Ammonia in a piston-cylinder assembly undergoes two processes in series. Initially, the ammonia is saturated vapour at P₁=1000 kPa. Process 1-2 involves cooling until the piston meets the stops where the position is locked in place at which time quality is x2=75%. The second process from state 2 to state 3, involves heating (at constant volume) until x3=100%. If the mass is 0.45 kg determine: a) The work for process 1-2 (in kJ). b) The heat transfer for process 1-2 (in kJ). c) The work for process 2-3 (in kJ).

Ammonia in a piston-cylinder assembly undergoes two processes in series. Initially, the ammonia is saturated vapour at P₁=1000 kPa. Process 1-2 involves cooling until the piston meets the stops where the position is locked in place at which time quality is x2=75%. The second process from state 2 to state 3, involves heating (at constant volume) until x3=100%. If the mass is 0.45 kg determine: a) The work for process 1-2 (in kJ). b) The heat transfer for process 1-2 (in kJ). c) The work for process 2-3 (in kJ).

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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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

Ammonia in a piston-cylinder assembly undergoes two processes in series. Initially, the ammonia
is saturated vapour at P₁=1000 kPa. Process 1-2 involves cooling until the piston meets the stops
where the position is locked in place at which time quality is x2=75%. The second process from
state 2 to state 3, involves heating (at constant volume) until x3=100%. If the mass is 0.45 kg
determine:
a) The work for process 1-2 (in kJ).
b) The heat transfer for process 1-2 (in kJ).
c) The work for process 2-3 (in kJ).

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