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Old 05-19-2024, 03:07 PM   #11 (permalink)
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Svietlana II - '13 Peugeot 308SW e-HDI 6sp
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Quote:
Originally Posted by SC380D View Post
3. Reflective sunshades in windows (when parked)
Self explanatory.
Why only when parked? You can block the rear side windows (semi-)permanently, as you do not need them during driving. This will reduce some of the greenhouse effect when the sun is lower.

How about parking in the shade? Sometimes you'll have to walk farther across the parking lot, but it may be worth it.
If you have a regular parking space or driveway, then maybe you can build a shade over it?

You can also try a thermal cover

[randomly found image]

Here is another idea: Thermal insulation.
The metal chassis is great at conducting heat, so if you stick insulation between the metal and the interior liner and panels (some time-intersive work required) it will help keep the hot out and the cool in.

[randomly found image]
An additional benefit is that it will help make the interior quieter.
A down side to fuel economy is the additional weight.

Many RVs and RV conversions have thermal insulation on the floor, sides and roof to keep warm at night.
More recently, EVs benefit from thermal insulation, to reduce both heating and cooling load.

Quote:
Originally Posted by freebeard View Post
When parked yes. But what about the aero penalty?

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Old 05-19-2024, 04:36 PM   #12 (permalink)
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Quote:
But what about the aero penalty?
What about it? It needs A-B-A testing.

Of course it only works with approx. vertical windshields. The Beetles max camber is at the B-pillar so it's in a positive pressure gradient. It's a wing not a pocket.



With a properly sized and located gap, you'd have a Coanda nozzle/air curtain; it might improve the aero.
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Old 05-21-2024, 01:58 AM   #13 (permalink)
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Another entry or three, in the 'free AC' race:
Cooling Our Homes Without Electricity?
MIT combines insulation evaporation and radiation, by layering aerogel, hydrogel and a mirrored substrate.

It's basically a high tech swamp cooler. MIT uses an expensive aerogel, Universities in China and Germany have a cellulose-based aerogel that may be more viable.

There is promising research into anisotropic aerogel and single-pane insulating windows.

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