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 <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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