Results 1 to 3 of 3

Thread: Compressed Dry Air

  1. #1
    rnferrer Guest

    Compressed dry air

    I am trying to find ways to conserve energy in a plant. Compressed air is dryed with desiccant dryers to about -40 degrees F for use in pneumatic actuators and air pulse for dust collectors. Although the -40 F is the requirement based on manufacturer's literature, can I reduce the dryness level considering that the lowest temperature that the dry air will be exposed to is about 72F?

    Thanks,

    Bobby Cruz

  2. #2
    Dennis Hauch - Freeport, TX, USA Guest

    Compressed Air DP

    Bobby Cruz,

    When compressed air at 100 PSIG is let down to atmospheric pressure through a nozzle, even a pulse clean nozzle found in your typical dust collector, the pressure ratio is such that sonic velocity will occur in the nozzle throat. A simple expression based on the ratio of specific heats for air says that temperature in the throat area of the nozzle will fall to approximately minus 16 degrees F when it is flowing.

    From the above we can say that compressed air having a DP of minus 20 degrees F and stored at 72 degrees F should not pose a condensation problem inside the nozzle itself. There could still be a problem, however, and its on the outside surface of the nozzle body. If the ambient air surrounding the nozzle has a DP above minus 16 degrees F, and it most assuredly will, moisture will condense on the nozzle surface. It may be necessary then to insulate the nozzle to prevent exterior condensation.

    Regards,

    Dennis Hauch

  3. #3
    rnferrer Guest
    Dennis,

    Thanks for the reply.

    Bobby

Similar Threads

  1. Compressed Rice Husk Bagging
    By mochtarw in forum New Projects, Tenders, Inquiries
    Replies: 1
    Last Post: 7th September 2010, 1:48
  2. Compressed Air Consultants
    By Paul F Edwards in forum Consultants Database
    Replies: 0
    Last Post: 17th July 2009, 3:25
  3. Pumping Water with Compressed Air
    By kevinb in forum Pneumatic Conveying
    Replies: 4
    Last Post: 24th May 2009, 20:10
  4. Selection of Compressed Air Buffer Tank
    By JimLee in forum Pneumatic Conveying
    Replies: 21
    Last Post: 13th March 2006, 9:21

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Single Sign On provided by vBSSO