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GaryBIS

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Posts: 243
Reply with quote  #41 
Hi Greg,
Yes, I think that the oven thermometer in the pictures uses a bimetallic spring.  But, I'd guess its much smaller than the vent spring?

I guess the next step is to try to build an actual stagnation vent and see if the bimetallic spring can drive it.

Gary

cwwilson721

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Posts: 303
Reply with quote  #42 
Remember:

For this approach to be effective, it needs both a top and a bottom vent opening at the same time...
GaryBIS

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Posts: 243
Reply with quote  #43 
I'm actually thinking that just leaving the bottom vent open all the time might be OK.  Does not seem like you would get much circulation if the top vent is closed and bottom open?

gary
cwwilson721

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Posts: 303
Reply with quote  #44 
To avoid the stagnation event/temps, you want the heat to leave ASAP. To do this, top and bottom is preferred, or 'lifting' of the glazing.

Just bottom would not vent, anyway...Heat rises, remember?

Edit: I re-read your post..The issue with leaving bottom always open is 'stuff' getting in...Snow, dirt, critters, even hard rain. All the above can cloud/fog/dirty the glazing...
GaryBIS

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Posts: 243
Reply with quote  #45 
It would still have top and bottom vents, but the bottom vent would be open all the time.  

I agree that you need both top and bottom vents to get any significant flow.  Just not sure that both have to have to be able to close.

Gary
cwwilson721

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Reply with quote  #46 
Dead cooked mouse, as far as I know, doesn't improve efficiency in anything, except cats sleeping soundly...
Garage_Hermit

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Posts: 2,240
Reply with quote  #47 
Very nice test, Gary, I must say , and nicely photographed too !

G_H



__________________
(1)  "Heat goes from hot to cold, there is no directional bias"
(2) It's wrote, "voilĂ " unless talking musical instruments...
GaryBIS

Registered:
Posts: 243
Reply with quote  #48 
Hi,
Thanks GH.

I think the dead mouse problem could be solved by just screening the open vent with hardware cloth or the like.

Did a little more looking for a source for the bimetallic spring, but no luck yet.

Gary
gbwillson

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Posts: 2,314
Reply with quote  #49 
Gary-

An Air cooled VW Beetle had what they called a thermostat. It has a threaded end and extends and contracts. Each engine had 2 thermostats, one for each bank of cooling fins. I recall them being quite strong for their size. If you can find a junk yard that has an air cooled beetle engine...
Come to think of it, any air cooled engine likely has something similar to restrict the flow of air across the fins until the engine warms up. Otherwise, You could order them online or from a dealer.


Below are some pics

Greg in MN[comp]

1.jpg

Air_Cooled_Engine_2.jpg

Thermostat12062010_0611019.jpg
GaryBIS

Registered:
Posts: 243
Reply with quote  #50 
Thanks Greg,

The VW thermostats look ideal, but they seem to be in very short supply and commanding high prices -- $50 for a very used looking one on ebay.

Working on an actual vent today just using the bimetallic spring to directly rotate a 3 inch diameter vent louver.

Gary

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