Quote:
Originally Posted by Shortie771
How does that work without any sort of motor, cable, or manually adjusting?
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AFAIK both version ... be it blinds or the sliding screens both have to have an adjusting mechanism ... both need some type of mechanism... or they are fixed and don't adjust.
The Blind style sees the most pressure on it as the air speed increases ... It can be designed to either close from this increased air speed ... or open from this increased air speed ... which ever one way you design it , in order to make it do the other would require some type of over-ride mechanism that is strong enough to overcome the forces.
In the screen version you have some additional options:
#1> If you make the two screens flat , then the screen mechanism is nearly equally easy to open or close at slow or fast wind speeds ... unlike the blinds which would have a favored position one way or the other.
#2> If you design the screens to each have shaped holes in a more 3D style system, the front one 3D toward the front and the Rear one 3D toward the rear , they could still easily slide past each other , but one would design the 3D surface to create a wind flow preference ... so that like the blinds , it has a preference to be either closed or open at faster wind speeds , or slower wind speeds... I suspect the front most screen would have the most impact from the 3D shape, and the rear one might be able to be left as a flat screen without loosing much travel ability in the mechanism.
#3> You could also have a mechanism attached to the #1 above ... a solenoid , linear motor, etc ... depending on how elaborate you want to make it ... it could be a simple open / closed ... or you could give yourself various degrees or steps between 100% open and 100% closed ... this could be manually controlled by the driver ... or it could be setup as feedback from something else, sensor, etc.
One nice thing about screen system is that the screens do not have to move as much as a blind style would have to , to have a similar open to closed change.
Another nice thing about the screen is that one really only has to work out movement for one screen ... the front one maybe ... as the entire screen moves it effects all the holes lining up with the second screen ... a blind style , needs each of the blinds to be hinged, and each blind to have a moving mechanism... ie more points of potential failure.
Also the blind style needs more thickness clearance room than the screen version does... the blinds are X thick when closed , and have to have the clearance to turn to be open Y thick when open air flow... the screen are always equally thick open or closed.
The blind style system can end up working fine ... if you prefer it ... use whatever you like ... I was just pointing out a possible alternative option to consider.