h a l f b a k e r yI like this idea, only I think it should be run by the government.
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Wall Sail-Fan
Better fan, works by vibration rather than spinning | |
Similar to the membrane in speakers, except much slower and much larger, if you have a large curtain set to slowly viberate, in and out, it would create a nice "breeze" in the room without the noise of fan propellers.
If a sail can move a ship, then a motor attached to a "sail" can probably move a
large volume of air around the room.
(?) Nukik Fan
http://www.geus.dk/ghexis/play-typ.htm
An example of a hanging wall fan [mylodon, Apr 14 2008]
similar effect for pc cooler
https://youtu.be/C3GKe7eXbPE
[pashute, Mar 23 2022]
[link]
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Quieter, yes, but like you said, large. |
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I thought the way a fan worked, from a human-cooling point of view, was this:
that it increased the rate at which (a) sweat could evaporate from the skin and (b) body heat could pass directly into the air by conduction
...
because
...
the movement of the fan carried away from the body air which was (a) already moistened and/or (b) already warmed to body temperature. |
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Would a vibration do these jobs as well as a more-or-less continous movement of air in one direction, (as generated by a spinning fan)? |
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From what I understand, this would create huge, slow-mo "sound" waves. And in my understanding, sound is generated by periodic pressure waves in the medium, not by the medium travelling across. Would that really increase convective heat loss from a human body? If any of my train of thought is faulty, please correct me, I am intrigued yet sceptical. |
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Ratwoman has a valid point if the fan is part of the wall, sealed at the edges. The air in the room would alternately pressurize and equalize. |
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But I read the idea as a curtain separate from the wall itself. If the Wall Sail-Fan is nearly the size of the wall, but has a gap behind it, moving the curtain back and forth will cause air to move along the adjacent walls, ceiling, and floor. The bulk of the “cooling” is from air moving around the edges of the “fan”. It's slightly more effective to place another of these, synchronized, on the opposite wall. |
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perhaps my choice of the term vibrate
was not the best. It alternatively is
tightened and released inaudibly.
Competely silent. Pushing the air in the
room. a slight angle of the curtain at the
top or bottom or one of the sides would
send the air circulating in the room.
coming back from the push when
loosened does not pull the air back but
rather from the sides so a fow of air is
created. You can simulate this with the
palm of your hand. |
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Kind of overkill, rather than moving a 10 ounce fan
blade you're moving a comparatively heavy curtain. |
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Might be pretty though so [+] |
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Also, great link so [+] for that too. |
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Bun, although I don't think this will be as effective at cooling people. You're moving much more air, but at a much slower speed. cfm only helps when the air is moving across the surface to be cooled. |
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Look up "punkahwallah fan". |
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I think that's a bit harsh. I'm sure there's a hand
operated punkawallah version under development? |
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