[Ian Brooks Posts: 3552 Status: Offline]

They also confirmed that both fans had the same 40watt power consumption. I can't believe the Dyson shifts 15 times more air for that 40watts - it would be too strong in the office!
Keith

It can't be more efficient. The air coming from the annular ring is at high velocity, and the power is proportional to V^2. On top of this, there will be significant losses as the high velocity air entrains the low velocity air - its a submerged jet, just a funny shape, like the submerged jet at the heart of the servovalves we make. It's not an efficient system...

Ian

[John Robertson Posts: 5136 Status: Offline WWW]

It's just marketing spiel Keith.  It uses 1/15th of the volume of air to move the remainder - it is no more efficient (and may even be less efficient) than a conventional axial fan (they wouldn't have missed the chance to say so if it was more efficient :rolleyes:).

It's still a cool looking device!

[rossfloyd Posts: 2025 Status: Offline]

I seem to recall Jetex did something similar on their model engines about 40 years ago?
 
Ross

[John Robertson Posts: 5136 Status: Offline WWW]

Explanation (and video) is at http://www.dyson.co.uk/technology/airmultiplier.asp

Just checked the price :eek: - £200 for a desk fan!!!!

[John Robertson Posts: 5136 Status: Offline WWW]

Superb bit of product design!

However, there is still a fan - it's in the base!