Results 1 to 11 of 11
  1. #1
    Join Date
    Sep 2016
    Location
    Brazil
    Posts
    23
    Rep Power
    0

    Fans shutdown sequence in evaporative condensers



    What is the best fans shutdown sequence in evaporative condensers?
    I have 3 condensers with 12 fans each and more 2 condensers with 8 fans each.

    Tks, Renata



  2. #2
    Join Date
    Dec 2007
    Location
    australia
    Posts
    2,442
    Rep Power
    26

    Re: Fans shutdown sequence in evaporative condensers

    Could you please tell us what type or style of condenser & fans.
    If you turn fan/s off is fan/s sectioned off so they don't run backwards or short circuit air.
    The most effective way for power savings is to have VSD on all fans rampining up & downs together with a common set point in most cases. Very smooth operation can be achieved.
    Last edited by RANGER1; 05-07-2017 at 10:06 AM.

  3. #3
    Join Date
    Sep 2010
    Location
    Dorset
    Age
    69
    Posts
    209
    Rep Power
    10

    Re: Fans shutdown sequence in evaporative condensers

    From a previous thread on this subject my reply was.....

    Found this semi-sales literature which explains methods and reasons of fan control...

    http://bit.ly/2sg8cBI
    Brian, retired in Devon.

  4. #4
    Join Date
    Sep 2016
    Location
    Brazil
    Posts
    23
    Rep Power
    0

    Re: Fans shutdown sequence in evaporative condensers

    Hello Hanger1, you can see the fans and condenser in these pictures:

    IMG_8358.jpgIMG_8365.jpg

    Very nice post, FaultCode, it will help! For sure!

  5. #5
    Join Date
    Dec 2007
    Location
    australia
    Posts
    2,442
    Rep Power
    26

    Re: Fans shutdown sequence in evaporative condensers

    Renata,
    So installing a VSD on all fans a possibility?
    Save power, smooth operation.

  6. #6
    Join Date
    Sep 2016
    Location
    Brazil
    Posts
    23
    Rep Power
    0

    Re: Fans shutdown sequence in evaporative condensers

    Ranger1,
    I agree with you, but those evaporative condensers will be replace soon, then I just want to get better performance I can without invest much money.

  7. #7
    Join Date
    Aug 2014
    Location
    UK
    Age
    69
    Posts
    401
    Rep Power
    16

    Re: Fans shutdown sequence in evaporative condensers

    Hi Renata
    The liquid outlet connection is the most important part of any condenser. The liquid exiting the condenser must always have the coldest air blowing around it to gain as much subcooling as possible. So the fans furthest away from the liquid outlet go off first and the fans nearest the liquid outlet go off last this will guarantee the best subcooling possible

  8. #8
    Join Date
    Sep 2008
    Location
    Canada
    Posts
    746
    Rep Power
    12

    Re: Fans shutdown sequence in evaporative condensers

    Hi, Glen.
    I think that it is misunderstanding. You and FaultCode mentioned about air condensers, but Renata asked about evaporative condensers which typically use for industrial refrigeration. Evaporative condensers wetted by water and sequence of condenser fans is not so important. Water works as "flywheel" and pressure differential can be as low as 10-15 psig. Properly designed and installed evaporative condensers should not have subcooling at outlet. I think that not so much condenser fan sequence is important but right condenser pressure set point should chosen. Sometimes condensing pressure can float but benefits of floating are not significant.

  9. #9
    Join Date
    Aug 2014
    Location
    UK
    Age
    69
    Posts
    401
    Rep Power
    16

    Re: Fans shutdown sequence in evaporative condensers

    Segei
    Your right but the picture of the condenser is looks like a multi fan condenser but I may be wrong as the picture is not clear on my phone!?
    Last edited by Glenn Moore; 19-07-2017 at 11:37 PM.

  10. #10
    Join Date
    Sep 2008
    Location
    Canada
    Posts
    746
    Rep Power
    12

    Re: Fans shutdown sequence in evaporative condensers

    From the top it looks like air condenser. From the side it looks like evaporative condenser. I'm not familiar with these condensers.
    Last edited by Segei; 20-07-2017 at 03:54 PM.

  11. #11
    Join Date
    Sep 2016
    Location
    Brazil
    Posts
    23
    Rep Power
    0

    Re: Fans shutdown sequence in evaporative condensers

    Hello every one,

    I've decided to invest in VSD, I believe it is the best option.

    Thanks,
    Renata

Posting Permissions

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