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  1. #1
    Join Date
    Aug 2011
    Posts
    8
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    Flour Mill Packing Area Air Conditioning

    Hi All
    As my title suggest, I have an Air Conditioning requirement for Packing Area in a flour mill.

    As the product is wheat, I cannot take return air as it will choke my filter and coil.
    So I have decided to have a fresh air AHU.
    My room is 10m X 13.5m X 6.8m Height.
    My ambient is 46C and required inside temperature is 25C.

    How do I calculate Airflow of my AHU?
    Is it correct to estimate heatload in HAP with outside air requirement as 100% of supply air?

  2. #2
    Join Date
    Sep 2007
    Location
    edmonds wa
    Posts
    4,267
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    Why just have a engineer design and spec the correct unit for you and not have any worries?
    UA Local 32

  3. #3
    Join Date
    Aug 2011
    Posts
    8
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    Thread Starter
    Its a design & built job for me

  4. #4
    Join Date
    Jun 2012
    Location
    Northern NV
    Posts
    1,885
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    Talk to your refrigeration suppliers. They can probably set you on the correct path. Did not see a location, but in this area I'd be using evaporative cooling.

  5. #5
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    24,447
    Post Likes
    Quote Originally Posted by sree.s3 View Post
    Hi All
    As my title suggest, I have an Air Conditioning requirement for Packing Area in a flour mill.

    As the product is wheat, I cannot take return air as it will choke my filter and coil.
    So I have decided to have a fresh air AHU.
    My room is 10m X 13.5m X 6.8m Height.
    My ambient is 46C and required inside temperature is 25C.

    How do I calculate Airflow of my AHU?
    Is it correct to estimate heatload in HAP with outside air requirement as 100% of supply air?
    Why not? Filter changes are still cheaper then electric.

    I agree with buford, jobs like these require an engineer.................................






    then we get to fix them later.

  6. #6
    Join Date
    Sep 2007
    Location
    edmonds wa
    Posts
    4,267
    Post Likes
    I would bet it will be a very customized unit to deal with both the cooling load, humidity, and air filtering requirements. Not a place for a home made resi style equip.
    UA Local 32

  7. #7
    Join Date
    Jun 2012
    Location
    Northern NV
    Posts
    1,885
    Post Likes
    Oh, and the other "little" problem is that if you are recirculating flour dust, then the equipment must be explosion proof, so I'll change my vote to engineered. Ever seen a video of a flour mill exploding?

  8. #8
    Join Date
    Jul 2012
    Location
    WA
    Posts
    2,808
    Post Likes
    Calculate airflow based on heat load. An engineer should really be involved for a situation like this. How will you be exhausting air from the space? I've had a customer with a similar situation, but it was milk powder. They weren't allowed to let milk powder escape the building.

  9. #9
    Join Date
    Mar 2019
    Posts
    2
    Post Likes
    Quote Originally Posted by sree.s3 View Post
    Hi All
    As my title suggest, I have an Air Conditioning requirement for Packing Area in a flour mill.

    As the product is wheat, I cannot take return air as it will choke my filter and coil.
    So I have decided to have a fresh air AHU.
    My room is 10m X 13.5m X 6.8m Height.
    My ambient is 46C and required inside temperature is 25C.

    How do I calculate Airflow of my AHU?
    Is it correct to estimate heatload in HAP with outside air requirement as 100% of supply air?
    Sir.we have the same current situation, as a plant refrigeration & air-con engineer I always encounter problems in flour mill bagging area because of the recirculating air with a huge flour dust coming into AHU, that's why I propose chiller unit(R404A), with no recirculating air, rather than fresh air intake (w/motor drive fans) to AHU to avoid fins choke & abnormalities in the system.

    Is my design applicable in the current situation?I am new in this job assignment as a Mechanical Engineer in my 10yrs work experienced.

  10. #10
    Join Date
    Mar 2019
    Posts
    2
    Post Likes

    Applicable Air-con Design in Flour Mill Bagging

    Quote Originally Posted by sree.s3 View Post
    Hi All
    As my title suggest, I have an Air Conditioning requirement for Packing Area in a flour mill.

    As the product is wheat, I cannot take return air as it will choke my filter and coil.
    So I have decided to have a fresh air AHU.
    My room is 10m X 13.5m X 6.8m Height.
    My ambient is 46C and required inside temperature is 25C.

    How do I calculate Airflow of my AHU?
    Is it correct to estimate heatload in HAP with outside air requirement as 100% of supply air?
    Sir.we have the same current situation, as a plant refrigeration & air-con engineer I always encounter problems in flour mill bagging area because of the recirculating air with a huge flour dust coming into AHU, that's why I propose chiller unit(R404A), with no recirculating air, rather than fresh air intake (w/motor drive fans) to AHU to avoid fins choke & abnormalities in the system.

    Is my design applicable in the current situation?I am new in this job assignment as a Mechanical Engineer in my 10yrs work experienced.

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