Results 1 to 3 of 3

Thread: Formula for Blower Capacity

  1. Angry Formula for Blower Capacity

    friends i need capacity of blower what i already have but how i can calculate theoritically,(Actually Capacity is 3500 CMH)
    it's operated at 350 degree C.temperature at suction .having 5 HP motor.

  2. #2
    Teus Tuinenburg

    Professional Experience 53 Years / 9 Month Teus Tuinenburg has 53 Years and 9 Month professional experience

    Discussions 1937 Teus Tuinenburg acceded to 1937 discussions, Articles 10 Teus Tuinenburg wrote 10 articles, Publications 0 Teus Tuinenburg Tuinenburg released 0 publications

    Searching nothing specified

    Know-How Conveying (1469) Teus Tuinenburg used this tag 1469 times, Pneumatic Conveying (1267) Teus Tuinenburg used this tag 1267 times, Pneumatic (562) Teus Tuinenburg used this tag 562 times

    Dear raj raval,

    From your data, you must be referring to a centrifugal fan rather than a positive displacement blower.

    A centrifugal fan has a volume pressure curve, which is very much depending on the geometry of the impeller vanes.
    Therefore, it is almost impossible to calculate that curve, without knowing the geometry.

    One point on that curve can be measured easily, by blinding off the outlet en measure the generated pressure.
    That is the point on the curve, where the volume flow is zero.

    The nameplate data can cause some confusion.
    Assume that the nameplate data give the airflow at a certain pressure, then that is another point on the curve. (The working point)
    However, some manufacturers give as performance data the maximum pressure at airflow is zero and the maximum airflow at open inlet and open outlet. All the energy is then used for dynamic pressure drop and internal losses.

    Assuming your data as a “working point” on the curve gives the following approximation.
    (pressure ratio for a fan is assumed almost 1)

    pressure drop = Power / airflow

    pressure drop = 5000 Watt / 0.972 m3/se = 5142 Pa # 51.4 mbar (dynamic pressure converted into static pressure)

    Alternatively, measure the whole curve or ask the manufacturer for the required data.

    If the fan is not performing as required, then replace the fan, according a new design specification.
    It is a small fan after all.

    Have a nice day

  3. #3
    Hi there,

    there is something seriously amiss here. Almost 60m3/min at 350C and only 5hp just does not sound correct. Please check the name plate data and see if you can find out more about the performance data or the manufacturer.

    Ralf Weiser

Similar Threads

  1. Actual Handling Capacity against Design Capacity
    By shankar in forum Bulk Ports & Shipping
    Replies: 1
    Last Post: 9th February 2015, 12:19
  2. Calculating Capacity of Airslide Blower
    By sanjithchandran in forum Silos, Hoppers, Bins, Bunkers & Domes
    Replies: 3
    Last Post: 28th November 2009, 19:14
  3. Blower Capacity/Pressure Drop
    By RJB324 in forum Pneumatic Conveying
    Replies: 26
    Last Post: 24th December 2006, 17:37
  4. Blower Capacity Calculation
    By ajaykumar in forum Pneumatic Conveying
    Replies: 0
    Last Post: 4th October 2006, 8:29
  5. Vacuum Blower Issues/ Material in Blower
    By RJB324 in forum Pneumatic Conveying
    Replies: 4
    Last Post: 3rd October 2006, 15:23

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