Results 1 to 8 of 8
  1. #1
    Join Date
    Aug 2016
    Location
    Oklahoma
    Posts
    199
    Post Likes

    Non-Azeotropic blends

    Are the properties still the same after recovering and recharging?


    Sent from my iPhone using Tapatalk

  2. #2
    Join Date
    Aug 2017
    Location
    Kansas City, MO
    Posts
    186
    Post Likes
    Quote Originally Posted by Chris4u13 View Post
    Are the properties still the same after recovering and recharging?


    Sent from my iPhone using Tapatalk
    Theoretically yes, they should be, as long as you didn't lose a significant amount of it to atmosphere. If you lose very much, it's impossible to tell, which part of that blend is lost. Thus, having a different blend, essentially creating a new refrigerant.

  3. #3
    Join Date
    Aug 2016
    Location
    Oklahoma
    Posts
    199
    Post Likes
    Thread Starter
    Fractionation is another conncern, when reusing these refrigerants.
    Great study.
    http://docs.lib.purdue.edu/cgi/viewc...&context=iracc


    Sent from my iPhone using Tapatalk

  4. #4
    Join Date
    Aug 2017
    Location
    Kansas City, MO
    Posts
    186
    Post Likes
    Fractionation is what I was describing...

  5. #5
    Join Date
    Aug 2017
    Location
    Kansas City, MO
    Posts
    186
    Post Likes
    But I just realized the title says, " non azeotropic blend" which would mean a standard refrigerant, like R22. To which case there would not be fractionation. Instead, it would remain R22, with the same properties as before.

  6. #6
    Join Date
    Jul 2000
    Location
    Guayaquil EC
    Posts
    13,157
    Post Likes
    Quote Originally Posted by wreakingHaVAC View Post
    ...the title says, " non azeotropic blend" which would mean a standard refrigerant, like R22.
    That isn't correct. A refrigerant may be either a pure compound or a mixture (blend) of two or more refrigerants. ... Examples of mixtures are R502, R404A and R407C. A mixture can behave either as a pure refrigerant (azeotropic mixtures), or differently (non-azeotropic, or zeotropic,mixtures).

    https://www.achrnews.com/articles/82...o-refrigerants

    Check out Icemeister's Back Room

    Read My Latest Rambling:
    What Is Mechanical Subcooling?

    ...and a new calculator:
    Nitrogen Pressure Calculator

  7. #7
    Join Date
    Aug 2017
    Location
    Kansas City, MO
    Posts
    186
    Post Likes
    Quote Originally Posted by icemeister View Post
    That isn't correct. A refrigerant may be either a pure compound or a mixture (blend) of two or more refrigerants. ... Examples of mixtures are R502, R404A and R407C. A mixture can behave either as a pure refrigerant (azeotropic mixtures), or differently (non-azeotropic, or zeotropic,mixtures).

    https://www.achrnews.com/articles/82...o-refrigerants
    That's correct. My bad.

  8. Likes Chris4u13 liked this post
  9. #8
    Join Date
    Jan 2015
    Location
    Iowa
    Posts
    913
    Post Likes
    Are the properties still the same after recovering and recharging?
    Part of the answer to this question is: Why are you ecoveringng the charge? When working with refrigerantnt blends if the recovery is to repair a leak then you should start over with new refrigerant as the concentrations of the mixed refrigerants has likely changed and is no longer really R407C or R410a, etc. The Purdue Fractionation documentnt was written in the early days when not too many understood mixed or blended refrigerantsts. When I think back to the 1995 1996 time frame I know many thought the different refrigerants in the blend would leak off in equal percentages. As the Purdue document showed that was not really the case and "topping off" was not a good practicece.

    If the reason the charge is being removed to correct a non leak condition you should be able to reuse what you have recovered. Small volumes <5 pounds) my preference is to just replace with new.

  10. Likes Chris4u13 liked this post

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Related Forums

Plumbing Talks | Contractor MagazineThe place where Electrical professionals meet.