Engine Room ventilation - Air out issue

Discussion in 'Boat Design' started by Lucya, May 20, 2018.

  1. Dragonpoint
    Joined: Feb 2015
    Posts: 8
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    Location: Vancouver's Island

    Dragonpoint Junior Member

    Let's Assume a Fan Diameter of say , 2.5 feet . 0.75 Metres would work as well . What the equation is then missing is , at normal fan operating speed ,
    what amount of air is transferred from inside the Engine room , through the fan ( times two ).
    Volume of a Sphere won't work , because the fan cutouts are cylindrical , not spherical . You need the Volume of the Circle contained within the 0.75
    Metre Circular Fan Cutout .
     
  2. Dragonpoint
    Joined: Feb 2015
    Posts: 8
    Likes: 0, Points: 1, Legacy Rep: 10
    Location: Vancouver's Island

    Dragonpoint Junior Member

    Now what is needed is the Volumetric Efficiency of each of the Two Fans .
     

  3. Dragonpoint
    Joined: Feb 2015
    Posts: 8
    Likes: 0, Points: 1, Legacy Rep: 10
    Location: Vancouver's Island

    Dragonpoint Junior Member

    If these Evacuator Fans were emptying a mineshaft , they would have to be very large , maybe larger than O.75 Metres , and they would probably be better than 1.0 Horsepower , much more would be needed . 2.5 HP , Rotating a 2.5 Meter Diameter Fan , you need to find out how many Cubic Meters per Second
    or CFM , Cubic Meters per Minute , the fans could move .
     
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