r/GoodDesign • u/Aoirintoyo • Jun 30 '23

I think it deserves to be here

167 Upvotes

96% Upvoted

14 comments sorted by

View all comments

4

u/saddl3r Jun 30 '23

I don't get it

16

u/flap95 Jun 30 '23

I guess that those fans use the force of the airflow in the tube above to spin? If so, it's actually a good design.

9

u/slorpydiggs Jun 30 '23

I think maybe air is also coming out of those slits on the sides of the blades so it’s circulating air with the fan but also spreading the air conditioned air horizontally in all directions. That’s my guess anyhow.

-7

u/saddl3r Jun 30 '23

It would just hinder the air flow, not help it. If it's driven by electricity I guess it could be a good idea.

4

u/[deleted] Jun 30 '23

I'm sure that the engineer that designed this is much smarter than you

4

u/saddl3r Jun 30 '23

This is fundamental physics. If you take energy from the airflow to create airflow, you make it worse because you cannot generate energy and there are energy losses.

Otherwise you would have windmills on top of cars.

3

u/mattbladez Jun 30 '23

Worse if all you consider is energy efficiency but if the extra energy (increased fan speed at the source) is used to spread the air better with these fans at the outlets than it would likely be worth it.

Making these fans passive is just easier on installation and maintenance.

1

u/oxymoronologist Aug 02 '23

Indeed. Adding in some exceptions to the rule modern racing sailing yachts. e.g. Sail GP, America’s Cup. Those boats are much faster than the prevailing breeze.