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Can a hydraulic compression create endothermic phenomena?

  1. Oct 7, 2014 #1
    The title might be a bit confusing but I just want to know if you can recreate (partial) the system of refrigeration with hydraulic compression. So say, you have a container (cylindrical piston) filled with water, then you apply pressure. Will the water's temp increase? Then, will the container's surrounding temp decrease?
  2. jcsd
  3. Oct 7, 2014 #2


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    Staff: Mentor

    If the temperature of the water increases, it is because you are doing work on the water, not because it is absorbing heat from the environment.

    In a refrigeration system, it is the expansion of the refrigerant that lead to cooling. Compression is then used to get the cycle going again.
  4. Oct 7, 2014 #3
    So in other words, correct me if I'm wrong, the compression process is just a fragment of the refrigeration process in which, the compression is the half part of the system?

    If the answer to my question above is yes, then, it implies that, in order to have a complete system of refrigeration, I must have a water compression part on one side and a water decompression part on the other side.
  5. Oct 8, 2014 #4


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    Staff: Mentor


    Well, water is not a good working substance. You get better result using the phase transition from liquid to gas, then back to liquid (by compression), and this will not happen with water at the right temperature for reasonable pressures.
  6. Oct 8, 2014 #5
    I see. Its seems rather difficult task, since phase change of evaporation and condensation requires tremendous amount of energy.

    The real reason why I'm curious about this, is that I'm thinking of creating the same refrigeration for my gaming computer's reservoir but in a compact scale. I want the small refrigerant to cool the liquid in the reservoir that circulates my computer parts. Do you think its possible? I meant about creating a miniature version of refrigeration.
  7. Oct 9, 2014 #6


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    Science Advisor

    It is actually an advantage. The mass of fluid required is much less with a phase change. The pump can be significantly smaller.
  8. Oct 9, 2014 #7

    Doug Huffman

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    Gold Member

    Once phase change is allowed, water becomes a useful, even common, refrigerant in (Lithium Bromide) absorption refrigeration and steam ejector refrigeration.
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