Q3/ A rigid, insulated tank that is initially evacuated is connected through a valve to a supply line that carries steam at 1 MPa and 300°C. Now the valve is opened, and steam is allowed to flow slowly into the tank until the pressure reaches 1 MPa, at which point the valve is closed. Determine the final temperature of the steam in the tank. Assumptions 1 This process can be analyzed as a uniform-flow process since the properties of the steam entering the control volume remain constant during the entire process. 2 The kinetic and potential energies of the streams are negligible, KE=PE= 0. 3 The tank is stationary and thus its kinetic and potential energy changes are zero; that is, AKE = APE = 0 and AEsystem =AUsystem. 4 There are no boundary, electrical, or shaft work interactions involved (W=0). 5 The tank is well insulated and thus there is no heat transfer (Q=0).

Q3/ A rigid, insulated tank that is initially evacuated is connected through a valve to a supply line that carries steam at 1 MPa and 300°C. Now the valve is opened, and steam is allowed to flow slowly into the tank until the pressure reaches 1 MPa, at which point the valve is closed. Determine the final temperature of the steam in the tank. Assumptions 1 This process can be analyzed as a uniform-flow process since the properties of the steam entering the control volume remain constant during the entire process. 2 The kinetic and potential energies of the streams are negligible, KE=PE= 0. 3 The tank is stationary and thus its kinetic and potential energy changes are zero; that is, AKE = APE = 0 and AEsystem =AUsystem. 4 There are no boundary, electrical, or shaft work interactions involved (W=0). 5 The tank is well insulated and thus there is no heat transfer (Q=0).

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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Concept explainers

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.

Question

Q3/
A rigid, insulated tank that is initially evacuated is connected through a valve to a supply line that
carries steam at 1 MPa and 300°C. Now the valve is opened, and steam is allowed to flow slowly
into the tank until the pressure reaches 1 MPa, at which point the valve is closed. Determine the
final temperature of the steam in the tank.
Assumptions
1 This process can be analyzed as a uniform-flow process since the properties of the steam entering
the control volume remain constant during the entire process.
2 The kinetic and potential energies of the streams are negligible, KE=PE= 0.
3 The tank is stationary and thus its kinetic and potential energy changes are zero; that is, AKE =
APE = 0 and AEsystem =AUsystem.
4 There are no boundary, electrical, or shaft work interactions involved (W=0).
5 The tank is well insulated and thus there is no heat transfer (Q=0).

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Refrigerant-134a at 1 MPa and 908C is to be cooled to 1 MPa and 308C in a condenser by air. The air enters at 100 kPa and 278C with a volume flow rate of 600 m3/min and leaves at 95 kPa and 608C. Determine the mass flow rate of the refrigerant. V₂ = 600 m³/min |P3= 100 kPa| T3 = 27°C R-134a P₁ = 1 MPa T₁ = 90°C ₪ | P4 = 95 kPa T₁ = 60°C P₂ = 1 MPa T₂ = 30°C