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  1. #1
    Join Date
    Aug 2005
    Location
    San Diego,CA
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    285

    410A discharge line temp??

    Does anybody know what the actual discharge line temp is on a 410a system at 65f ambient?
    Sink or Swim!
    A Man has to know his limitations..
    To be old and wise, one must be young and dumb..

  2. #2
    Join Date
    Mar 2011
    Location
    East Coast FL
    Posts
    1,058
    So many variables...

  3. #3
    Join Date
    Aug 2005
    Location
    San Diego,CA
    Posts
    285
    When everything is perfect...
    My boss wants to install a plate heat exchanger off the discharge..
    Sink or Swim!
    A Man has to know his limitations..
    To be old and wise, one must be young and dumb..

  4. #4
    Join Date
    Mar 2011
    Location
    East Coast FL
    Posts
    1,058
    What type of system are we talking about here? Air cooled? Water cooled? High efficiency residential? What does the cooling load look like? The discharge superheat (and actual line temp) can vary quite a bit depending on the system load and effectiveness of the heat exchangers. What are you looking to do, heat reclaim? You may be able to calculate a number at design conditions but there again it's usually a small fraction of the operating hours. If you are doing heat reclaim the goal is to capture as much heat as you can, so one would select a heat exchanger with somewhat larger capacity than the compressor.

  5. #5
    Join Date
    Aug 2005
    Location
    San Diego,CA
    Posts
    285
    Ok, how about a ball park under low load conditions. Let's say 20 ton rtu.
    Sink or Swim!
    A Man has to know his limitations..
    To be old and wise, one must be young and dumb..

  6. #6
    Join Date
    Jan 2008
    Location
    Dallas ,Texas
    Posts
    3,707
    Probably going to run about the same as R-22. 120-180 like as been said too many variables.
    UA 100

    It takes three people to do anything around here. Two do the work, one explains to the crowd of people who showed up when they seen smoke and flames.

  7. #7
    Join Date
    Mar 2011
    Location
    East Coast FL
    Posts
    1,058
    Low load air cooled rtu at 65* ambient with some OA and 48* return gas? One would be lucky to hit 135*

  8. #8
    Join Date
    Aug 2009
    Location
    Prattville, Alabama
    Posts
    2,036
    Quote Originally Posted by thegoodlistener View Post
    Probably going to run about the same as R-22. 120-180 like as been said too many variables.
    I agree. Years ago, I was told by one of my mentors (who is long retired) that given all other things being constant (operating conditions, ambient conditions, efficiency, application, etc...), that when comparing different refrigerent systems (r11, r22, r12, etc...) the temperatures don't change, just the pressures those refrigerents operate at. I have found that to be very helpful.

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