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Q2. SO parts A reversed reversible heat engine extracts heat 01-22 from a cold reservoir at temperature Told = 270K to supply heat to a rigid pressure vessel filled with a system of wet steam of mass m=10kg. The arrangement is depicted in Fig. Q2, where heat supplied by the reversed engine causes the pressure of the system to rise from p₁ = 2 bar at state point 1 to p₂ = 10 bar at state point 2. Subsequently, the reversed engine is reversed, and heat is extracted from the steam to produce work W2-1, which returns the system back to state point 1, i.e., the system undergoes a cycle. Information recorded at the state points depicted in the figure is as follows: State point 1: dryness fraction x₁ = 0.1 and pressure p₁ = 2 bar. State point 2: p₂ = 10 bar. Assume that the only transfers of heat to take place are those labelled in Fig. Q2, i.e., 01-2, Qoold, Phot and Additionally, assume that the role of the rigid pressure vessel is solely limited to containment, so that any changes to its temperature can be reasonably neglected. The shaft work supplied to the reversed engine during process 1 to 2 is W1-2 = 3000 kJ. (a) Determine the specific internal energy u, and specific volume v₁ of the system of steam at state point 1. (b) Determine the specific internal energy u₂ and dryness fraction ✗2 of the system of steam at state point 2. " (c) Determine the coefficient of performance of the reversed heat engine and hence determine the temperature of a hot reservoir that could reasonably replace the system of steam. (d) Determine the thermal efficiency of the heat engine. H₂O P₁ = 2bar x₁ = 0.1 Reversed heat engine H₂O Rigid pressure vessel containing H2O P2 = 10bar 02-1 W1-2 W2-1 Heat Engine Tcold=270K (a) At state point one heat supply is started. Tcold = 270K (b) At state point two heat extraction is started. Figure Q2. Reversible heat engine used for heating and work (i.e., Qhot and W2-1).

Q2. SO parts A reversed reversible heat engine extracts heat 01-22 from a cold reservoir at temperature Told = 270K to supply heat to a rigid pressure vessel filled with a system of wet steam of mass m=10kg. The arrangement is depicted in Fig. Q2, where heat supplied by the reversed engine causes the pressure of the system to rise from p₁ = 2 bar at state point 1 to p₂ = 10 bar at state point 2. Subsequently, the reversed engine is reversed, and heat is extracted from the steam to produce work W2-1, which returns the system back to state point 1, i.e., the system undergoes a cycle. Information recorded at the state points depicted in the figure is as follows: State point 1: dryness fraction x₁ = 0.1 and pressure p₁ = 2 bar. State point 2: p₂ = 10 bar. Assume that the only transfers of heat to take place are those labelled in Fig. Q2, i.e., 01-2, Qoold, Phot and Additionally, assume that the role of the rigid pressure vessel is solely limited to containment, so that any changes to its temperature can be reasonably neglected. The shaft work supplied to the reversed engine during process 1 to 2 is W1-2 = 3000 kJ. (a) Determine the specific internal energy u, and specific volume v₁ of the system of steam at state point 1. (b) Determine the specific internal energy u₂ and dryness fraction ✗2 of the system of steam at state point 2. " (c) Determine the coefficient of performance of the reversed heat engine and hence determine the temperature of a hot reservoir that could reasonably replace the system of steam. (d) Determine the thermal efficiency of the heat engine. H₂O P₁ = 2bar x₁ = 0.1 Reversed heat engine H₂O Rigid pressure vessel containing H2O P2 = 10bar 02-1 W1-2 W2-1 Heat Engine Tcold=270K (a) At state point one heat supply is started. Tcold = 270K (b) At state point two heat extraction is started. Figure Q2. Reversible heat engine used for heating and work (i.e., Qhot and W2-1).

Elements Of Electromagnetics
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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Q2. solve all parts A reversed reversible heat engine extracts heat Q1-22 from a cold reservoir at temperature Tcold = 270K to supply heat to a rigid pressure vessel filled with a system of wet steam of mass m=10kg. The arrangement is depicted in Fig. Q2, where heat supplied by the reversed engine causes the pressure of the system to rise from p₁ = 2 bar at state point 1 to p₂ = 10 bar at state point 2. Subsequently, the reversed engine is reversed, and heat is extracted from the steam to produce work W2-1, which returns the system back to state point 1, i.e., the system undergoes a cycle. Information recorded at the state points depicted in the figure is as follows: State point 1: dryness fraction ✗₁ = 0.1 and pressure p₁ = 2 bar. State point 2: P₂ = 10 bar. 2-1 Assume that the only transfers of heat to take place are those labelled in Fig. Q2, i.e., 02, 0, and Additionally, assume that the role of the rigid pressure vessel is solely limited to containment, so that any changes to its temperature can be reasonably neglected. The shaft work supplied to the reversed engine during process 1 to 2 is W1-2 = 3000 kJ. (a) Determine the specific internal energy u, and specific volume v₁ of the system of steam at state point 1. (b) Determine the specific internal energy u₂ and dryness fraction ✗2 of the system of steam at state point 2. (c) Determine the coefficient of performance of the reversed heat engine and hence determine the temperature of a hot reservoir that could reasonably replace the system of steam. (d) Determine the thermal efficiency of the heat engine. H₂O P₁ = 2bar x₁ = 0.1 H₂O Rigid pressure vessel containing H₂O P2 = 10bar 01-2 Reversed heat engine Q1-2 Tcold = 270K W1-2 2-1 Qhot W2-1 Heat Engine (a) At state point one heat supply is started. 2-1 Qcold Tcold = 270K (b) At state point two heat extraction is started. Figure Q2. Reversible heat engine used for heating and work (i.e., Q10 and W2-1).
Transcribed Image Text:Q2. solve all parts A reversed reversible heat engine extracts heat Q1-22 from a cold reservoir at temperature Tcold = 270K to supply heat to a rigid pressure vessel filled with a system of wet steam of mass m=10kg. The arrangement is depicted in Fig. Q2, where heat supplied by the reversed engine causes the pressure of the system to rise from p₁ = 2 bar at state point 1 to p₂ = 10 bar at state point 2. Subsequently, the reversed engine is reversed, and heat is extracted from the steam to produce work W2-1, which returns the system back to state point 1, i.e., the system undergoes a cycle. Information recorded at the state points depicted in the figure is as follows: State point 1: dryness fraction ✗₁ = 0.1 and pressure p₁ = 2 bar. State point 2: P₂ = 10 bar. 2-1 Assume that the only transfers of heat to take place are those labelled in Fig. Q2, i.e., 02, 0, and Additionally, assume that the role of the rigid pressure vessel is solely limited to containment, so that any changes to its temperature can be reasonably neglected. The shaft work supplied to the reversed engine during process 1 to 2 is W1-2 = 3000 kJ. (a) Determine the specific internal energy u, and specific volume v₁ of the system of steam at state point 1. (b) Determine the specific internal energy u₂ and dryness fraction ✗2 of the system of steam at state point 2. (c) Determine the coefficient of performance of the reversed heat engine and hence determine the temperature of a hot reservoir that could reasonably replace the system of steam. (d) Determine the thermal efficiency of the heat engine. H₂O P₁ = 2bar x₁ = 0.1 H₂O Rigid pressure vessel containing H₂O P2 = 10bar 01-2 Reversed heat engine Q1-2 Tcold = 270K W1-2 2-1 Qhot W2-1 Heat Engine (a) At state point one heat supply is started. 2-1 Qcold Tcold = 270K (b) At state point two heat extraction is started. Figure Q2. Reversible heat engine used for heating and work (i.e., Q10 and W2-1).
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