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A/C raw water pick up

Discussion in 'Technical Discussion' started by Capt Ralph, Jul 7, 2018.

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  1. wdrzal, Sep 14, 2018
    #21
    wdrzal

    wdrzal Senior Member

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    You need to know the saturation temperature of the refrigerant your using, pressure is part of this calculation. This is where hot high pressure gas turns to liquid (the condenser). To make sure it stays liquid until it reaches the metering device , at least a few degrees of sub-cooling is needed.
  2. rgrennen, Sep 16, 2018
    #22
    rgrennen

    rgrennen New Member

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    Your ideal situation would be to have 1 through hull that that has two baskets and two pumps so that you never lose the system for maintenance or a failure. You just need to find out how much water flow you need for cooling and then make sure your suction line can handle that much flow without becoming turbulent. Turbulent flow will decrease the cooling effect and cause pumping issues.
  3. wdrzal, Sep 16, 2018
    #23
    wdrzal

    wdrzal Senior Member

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    Actually, the opposite is true: turbulent flow increases heat transfer. That's why the fins on heat exchangers, radiators , condensers, evaporators etc. have wavy fins, not smooth.
  4. Capt Ralph, Sep 16, 2018
    #24
    Capt Ralph

    Capt Ralph Senior Member

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    Ah, er, oh, I don't think so.
    Every bit of material exposed helps transfer heat (or cold). With all the wavy fins you see, there is just a bit more material to conduct & transfer energy (heat) to the air. Further keeping the air path even through out the area of the evap, air cooled radiator or air cooled condenser.

    With a gas (freon) to water heat transfer as on a boat, the smooth flow of water, making smooth and constant contact with the transferring surface is most desirable in the condenser.

    Smooth and even flow of water thru an engines heat exchanger is good also.

    Not to fast or slow, maximum contact and energy transfer to the water and back overboard.
    Last edited: Sep 16, 2018
  5. rgrennen, Sep 16, 2018
    #25
    rgrennen

    rgrennen New Member

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    Yeah you are 100% correct. Sorry I guess I had a brain fart there.
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