A piston/cylinder apparatus initially contains 0.4 kg of saturatcd water vapor at a pressure of 200 kPa. The water vapor is now heated until the (extensive) volume of the H,0 is 0.5 m' (state 2). (a) Fill in the following table. H,0 State Temp. T(C) P (kPa) Specific volume Volume Specific internal energy u (kJ/kg) 2529.1 Pressure P, = 200 kPa V (m) Sat. vapor v (m³/kg) 1 200 0.5 state 1. (b) Determine the total work done by the H20 during the process, 1->2. (c) Determine the total heat transfer to the H;O during the process, 1>2.

A piston/cylinder apparatus initially contains 0.4 kg of saturatcd water vapor at a pressure of 200 kPa. The water vapor is now heated until the (extensive) volume of the H,0 is 0.5 m' (state 2). (a) Fill in the following table. H,0 State Temp. T(C) P (kPa) Specific volume Volume Specific internal energy u (kJ/kg) 2529.1 Pressure P, = 200 kPa V (m) Sat. vapor v (m³/kg) 1 200 0.5 state 1. (b) Determine the total work done by the H20 during the process, 1->2. (c) Determine the total heat transfer to the H;O during the process, 1>2.

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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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

A piston/cylinder apparatus initially contains 0.4 kg of saturated water vapor at a
pressure of 200 kPa. The water vapor is now heated until the (extensive) volume
of the H,0 is 0.5 m³ (state 2).
(a) Fill in the following table.
H,0
State Temp.
T(C) P (kPa)
Specific
volume
Volume
Specific
internal energy
u (kJ/kg)
2529.1
Pressure
P,
= 200 kPa
V (m?)
Sat. vapor
v (m³/kg)
1
200
0.5
state 1.
(b) Determine the total work done by the H20 during the process, 1→2.
(c) Determine the total heat transfer to the H,0 during the process, 1→2.
(d) Draw the process on a P-v diagram. Label both states.
(e) EXTRA CREDIT: Determine the change in enthalpy of the H20 from 1>2 and explain why this
answer makes sense.

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