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  1. #1
    Join Date
    Dec 2003
    Posts
    20

    What is Superheat?

    What is the definition of superheat?
    In simple way to explain to someone?


    Tia

  2. #2
    Join Date
    Jul 2006
    Posts
    6,536
    It is the amount of heat add to a refrigerant after it has already turned to a vapor from a liquid.
    You sure are cocky for a starving pilgrim.

  3. #3
    Join Date
    Apr 2006
    Location
    Parma, OH
    Posts
    361
    This article appeared in a recent issue of ContractingBusiness.com.
    http://contractingbusiness.com/resid.../cb_imp_17963/
    It's been one of our best reads lately.

    I've also posted a pdf below. It's a Q&A that will appear in ContractingBusiness.com's August issue. Provided by Emerson Climate Technologies.

    Terry McIver
    Attached Images Attached Images
    Terry McIver, executive editor, Contracting Business magazine.

  4. #4
    Join Date
    Apr 2002
    Location
    Omaha, NE
    Posts
    1,561
    Quote Originally Posted by rctech View Post
    What is the definition of superheat?
    In simple way to explain to someone?
    Tia
    I think ZACH's explanation is the easiest for a layman to understand: "It is the amount of heat add(ed) to a refrigerant after it has already turned to a vapor from a liquid." The reason we measure superheat is to make sure that the liquid refrigerant in the evaporator coil has fully changed from a liquid to 100% a vapor, since we only want vapor returning to the compressor suction. If any liquid gets sucked in, it can do bad things to the compressor over a period of time. We want just enough superheat to verify a 100% vapor, but not too much because it would hurt the cooling efficiency of the unit, and excessively high superheat would also not keep the hermetic (fully encapsulated) motor/compressor cool enough. So, you want some superheat but not too much.

  5. #5
    Join Date
    Jul 2006
    Posts
    6,536
    Thanks i didnt want to get into p/t charts its easier to just tell them its used to cool the compressor and to make sure it is completely vaporized before it come back to the condenser. Then they cant really follow that most of the time.
    Remember we think completely different from laymen.
    You sure are cocky for a starving pilgrim.

  6. #6
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,671
    Quote Originally Posted by rctech View Post
    What is the definition of superheat?
    In simple way to explain to someone?


    Tia
    Compressor Insurance.


    Seriously, you have already been given the best answers. I have nothing of value to add.

  7. #7
    Join Date
    Aug 2006
    Location
    Vancouver , Canada
    Posts
    300

    Superheat definition

    Year - 1979
    Instructor - Lloyd ' Andy ' Anderson
    Me - wet behind the ears pre-apprentice HVAC kid

    Andy used to stand at the front of the class, wave his hand and say - -

    '' Superheat is ALWAYS the difference of the refrigerant at pressure - temperature relationship, and the actual temperature of the vapor ''

    Then he used to ' spot pick ' one of the students at any given time during any given day for the rest of the year and we would have to recite, verbatim, the definition. I will never forget it !!!

    Works for me -

    Freonguy
    Superheat and subcooling tell it all !

  8. #8
    Join Date
    Dec 2008
    Posts
    94
    Superheat is very important to the system operation and longevity. Believe it or not, there are lots of repair men out there that don't know how to check it or what it is. Fortunately superheat was drummed into us at tech school (ITT)

  9. #9
    Join Date
    Jul 2005
    Location
    FLORIDA
    Posts
    1,163
    superheat is the amount of heat above the refrigerants saturation point, check you pressure temp chart, learn it love it

    r-22 system running 68.5 psi suction 40 degree saturation point add 15 degrees superheat suction line temp 55 degrees

    sub-cool would be the opposite the amount of heat below its saturation point
    once you think you've seen it all
    (THINK AGAIN)
    I would rather work for free than be look upon as a thief!!!!!

  10. #10
    Join Date
    Jul 2005
    Location
    FLORIDA
    Posts
    1,163
    Quote Originally Posted by jpsmith1cm View Post
    Compressor Insurance.
    .
    i like this anwser best
    once you think you've seen it all
    (THINK AGAIN)
    I would rather work for free than be look upon as a thief!!!!!

  11. #11
    Join Date
    Mar 2009
    Location
    Spokane WA
    Posts
    304
    Have you ever heard anyone call it "cool back"? I had a couple guys asking me for troubleshooting help one time and they were calling it cool back. It only became really confusing when they said "they didn't have any cool back". LOL Then I had to make them say the correct terminology and ask if it was too low or too high...... HEHE

  12. #12
    Join Date
    Jun 2009
    Location
    Toronto
    Posts
    7

    Confused

    Quote Originally Posted by zachhvac View Post
    It is the amount of heat add to a refrigerant after it has already turned to a vapor from a liquid.
    This occurs in the condensing unit or evap?? I was taught that super heat is the evap and subcooling is the condenser. If the change of state is vapour to liquid it would be the condesing unit?

  13. #13
    Join Date
    Feb 2008
    Location
    California
    Posts
    2,066
    Quote Originally Posted by hvactech79 View Post
    If the change of state is vapour to liquid it would be the condesing unit?
    Yes.

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