Foil or shiny silver stuff seems to draw more heat than
black paint for some reason.
I think it is black in the infra red spectrum.
Just leave a chrome plated wrench out in the sun for a few
hours.
Black wrench will be much cooler.
You can actually pick up the black wrench but you can get a
blister from picking up and holding a chrome one.
One of my kids still has a scar from the chrome tab of a car
seat belt.
We knew she hated to be put in the car seat, figured all the
screaming was just the normal objections.
*From:* Cameron Crum
*Sent:* Monday, July 16, 2018 9:24 AM
*To:* AnimalFarm Microwave Users Group
*Subject:* Re: [AFMUG] How to reliably cool a small
enclosure in direct sunlight?
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
<[email protected]> 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
<[email protected]> 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 <[email protected]> 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:* [email protected]
*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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