I used foil faced foam on a box for about 10 years, worked great!! BUT
the foil and then the insulation failed. The foil got ripped off by
the wind as the foam turned to a chalky substance that got on everything..
On 7/16/18 8:24 AM, Cameron Crum wrote:
I wonder if the foil faced foam would work without having to paint and
stucco.
Cameron
On Mon, Jul 16, 2018 at 10:07 AM, Chuck McCown <ch...@wbmfg.com
<mailto:ch...@wbmfg.com>> wrote:
Doesn’t look like I emailed the test results to anyone.
We started adding foam insulation with stucco and then white paint
on the exterior of lots of stuff.
An amazing combination.
*From:* Chuck McCown
*Sent:* Monday, July 16, 2018 9:00 AM
*To:* AnimalFarm Microwave Users Group
*Subject:* Re: [AFMUG] How to reliably cool a small enclosure in
direct sunlight?
Here is one snippit about exterior insulation:
Infrared camera proved what I proved years ago. The exterior
insulation
does the trick. A wall in shade is the same temperature
(inside) as a wall
in sun. Therefore, false roof does not decrease heat flux. I
spent one
whole summer testing all these assertions. Multiple boxes with
telemetry.
Paint, sun shades, vents, etc etc. White paint and exterior
insulation does
the job. Nothing measurable came from adding a shade to that
combination.
But to prove it once again, I had Jeremy use the infrared camera
to measure
all the walls and ceiling in Ticaboo. Sunny walls were no
warmer than those
on the shade side.
*From:* Lewis Bergman
*Sent:* Monday, July 16, 2018 8:54 AM
*To:* AnimalFarm Microwave Users Group
*Subject:* Re: [AFMUG] How to reliably cool a small enclosure in
direct sunlight?
On peltier you also have to locate the power supply outside of the
box. Or at least that is what I found. The heat load from the PS was
always more than the peltier it powered could keep up with.
Everything has a bit of inefficiency built in that shows up as heat.
On Mon, Jul 16, 2018 at 9:52 AM Lewis Bergman
<lewis.berg...@gmail.com> wrote:
Are you saying white paint outperformed heat shields? That's
awesome info. I always thought heart shields were the best.
On Fri, Jul 13, 2018, 7:43 PM <ch...@wbmfg.com> wrote:
I did a bunch of trials one summer testing a variety of
methods including heat shields, exterior insulation,
interior insulation, convection ventilation, forced
ventilation, peltier effect active cooling.
#1 by a long shot is painting the enclosure bright white.
*From:* Bill Prince
*Sent:* Friday, July 13, 2018 6:37 PM
*To:* af@af.afmug.com
*Subject:* Re: [AFMUG] How to reliably cool a small
enclosure in direct sunlight?
1. Add a thermostatically controlled ventilation fan
2. Put a heat shield up on the south side of the enclosure.
This can be just a plate of aluminum, painted white on the
sun side, and mounted to the enclosure with 1" standoffs
We have a site like yours, and just the fan keeps the
temperature below 120° F (49° C). I think if we added the
heat shield we could drop it another 10° F.
bp
<part15sbs{at}gmail{dot}com>
On 7/13/2018 4:51 PM, Sterling Jacobson wrote:
I’ve got a few side of the house enclosures exposed to
direct sunlight part of the day.____
____
Inside the electronics are about ready to melt. Like 90C+
CPU temps.____
____
These are about 3’ x 3’ x 12 deep or something like that,
so not a lot of room.____
____
What are you guys using to keep these things decently
cool?____
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