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  1. Replies
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    And you have to be impressed with some of the...

    And you have to be impressed with some of the entrance and exit ramps around here. They’re like 10 stories up!!!

    I found "The Holy Grail" pub in Plano. I think I’m going to like it here. :D
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    That's a fact! So where are all the brew pubs...

    That's a fact! So where are all the brew pubs around here anyway? And what is with all of this traffic!!! :gah:
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    You need two measurements to determine the state...

    You need two measurements to determine the state of the air.

    If you can measure dry bulb and wet bulb, you have it figured out.

    If you can measure dry bulb and relative humidity, you have it...
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    Seems appropriate that I mention this in this old...

    Seems appropriate that I mention this in this old thread. ;)

    I have resigned from Tecumseh Products on March 28th, and accepted a position as product manager for DunAn Precision Inc, a...
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    No. A couple of researchers by the names of Wolf...

    No. A couple of researchers by the names of Wolf and Pate did the actual correlation. The correlation used capillary tube flow tests with various refrigerants.

    The sordid details are published...
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    Bingo! As the tech services manager at Tecumseh,...

    Bingo! As the tech services manager at Tecumseh, there are all sorts of ways one can design a single phase motor for a compressor. One size fits all start components can be very useful diagnostic...
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    One other issue with the replacement refrigerants...

    One other issue with the replacement refrigerants is that they affect the capacity of the compressor. For example, an R-12 compressor on MP39, R-409A, or Hot Shot can deliver significantly more...
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    Sage advice... ;)

    Sage advice... ;)
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    POE oil is more resilient. The real problem here...

    POE oil is more resilient. The real problem here is motor windings will roast at these temperatures. Mineral oil would break down at these temperatures measured at the discharge line.


    Probably...
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    It is also a measure of the valve's rating. A...

    It is also a measure of the valve's rating. A valve with a nominal 1 ton rating and a 20 percent bleed will have a total 1.2 ton nominal rating. A 2 ton valve with a 20 percent bleed would have...
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    R-407A: R-32/R-125/R-134a (20/40/40) R-407F:...

    R-407A: R-32/R-125/R-134a (20/40/40)
    R-407F: R-32/R-125/R-134a (30/30/40)

    R-407F trades 10 percent R-125 for R-32. R-125 has a bad GWP. R-32 has a good GWP. Both R-407A and R-407F are way...
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    It means a 15 percent uncontrolled flow at the...

    It means a 15 percent uncontrolled flow at the valve's nominal rating conditions. Incidentally, this also increases the valve's capacity 15 percent at its nominal rating conditions.
  13. Life in the ASHRAE 34 Standards committee. ;)

    Life in the ASHRAE 34 Standards committee. ;)
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    You know things aren't going well for Obama when...

    You know things aren't going well for Obama when Charlie Rangel turns on him: http://cnsnews.com/news/article/melanie-hunter/rangel-i-love-obama-red-line-syria-embarrassing
  15. Wax was originally a problem with low temp...

    Wax was originally a problem with low temp systems using R-502 and mineral oil. The problem was significant enough to cause Sporlan to invent the "HH" filter-drier. The "HH" filter-drier...
  16. Not to confuse things here, but a supercritical...

    Not to confuse things here, but a supercritical fluid can become liquid if you remove enough heat from it. But this is not "condensing" in the classic sense... vapor becoming liquid. A...
  17. I agree. It clearly shows the supercritical...

    I agree. It clearly shows the supercritical region to be a dense something or other than cannot be defined as a vapor or liquid - or at least not having an vapor-liquid interface.
  18. The best definition of critical point, IMHO: the...

    The best definition of critical point, IMHO: the saturated state where the liquid and vapor phases
    become indistinguishable.

    At the critical point, you are still at saturation, but cannot...
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    Using R-502 with POE oil won't be a problem. I...

    Using R-502 with POE oil won't be a problem.

    I doubt going from R-404A to R-502 will give you any significant change in system capacity. Your problem likely lies elsewhere.

    Start by examining...
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    The math is simple either way... Add them up. ;)

    [/QUOTE]
    The math is simple either way... Add them up. ;)
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    Internal overloads do reset themselves. ;)

    Internal overloads do reset themselves. ;)
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    I know Wes very well. He is one that I pay...

    I know Wes very well. He is one that I pay attention to when he writes articles and commentary for our industry.

    My concern with a large R-407C refrigeration system using MO/AB oil with a...
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    Hydrocarbons are miscible with MO/AB oil. That...

    Hydrocarbons are miscible with MO/AB oil. That is why they are added to HFC refrigerants which, of course, are not miscible with MO/AB oil. The trick is to use enough hydrocarbons to get the MO/AB...
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    You're confusing HFC refrigerants having no...

    You're confusing HFC refrigerants having no hydrocarbons added and service replacement HFC refrigerants that do.

    Most everybody agrees having 95 percent POE oil in the system is unnecessary when...
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    Take a look at the "Refrigerant TP - PT Chart"...

    Take a look at the "Refrigerant TP - PT Chart" web app here: http://boxload.tecumseh.com/
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    GT1980, you can admit it to us, you're doing...

    GT1980, you can admit it to us, you're doing drugs... ;)

    Or I'm getting too old to do this blogging thing. :eek2:
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    https://www.rses.org/assets/rses_journal/0812_Comp...

    https://www.rses.org/assets/rses_journal/0812_Compressors.pdf
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    Refrigerant thermodynamic properties don't lie. ;)

    Refrigerant thermodynamic properties don't lie. ;)
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    Mmmmm... I remember doing this pdf. I should...

    Mmmmm... I remember doing this pdf. I should update it once in a while, wouldn't you think? :angel:
  30. Thread: NATE Exam

    by Andy Schoen
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    Congratulations. Intellectual growth should...

    Congratulations.


    Intellectual growth should commence at birth and cease only at death. - Albert Einstein
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    Current in the motor winding creates the magnetic...

    Current in the motor winding creates the magnetic field to turn the rotor. With a single phase motor, something must be done to create a "rotational" magnetic field. With a PSC motor, an additional...
  32. Big systems also. ;) Never fear. Clean...

    Big systems also. ;)




    Never fear. Clean systems prevail with POE oil



    Welcome to the "new norm". ;)
  33. In theory, MO will work with either propane or...

    In theory, MO will work with either propane or isobutane. But it is not ideal for a number of reasons. AB oil is an excellent choice with either propane or isobutane. POE will be used, however, as...
  34. Propane and isobutane do have a GWP value. Ok,...

    Propane and isobutane do have a GWP value. Ok, ok, its only about 4. :D

    Odds heavily favor EPA allowing HC venting in the near future
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    Been there, done that. (As you have :D)

    Been there, done that. (As you have :D)
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    If you used R-12 refrigerant, you're correct...

    If you used R-12 refrigerant, you're correct using the AEA3440AXA.

    If you used a R-12 service replacement refrigerant, you're fine with the AEA3440AXA.

    If you used R-134a, you need a AEA3440YXA.
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    Same here. I've had past occasion to train some...

    Same here. I've had past occasion to train some of their newbie sales engineers. I'd like to hear how well they're doing. ;)



    He's a slacker! :D
  38. Thread: R-22

    by Andy Schoen
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    One of my better efforts ;):...

    One of my better efforts ;): https://www.rses.org/assets/rses_journal/0812_Compressors.pdf
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    A refrigeration system using a capillary tube...

    A refrigeration system using a capillary tube expansion device is, by definition, a critically charged system.

    A refrigeration system using a receiver is, by definition, not a critically charged...
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    The definitive publication on this subject...

    The definitive publication on this subject :angel: https://www.rses.org/assets/rses_journal/0812_Compressors.pdf
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    I'll be lurking around the show and TC meetings.

    I'll be lurking around the show and TC meetings.
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    Words of wisdom. ;)

    Words of wisdom. ;)
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    Acceleration due to gravity, not speed. ;)

    Acceleration due to gravity, not speed. ;)
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    There are a number of hydrocarbon blends out...

    There are a number of hydrocarbon blends out there for R-22, including plain old propane. You cannot legally retrofit a unit in the U.S. with a hydrocarbon refrigerant.
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    Let's hope so. Fortunately, Michigan will likely...

    Let's hope so. Fortunately, Michigan will likely have unemployment rates better than California and Nevada for some time to come. ;)
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    Both the Michigan state house and senate are...

    Both the Michigan state house and senate are controlled by republicans. Its governor, Richard Snyder, is also a republican.
  47. Thread: POE Oil

    by Andy Schoen
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    Professor Emeritus perhaps. ;)

    Professor Emeritus perhaps. ;)
  48. Thread: POE Oil

    by Andy Schoen
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    I miss doing them, even if they caused me a fair...

    I miss doing them, even if they caused me a fair amount of time and effort to create.
  49. Thread: POE Oil

    by Andy Schoen
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    POE oil can tolerate higher temperatures than AB...

    POE oil can tolerate higher temperatures than AB or mineral oils. But it suffers hydrolysis in the presence of moisture. A diatribe of mine while employed at a former employer of mine on this...
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    A diatribe I wrote for a former employer. ;) ...

    A diatribe I wrote for a former employer. ;) http://sporlanonline.com/December%202009%20Cold%20WAR.pdf
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