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  1. #1
    Join Date
    Apr 2010
    Location
    Southeast
    Posts
    40

    Insulation on liquid line

    How much effect would it have if a liquid line (1-3/8") from a rack to a remote header is not insulated with armoflex? The run is approximately 140 feet...Engineers with this particular supermarket had us install it. I have seen little improvement in temperature and the sight glass at header. Was it really worth the money they spent??? Any thoughts.

  2. #2
    Join Date
    Nov 2009
    Location
    West Yorkshire England
    Posts
    405
    I wasn't aware that liquid lines were insulated unless they were heat pump configured.

    What does insulating a liquid line actually acheive?
    Martyn

    50 & 60 hz but 100's worse

  3. #3
    Join Date
    Mar 2003
    Posts
    7,321
    what did it replace? what are ambient conditions? what is the issue with the system operation as you perceive it to be? might help to see what you are thinking

  4. #4
    Join Date
    Apr 2010
    Location
    madison wi
    Posts
    139
    the only reason that you would insulate a liquid line is if you have really long run and you have and/or a subcooler on the rack. in this case I can see why they would want it done. espicially if it is a low temp RH keeping the liquid SC allows more efficency at the txv and there for a smaller system is needed and a smaller elect bill. on all the supermarkets that I have seen they always want the liq line insulated for this reason. it is not necessary but does help. you wont notice it at the sight glass at the header. that should be clear anyway-if not then perhaps more liq. is needed. where you will notice it is at the rack itself. the comp's may start to cycle instead of running flat out

  5. #5
    Join Date
    Jul 2000
    Location
    Guayaquil EC
    Posts
    10,308
    In the old days liquid lines were never insulated because they were typically run within a space which was at a lower temperature than the liquid line.

    With the advent of natural and mechanical subcooling there was a need for liquid line insulation because now the liquid refrigerant could gain heat from the space, causing a partial loss of the expected energy savings.

    If the liquid line temperature to this remote header will never be at a temperature lower than the surrounding space temperature then it was a waste of money to insulate it.

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