the air at the end of adiabatic process, V2
4) The temperature of the air at the end of the constant volume process
5) the entropy change during the first process, S2 - S1
6) The entropy change during the second process, S3 - S2
7) The total heat transfer during these processes, 1Q2, 2Q3, 3Q1
8) The total net work dorn during the cycle, Wnet
9) Sketch the P-V diagram for the cycle
Transcribed Image Text:Name:
Part II
11. Two lbm of air initially at P₁ - 15 psia and T₁ = 150 °F undergoes a cycle consisting of the following three
reversible processes:
a) an adiabatic compression (PVK = Constant) from state 1 to state 2 with P₂ = 45 psia,
b) a constant volume process from state 2 to state 3, and
c) a constant pressure process back to the initial state (state 1).
Assuming constant specific heats and if Kair = 1.4 and Rair = 0.3704 psia-ft³/lbm-R (0.06855 Btu/lbm-R), determine:
1) the initial air volume
Ans. V₁ =
ft³
2) the temperature of the air at the end of adiabatic process
3) the total volume of the air at the end of adiabatic process
4) the temperature of the air at the end of constant volume process
5) the entropy change during the first process
6) the entropy change during the second process
7) the total heat transfer during these processes
8) the total net work done during the cycle
9) Sketch the P-V diagram for the cycle.
Ans. T₂ =
Ans. V₂ =
Ans. T3 =
°F
ft³
°F
Ans. S₂ - S₁ =__________Btu/R
Ans. S3 - S₂ =
Ans. 1Q₂=.
Ans. 2Q3-
Ans. 3Q₁_
Ans. Wnet
Btu/R
Btu
Btu
Btu
Btu
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