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  1. Thread: subcooling

    by cmclifton
    Replies
    73
    Views
    1,774

    Sure about that? Edit: nevermind, yes there is...

    Sure about that?

    Edit: nevermind, yes there is a noun form of the same word. the liquid is a saturate. as is the vapor. the point I was making was about the vapor and liquids being at different...
  2. Thread: subcooling

    by cmclifton
    Replies
    73
    Views
    1,774

    Same silly argument, different day. We all know...

    Same silly argument, different day. We all know that you can have vapor with subcooled liquid laying underneath it, nobody wants to admit it because they've been telling people all their lives that...
  3. Obviously, you know everything you need to know....

    Obviously, you know everything you need to know. Why are you asking for help?
  4. I can say for sure that they were still using the...

    I can say for sure that they were still using the exterior mounted handles around 98-99, but I don't know when they actually got changed.
  5. Replies
    8
    Views
    240

    As long as we still need freeze driers in...

    As long as we still need freeze driers in biotech/pharma, there will always be compound compressors. Carlyle hasn't stopped making them and probably shouldn't. We don't need more reasons to buy...
  6. Replies
    32
    Views
    758

    I wholeheartedly disagree that the plumbing of...

    I wholeheartedly disagree that the plumbing of that liquid line will cause uneven feeding. You've got a full column of liquid being held back by a TEV on either evaporator. Those TEVs are going to...
  7. Replies
    32
    Views
    758

    Nothing needed aside from standard good piping...

    Nothing needed aside from standard good piping practices.
  8. Replies
    21
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    921

    ^^My thoughts align EXACTLY with PHM up there.

    ^^My thoughts align EXACTLY with PHM up there.
  9. Replies
    21
    Views
    921

    ^Ive been told by several old school guys that...

    ^Ive been told by several old school guys that they never unsweat a drier for that exact reason.

    The only time I remember reading about a drier being baked in an oven on this site was because a...
  10. Replies
    33
    Views
    1,641

    and dont ever drop them. ever.

    and dont ever drop them. ever.
  11. Replies
    18
    Views
    703

    I feel like any penetrating oil that actually...

    I feel like any penetrating oil that actually works well is going to stink like that though...

    I carry Kroil in my truck and swear by it. Works well enough that you can use a TINY bit to do the...
  12. Replies
    15
    Views
    976

    The supply houses should all be able to get you...

    The supply houses should all be able to get you 502, but I doubt they keep it in stock these days. If I were buying some, I'd get it from ebay or some other place online as cheap as possible. A 30#...
  13. Replies
    33
    Views
    1,641

    You can also take your amp clamp (meter) and open...

    You can also take your amp clamp (meter) and open it, put the jaws around the coil so that one jaw is at the top and one is down near the bottom. Think like you're trying to get the jaws around the...
  14. Replies
    22
    Views
    740

    I've been around systems using HC refrigerants...

    I've been around systems using HC refrigerants off and on since I was brand new. It's really not tough to deal with. Run a hose outside, purge nitrogen, cut things out instead of unsweating...

    The...
  15. ^ No new installs with HCFC refrigerants due to...

    ^ No new installs with HCFC refrigerants due to the phase out... Maybe doesn't apply here?
  16. Worn contactors on 3-phase compressors can ground...

    Worn contactors on 3-phase compressors can ground them. (Single phase the motor and it's toast very quickly)

    Floodback can do it.

    Low side leaks on systems that run in a vacuum eventually do...
  17. Take any fan blade, flip it over, and the blade...

    Take any fan blade, flip it over, and the blade pitch is still in the same direction. It still flows air one way, only less efficiently in the case of a typical evap or condenser blade.

    A ceiling...
  18. It happens even with the big money biotech...

    It happens even with the big money biotech companies too.

    I recently spent 4+ months working on a freeze drier that had been sitting unused for TWO YEARS. It was sitting idle because the person...
  19. We cut one open at our shop after it restricted...

    We cut one open at our shop after it restricted completely. Total blockage. Found the desiccant encased in what looked like epoxy. We just figured that must be what happens when you put too much of...
  20. Replies
    133
    Views
    5,007

    Cincinnati Sub Zero makes test chambers with...

    Cincinnati Sub Zero makes test chambers with 410A. They have one with a compound compressor that will make -50C on 410A. It looks like a great low temp refrigerant when you're looking at the PT...
  21. Replies
    133
    Views
    5,007

    I've got a cascade process chiller with redundant...

    I've got a cascade process chiller with redundant compound Bitzer compressors for the low stage. -47F, also R507. Interstage suction cools a plate heat exchanger to subcool the liquid line before...
  22. Thread: r12 walk in

    by cmclifton
    Replies
    94
    Views
    2,357

    Coalescing oil separators, and just the simple...

    Coalescing oil separators, and just the simple fact that there's no oil left in the stream by the time you get past the last receiver and heat exchanger. The argon doesn't carry the oil the way the...
  23. Thread: r12 walk in

    by cmclifton
    Replies
    94
    Views
    2,357

    The overall COP... I haven't the slightest. I...

    The overall COP... I haven't the slightest. I wouldn't expect it to be good. 3 horse scroll to cool 5 cubic feet with something like 80% "on time". The rest... tbh I don't have the vocabulary to...
  24. Thread: r12 walk in

    by cmclifton
    Replies
    94
    Views
    2,357

    In the case of a Thermo -150 freezer, that argon...

    In the case of a Thermo -150 freezer, that argon does get somewhat condensed. It never becomes a full column of liquid, but it's not just there to keep pressures up. It's the argon that cools the...
  25. Thread: r12 walk in

    by cmclifton
    Replies
    94
    Views
    2,357

    I work on those things too. (-150 is a little...

    I work on those things too. (-150 is a little more common) You can't measure superheat and you know it.

    One of those refrigerants is argon. You're not ever going to get a Copeland engineer to be...
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