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For Example, the pressure of evaporator can be changed, also the pressure of condenser and many more parameters. What is that parameter which remain constant while others keep changing ?

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    $\begingroup$ Mass flow rate? $\endgroup$
    – Solar Mike
    Sep 15, 2017 at 20:15
  • $\begingroup$ It doesn't remain constant. $\endgroup$
    – Zaid AAmir
    Sep 15, 2017 at 20:54
  • $\begingroup$ If it is true that the mass flow does not remain constant then where is the mass stored? $\endgroup$
    – Solar Mike
    Sep 15, 2017 at 21:44
  • $\begingroup$ the velocity changes, the volume flow changes as the fluid goes through phase changes but where do you think the mass is stored? $\endgroup$
    – Solar Mike
    Sep 15, 2017 at 21:46
  • $\begingroup$ I'm voting to close this as unclear. There are plenty of parameters you can hold fixed while varying others. We need to know specifically what you are talking about. Especially since the comment here mentioned what seems like the "obvious" answer here, and you said no. $\endgroup$
    – JMac
    Sep 18, 2017 at 12:31

1 Answer 1

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Depends how far you want to go with the modifications.

You can change the working parameters of the pump, changing the flow rate. While you can't meaningfully reduce the volume of the coolant in liquid phase through compressing it, through changing the flow rates you may delay the condensation - make it occur farther down the radiator - and so the volume of the liquid phase will change. You can introduce physical changes by modifying the machine: add or remove coolant, replace coolant with a different substance that has different phase change diagrams and heat properties, you may change the tubing modifying pressures and volumes, change the evaporator, replace the coolant with one that only works through compression/expansion without phase change at all, or even change the entire principle of operation - toss the whole vapor-compression refrigeration aggregate and paste a Peltier cell with a fan to the back of the cool box.

The, only thing you can't change is that you input work in order to transfer heat, or it will cease to be a refrigerating machine.

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