 So, @rek and I got super interested in these vacuum tubes that people put on their rooftops. We've just cooked our first meal with the sun, and are still a bit shocked at how well it worked out. It's pretty cool out today, it was able to cook potatoes thoroughly in an hour. #solarpunk cooking 145 comments
 @neauoire @rek Will these also be good for audiophiles? (Kidding, of course.)
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25 Mar 2023 at 18:58 | Open on bbs.kawa-kun.com
For more DIY projects to do with the vacuum tubes, there's this really cool workshop website. The vacuum tubes are designed to keep the heat in, we have also a reflector that concentrates the sun rays. Some people put these little sun dials that works like a bull's eye to indicate if the reflectors are all angled.  I translate the name of the website, because "Sun in our dishes" is a great idea.  @ddlyh we're not going to share the specific brand but I'm sure you can find similar models based on the handle design. We found ours at a local hardware store. @neauoire That's so cool! 🤩 Which curve is the reflector? Parabolic? Or is it the elusive compound parabolic concentrator? @clh3 it's a piece of bent stainless that curves to follow the shape of the tube. I'm not sure what its name is @neauoire Ooh🤔 that sounds like an involute curve, the first curve segment of a compound parabolic concentrator. @neauoire One word of caution 🚧 : I've heard of tubes freezing and breaking if they're exposed to clear night sky -- but this event occurred with vacuum tubes with interior metal tubes filled with water. The research group at UC Merced had to cover their vacuum tube + reflector experiment at night due to hazardous radiative cooling. @clh3 ours are different, we use the household type that is normally installed on rooftops.   @nina_kali_nina @rek When you boil water, do you pour water directly in, or do you have a long skinny pot that you can slip inside?
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 @NicholasLaney @slew @rek it's not pressurized I think. The vacuum part is the double-walled glass tube.  @42GB @neauoire Ppl in France group-buy the vacuum tubes so you can build something similar, might be a good route: https://www.dusoleildansnosassiettes.com/boutique @ifixcoinops @rek we bought it, as we don't have access to a machine shop to make the reflector. @baba_lilith @neauoire yea building one out of a box with reflectors is what we had planned at first, but the temp doesn't quite get high enough in those for certain things i want to make. Vacuum tubes can get real hot very fast. @neauoire Hello! I found this post via a boost from @baba_lilith (thank you!). I’ve wanted one of these solar ovens for some time 😍 does it clean easily? @elana @baba_lilith we're about to find out, we're having lunch in a minute and will clean it after. I'll let you know :) @elana aliexpress sells the tubes for 90$ish. If you can make your own reflectors that's a pretty good deal :)   @neauoire I'm wondering whether these are viable for me (southern England), and guessing not. Where do you live, please? (Approximately!) @SoftwareTheron victoria, canada. We'll test them tomorrow in an overcast sky and let you know. @RebeccaBoyce we don't have a roof(we live on a sailboat), but you just need an area exposed to the sun. @neauoire I had never seen this. Interesting. Could even be useful in certain environments where a fire/smoke might attract unwanted attention. "...pretty cool out... cook potatoes thoroughly in an hour."!? Sarah and I were looking at these a few months ago (probably you linked haha). Thats waay faster than I expected! Sounds actually good! They were quite expensive though? We've been cooking from solar for the past 4 days. So far we've tried potatoes, seitan, brussel sprouts and today we're cooking legumes for the first time. 🌻 The big advantage of using the sun to cook our meals is that instead of using the pressure cooker over the gas stove, which creates a lot of moisture in the galley, we'll be able to make our meals in the summer without heating up the habitat!  @neauoire super cool :) i remember seeing one of these in a lil feature of this super-inventive nomadic shepard grazing in the usa and being awed by it :> can you take a pic that's a bit farther out and shows how it's set up in general? @neauoire thank u! appreciate seeing the entire thing :> what a perfect addition to pino!  @neauoire don’t forget the advantage of the satisfaction that comes with using fire that you stole from the gods It blows my mind how hot it gets, check out the steam coming out of the vacuum tube- uh oh I angered it    @vacuumbeef depends on the food inside, but it starts to steam in about 15 minutes.
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 I was wondering how you tell how far along you are in the cooking process with the vacuum tube solar cookers? Is it time? smell? can you see the food? or do you have to open it and look? And if you do have to look, does that increase the cooking time depending on how impatient you are? Also given the long skinny nature. I'm curious if baguettes work. Can you fit an oven thermometer in there? I think the vacuum tubes get hotter than you can get with less insulated cookers.
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