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Old 08-26-2019, 07:49 PM   #11 (permalink)
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The situation is a S(outhern) P(acific) Airstream grounded on the county tax roles so [shrug]. There exist four 14" roof vents. Air and conduit in and out there.

The pipe dream could be anything. A Dutch canal houseboat? I just like trolley-tops.

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Old 08-30-2019, 12:09 PM   #12 (permalink)
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I think rather than TEGs I would line the back of the panels with some type of water or glycol carrying device. Maybe solid, maybe a bladder that could be attached across the back. This way the panels themselves would become more efficient since the liquid would cool the panels and one would be getting hot water out of the deal at the same time. Seems like I read about someone trying this years ago but I can't recall the outcome. Certainly there would be a few issues to overcome. You'd have to consider the extra weight due to the water and figure out how to handle the ever present possiblity of leaks and of course what to do in the winter for those of you that have that, but I believe this would be a viable use of the back side of PV panels.Maybe I'll play with this next summer.
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Old 08-30-2019, 04:34 PM   #13 (permalink)
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In my case there are three 14" square roof vents, with a whole house fan on the center one. So it can suck up on the center one and blow down on the two ends. It may not be as efficient but it works with what's there.
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Old 09-01-2019, 01:15 PM   #14 (permalink)
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Quote:
Originally Posted by freebeard View Post
In my case there are three 14" square roof vents, with a whole house fan on the center one. So it can suck up on the center one and blow down on the two ends. It may not be as efficient but it works with what's there.
I think that's a brilliant idea for a grounded TT with holes in the roof already. Maybe a black painted box with recycled sliding glass door cartridges arranged as a pitched roof, with 6" metal ducting going lengthways to a plenum on each end and the middle. Insulate the box with 2" foam, paint the tubes and background black.
I think it would cook you quite nicely on the shoulder seasons in the PNW, and act as a bit of insulation in the dark of night when you close it all off.
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Old 09-02-2019, 12:54 AM   #15 (permalink)
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Thanks. The plan is for metal 2x4 channel with 2" of insulation. But instead of tempered glass doors, I'd probably spring for corrugated clear plastic over curved ribs with the corrugations running crosswise.
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Old 09-10-2019, 12:49 AM   #16 (permalink)
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Thermoelectric

Question /Discussion

Preface
Thermoelectric squares come in a couple of different sized dimensions available on ebay and etc. That being stated...

The curious question being is the following .. Could a direct application on a vehicle headliner(removed to expose metal skin provide a space for placement and there in make a setup for peltier cooling side toward personal space cooling
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Old 09-10-2019, 01:13 AM   #17 (permalink)
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Sure it would work... terribly. You've specified no objective though, so how are we to evaluate the question?

TEGs are like 5% efficient if you've set them up correctly (lots of heating and cooling surface area on both sides). AC is generally over 100% efficient by comparison.

I once bought a peltier cooler so I could experiment with overclocking my CPU. Even with a triple fan massive heatsink, it couldn't seem to dissipate heat fast enough to shed the minor amount of heat generated by the CPU plus the massive amount generated by the peltier. That, and there were concerns about condensation (you want water dripping from your headliner?).

So, you could mount peltiers to the roof, but it wouldn't have enough surface area to even achieve 5% efficiency, and you'd be rained on by condensation. The roof would turn into a giant frying pan before it was able to cool the cabin reasonably.
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Old 09-10-2019, 05:27 AM   #18 (permalink)
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The only practical use for TEGs in a car would either be:
- stuck to the exhaust behind the last cat with a big flat copper plate on the cool side in the airflow, or
- a 2-way coolant TEG harvesting the heat difference between coolant flowing from the engine to the radiator and the return flow.
I looked into the latter but it isn't cost effective at several $ per W.
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Old 09-10-2019, 10:06 AM   #19 (permalink)
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Solid state cooling takes about 4x as much power as modern refrigeration to cool something.
The only place it makes sense is in really tiny applications where adding refrigeration isn't practical.
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Old 09-10-2019, 08:13 PM   #20 (permalink)
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interior driver

FYI
application of driver side interior spot cooling....Texas is a little warmer than the PNW

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