Results 1 to 4 of 4
  1. #1

    Is there a difference between a 3 blade or 2 blade propeller on a heat pump?

    3 blade versus vs. 2 blade propellor on a heat pump.

    Is there a difference?
    Does one make the unit last longer?
    Is one more efficient than the other?
    Is one quieter than the other?
    Does one cause less vibration?

    Are there any functional features that separate the two?

  2. #2
    Join Date
    Jun 2001
    Location
    DFW
    Posts
    684
    Swapping out a different blade in an existing unit is a BAD idea. The unit is designed for one or the other.

    For a new design, a three bladed prop allows a smaller diameter, and it may lower the tip velociity which may decrease noise. Two bladed props are slightly more efficient.

  3. #3
    Join Date
    Jan 2009
    Location
    Keokuk, IA
    Posts
    5,520
    I suppose a 2 blade fan would have a little less rotating mass, 2 bladed fan is 33% less likely to be out of balance than a 3 blade design, but the effects of an imbalance will be greater, it's more difficult ot generate the same amount of static pressure with a 2 blade vs a 3 blade... so it's performance might drop-off quicker as coils become dirty or blocked.

    The shape of the blades will have more to do with the fan performance.

    Personally I don't really care as long as it moves the correct amount of air.

  4. #4
    in the end that is what makes the most sense, amount of air.
    I guess the amount of noise is the same?
    is the amount of vibration the same?
    Can vibration cause premature failure?

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
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event