That would do...
From: Bill Prince
Sent: Monday, July 16, 2018 11:09 AM
To: [email protected]
Subject: Re: [AFMUG] How to reliably cool a small enclosure in direct sunlight?
The Piaggio P.180 Avanti can do 400 knots for only $1.6 million.
I've been in one. Nice bird.
bp
<part15sbs{at}gmail{dot}com>
On 7/16/2018 9:07 AM, Chuck McCown wrote:
If I ever buy another plane I want it pressurized, certified for flight in
known ice and capable of doing 300 kts.
From: Bill Prince
Sent: Monday, July 16, 2018 10:03 AM
To: [email protected]
Subject: Re: [AFMUG] How to reliably cool a small enclosure in direct
sunlight?
I sold it a few years ago. After we moved up into the mountains, the
round-trip time to the airport just made flying impractical (over an hour each
way).
Yes. Same kind of plane. However JD made a number of bone-headed decisions
that made his demise all but a foregone conclusion. If we have a few minutes at
the computer museum, I can cover some of the more major bad decisions that were
made. Plus the fuel selector mechanism that had been installed on that
particular airplane was kind of a kluge on top of a Rube Goldberg setup.
Stupid. Stupid. Stupid.
bp
<part15sbs{at}gmail{dot}com>
On 7/16/2018 8:57 AM, Chuck McCown wrote:
Do you still have the plane?
Is that what John Denver was flying on his final trip?
From: Bill Prince
Sent: Monday, July 16, 2018 9:44 AM
To: [email protected]
Subject: Re: [AFMUG] How to reliably cool a small enclosure in direct
sunlight?
When I was building the Long-EZ, there was a debate among fiberglass
airplane builders about the tolerable temperatures for ambient-temp cured
fiberglass/epoxy structures. The point being that too high heat would be "very
bad" for a fiberglass/epoxy airplane.
So Burt Rutan and his crew did a bunch of tests using various colors. What
they found was that pure white had the lowest heat gain of any color. Black the
worst. Silver was right up there with gray. Almost any tint had a significant
heat gain over ambient.
I painted my EZ pure white with no tints whatsoever. It did have blue/gold
trim colors, but the trim was basically just accent stripes on the fuselage and
winglets.
bp
<part15sbs{at}gmail{dot}com>
On 7/16/2018 8:31 AM, Chuck McCown wrote:
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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