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(Solved): Water contained in a piston-cylinder assembly undergoes two processes in series from an initial sta ...


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Water contained in a piston-cylinder assembly undergoes two processes in series from an initial state where the pressure is 10 bar and the temperature is . Process 1-2: The water is cooled as it is compressed at a constant pressure of 10 bar to the saturated vapor state. Process 2-3: The water is cooled at constant volume to . (a) Sketch both processes on and diagrams. (b) For the overall process determine the work. (c) For the overall process determine the heat transfer.


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Solution.

Known: The two process

Initial condition:   
  

Assumptions:

1) Weight of the pistons is negligible.
2) Equilibrium condition.

Analysis:

Ans a) Let us determine the three stated of the process:




State 1 :

  
  

From table   ,    Thus state 1 is superheated vapour. Readind table    at    and   .

     




State 2:

Using table    for saturated vapour at   

     






Let us determine the three stated of the process:


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