Those are options. For sure, black will both absorb more and radiate more.
The question is if you can keep it shaded. If not, then white is the choice.
In a perfect world, you would paint it chameleon. White in the sun, and
black in the shade/dark.
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part15sbs{at}gmail{dot}com
On Fri, Jul 9, 2021 at 6:47 PM Chuck McCown via AF <af@af.afmug.com> wrote:
> Someone ought to test that.
>
> Sent from my iPhone
>
> On Jul 9, 2021, at 7:40 PM, Steve Jones <thatoneguyst...@gmail.com> wrote:
>
>
> I could have sworn it was afmug sourced, but somewhere along the line I
> picked up that a shaded enclosure will actually perform better if it is a
> dark color. The whites and reflective colors are better at reflecting
> energy off of them, but not at dissipating it, dark colors shed heat
> better. In a shaded environment reflectivity is moot.
>
>
> On Fri, Jul 9, 2021, 11:09 AM Chuck McCown via AF <af@af.afmug.com> wrote:
>
>> My tests had very little live load. I think only 100 watts so that is
>> probably the major difference.
>> We just use a color called satellite white. I don’t think it matters
>> much.
>>
>> *From:* castarritt
>> *Sent:* Friday, July 9, 2021 9:26 AM
>> *To:* AnimalFarm Microwave Users Group
>> *Subject:* Re: [AFMUG] Solar and shade for AE Fiber Cabinet
>>
>> Chuck, is there a specific paint you used to shield against solar
>> radiation? I rolled a gallon of white elastomeric roof coating from home
>> depot onto one of our DDB boxes, and while it did drop the temp slightly,
>> the results weren't that impressive. I think the issue with our test is we
>> chose a site that has ~1.2kW of power draw, so most of the heat was likely
>> from the equipment in the box rather than direct sunlight.
>>
>> On Fri, Jul 2, 2021 at 1:21 PM Chuck McCown via AF <af@af.afmug.com>
>> wrote:
>>
>>> 20+ years ago, I set up 4 identical outdoor enclosures. Temp
>>> telemetry. Some live load, don’t remember the details. They were about
>>> 24” cubes. All started out as gray. Tried sun shields, exterior
>>> insulation, vents, fans, peltier cooling modules. Silver paint, white
>>> paint. The overwhelming #1 thing that lowered temps was the satellite
>>> white paint. By a long stretch. Then filtered powered vents. Silver
>>> paint was worse than gray. I wonder if the railroad still used silver.
>>> Sun shades did little to help if the box was satellite white. Interior
>>> styrofoam insulation helped a bit, not much, but was cheap and easy to add
>>> to the white paint.
>>>
>>> Sent from my iPhone
>>>
>>> On Jul 2, 2021, at 11:39 AM, Sterling Jacobson <sterl...@avative.net>
>>> wrote:
>>>
>>>
>>>
>>> Super hot out here in Utah.
>>>
>>>
>>>
>>> My fiber cabinets running Active switches are getting harder to maintain
>>> and AC units on the side of the cabinets are starting to fail faster.
>>>
>>>
>>>
>>> I’ve had the thought of shading them with a permanent four post
>>> structure and a reflective white painted cover to shade them from the
>>> southern sun exposure.
>>>
>>>
>>>
>>> Then I thought, well, maybe it might be interesting to “shade” the
>>> cabinet with solar panels as well.
>>>
>>>
>>>
>>> Is anyone doing this?
>>>
>>>
>>>
>>> The AE cabinets all have Alpha FXM 15 or 20A units running the UPS to a
>>> string of four 12v AGM batteries.
>>>
>>>
>>>
>>> I do have limited rack space in some of these available since the
>>> batteries sit in a slide out section below.
>>>
>>>
>>>
>>> Haven’t done solar in like a decade since I had remote WISP type sites.
>>>
>>>
>>>
>>> Is this doable to offset power costs and also get the temp down for the
>>> cabinet?
>>>
>>>
>>>
>>> Or is it just a huge time suck and money pit for no real return?
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