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targis58
Samba Member
Joined: July 11, 2006
Posts: 539
Location: sunnyvale,ca
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 Posted: Mon Aug 31, 2009 9:24 pm Post subject: |
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| spitsnrovers wrote: |
Hey targis, nice idea. I was trying to figure out something similar with a computer fan.
Mind if I copy?  |
nope! 
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90 westy 2wd w/ TBD |
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spitsnrovers
Samba Member
Joined: December 17, 2005
Posts: 940
Location: Calgary, Canada
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| Posted: Mon Aug 31, 2009 10:07 pm Post subject: |
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Aw shucks. 
Well, I'll mount the clamp on the opposite corner, thereby circumventing your pending patent rights and establishing my own design criteria.
Ha ha! 
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'88 VW Westfalia
'75 Triumph Spitfire 1500 |
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targis58
Samba Member
Joined: July 11, 2006
Posts: 539
Location: sunnyvale,ca
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| Posted: Mon Aug 31, 2009 11:22 pm Post subject: |
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| spitsnrovers wrote: |
Aw shucks.
Well, I'll mount the clamp on the opposite corner, thereby circumventing your pending patent rights and establishing my own design criteria.
Ha ha! |
 I meant to say NO I don't mind. I enjoyed your ideas of upgrading your vanagon on your website that I would like to do the same for my van. Go ahead and make/improve my fan idea and show us. I am planning on making a few more for my van.
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90 westy 2wd w/ TBD |
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1621
Samba Member
Joined: May 15, 2006
Posts: 2174
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| Posted: Tue Sep 01, 2009 1:00 am Post subject: |
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Excellent work with the CPU fan! I may attempt to copy the design myself.
| Quote: |
| Say that the interior of the van was 12'x4'x4'. That's 192 cubic feet. The 3" fan is rated at 600 cubic feet per hour. That means you'll get about 3 air changes per hour inside the van, or once every 20 minutes. Again for comparison, a normal bathroom fan provides about 10-12 air changes per hour or once every five minutes. |
Good info, but I think there's more to consider here. The interior of the van is not quite as large as stated due to the physical objects that take up some of this space. The seats, cabinets, dash, and decklid - not to mention bodies sleeping - serve to reduce the interior air volume significantly. As such, I would think that at most the volume would be closer to 2/3 of the 192cf, or 128cf.
If one were to consider the goal of adding a roof vent, or CPU fan, it is more than likely there to reduce humidity produced by our breathing, cooking and heating while inside the van. The combination of these three still doesn't produce the amount of humidity that a shower might, and thus there wouldn't be any need to provide the 10-12 air changes per hour as noted in the bathroom fan comparison, though I'm certain this number could be achieved with the correct set-up.
I like that this type of ventilation is active versus passive, and could potentially make the interior of the van a more pleasant "living" space without having to keep the windows open at night. It's certainly not an air conditioner, nor do I really think it would effectively reduce interior temps. It's merely good for keeping the interior of the van drier during those times when it would be beneficial (i.e. camping, coming in out of rain storms, returning from skiing - surfing - mtb ride, etc.).
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