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  1. #1
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    Remote Condenser Sizing



    Gents,

    Your opinion please. When engineering a new remote condenser, how would you size it?

    Currently I've been educated to first select my compressors at design conditions, say at -25C SST/45C SCT, which for this exercise we will pick a compressor capable of 100kW cooling capacity, with 145kW THR.

    I now use the previously selected compressor and change the SST from -25C to -5C. Then, using the increased THR of say 165kW resulting from the new SST to select my condenser.

    The theory being that condenser will more than cope with the recovery involved in a total plant failure or after excessive defrosts. But then be oversized, but costly for initial install, when operating at design conditions.

    Thoughts?
    Last edited by Goober; 17-11-2015 at 03:53 AM.



  2. #2
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    Re: Remote Condenser Sizing

    I'm no design engineer, but sometimes in the condenser selection it may be borderline on one size, so this can help make decision.
    Client, if a good educated one can be given both selections as well, but not in all cases.
    Maybe go I between what you think & say -10 to 15 C SST & see what it comes up with.
    Rooms should recover pretty quickly after defrost unless abused.

  3. #3
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    Re: Remote Condenser Sizing

    From my experience in a hot ambient, after working out the condenser capacity needed, I choose the next size so unit can cope with the problems you have mentioned.

    One stem bigger is not a big difference in price and unite will work better.

  4. #4
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    Re: Remote Condenser Sizing

    Goober.
    I usually select capacity at -10'C SST for condenser selection and use MOP TXV's as well to limit load on compressor after defrost .

  5. #5
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    Re: Remote Condenser Sizing

    Cheers all. Seems we are in a agreement. I shall power on doing what I'm doing then.

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