120F and Hangin In There

[sakita]

Plenty toasty in AZ today and the Netonix gear keeps on ticking.

At one of our locations we have a temperature sensor that picks up the temperature in the traffic signal cabinet and just outside the cabinet (next to the surface of the cabinet - at some point it needs to be moved somewhere better to get the ambient). In any case, when it is 120 outside it is > 130 inside the cabinet...

Example In-Cabinet Temperature

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From a different location, here's a screenshot of the switch status page:

Status Page

To add insult to injury, at one point Accuweather said it was 119 but the 'real feel' was 121. Yeah, that's what we get instead of wind chill.

[WisTech]

Wow that's hot. What part of AZ?

[rebelwireless]

wow. ever thought of a ground source cooling loop? I don't have a picture on me but it's pretty easy. Just take a loop of black plastic pipe and dig a hole. bury it except for the two ends and run them into the enclosure. A small high pressure blower fan pushing air in one of the ends is enough to circulate the air. That with some white paint on the enclosure and you can keep a box pretty cool. I bet a 50' loop would knock that down to 100F.

[sakita]

Mesa, AZ. Luckily the temperatures have plummeted to 111° the last couple of days.

A number of years ago there was a ground cooling system we looked at. As I recall it was a more complicated one that used liquid with a heat exchanger. The idea was to keep the temperature at or below ambient inside the cabinet. Your idea sounds simpler. That combined with planting a nice tree or two next to the cabinet would certainly help.

In any case, the traffic equipment is typically specified to 74° C and we've had some equipment that has literally run for 20+ years despite the heat.

Gloves are a good idea when touching anything this time of the year. The state tattoo is shaped like the back side of a seat belt buckle. (and that's the expression when getting the tattoo).

[amp]

Here i am running at 107F outside right now

But the new netonix 8 port dc is running 9060rpm @
61c Board
81c CPU
78c PHY
74c PSU

I was hoping to do a little better than 61c and unfortunately i don't have a device that will give me ambient air temps. I assume each model will be a bit different but i'm blowing a lot of air through that box. 30 Watt blower, sun shade, high efficiency psu's etc.

[sirhc]

Well just imagine how hot a fanless switch would be.

That board temp is plenty fine.

Considering the CPU and PHY are rated to 125C and the rest of the board to around 80C.

The fan is there to prolong the life of the switch as you would be surprised what air flow even hot air flow does to prolong the life of electronics.

[amp]

Yeah we have a ie3000 cisco, its fanless and has hit 81c :-/

What would you consider the hottest temp that won't significantly reduce the life of a standard netonix?