h a l f b a k e r yBirth of a Notion.
add, search, annotate, link, view, overview, recent, by name, best, random
news, help, about, links, report a problem
browse anonymously,
or get an account
and write.
register,
|
|
|
Wireless Electric Blanket
I don't know if they have these or not, none of the ones I've found online specify wire or wireless. I've always seen them with a wire. | |
Simple. Yet I haven't seen one (if you can find one, post a link and I'll delete). This would be easier than ever today with those new paper-like batteries to avoid uncomfortable bulky spots.
Paper Battery
http://news.bbc.co....hnology/6945732.stm
[21 Quest, Sep 23 2007]
Mr funny hand warmers?
http://www.mojolond...nny_hand_warmer.htm
[the dog's breakfast, Sep 27 2007]
Electric socks thaw cold feet
http://www.abc.net....publish_1118303.htm
Battery-powered wool socks. [baconbrain, Sep 27 2007]
Please log in.
If you're not logged in,
you can see what this page
looks like, but you will
not be able to add anything.
Annotation:
|
| |
A Microwave bed?... No, A Rotating Microwave bed?... |
|
| |
Wow... paper batteries... roll able cd's .. bendable video displays... its gettin nuts. |
|
| |
No battery. Too much power needed. Use induction. |
|
| |
You could use microwaves. Not sure anyone would buy it, though. |
|
| |
Use microwaves, then you could dispense with the blanket part. |
|
| |
//Use microwaves, then you could dispense with the blanket part.//
And a round, rotating bed, to even the cooking. |
|
| |
What is the power density of these paper batteries? I think you are going to need a lot of power. Let see, it looks like an electric blanket consumes 100W-200W. So for eight hours sleep, you consume 800 to 1600 watt hours. Lets call it 1kwh, just for convenience. Looking around, it seems that AA batteries have somewhere between 2.4wh and 9.6wh. Lets be lazy and generous and go for 10wh. To get 1kwh from 10wh batteries, you are going to need a hundred of them to stay kind of warm for the night. If you crank your blanket up to 200W, you up your usage to 1.6kwh, and you get bog standard alkaline cells at 2.4wh each, you are going to need 666 of the little buggers. Which is not only going to get expensive, but demons will come out of your closet and get you. |
|
| |
(Those numbers are for disposable batteries, rechargables are a bit less energy dense, 1.5 to 2.7wh each.) |
|
| |
I have a non-electric wireless blanket. Heat energy is transmitted wirelessly from my central heating to the blanket, which warms up. It's very clever. |
|
| |
I have a towel that does that too. |
|
| |
Why not simply make one, very large paper battery the size of the blanket, that you recharge during your waking hours? Enough power there, you think? |
|
| |
Well, do you have figures for the energy density of these paper batteries. I could not find anything or I would have used that in my annotation. |
|
| |
On the other hand a blanket that you use once and throw away seems rather extravagant. |
|
| |
Print contemporary newspaper articles on it. |
|
| |
Normal blankets work pretty well too you know. A decent goose down sleeping bag will let you sleep like a baby in -30 centigrade. |
|
| |
I know they do. I use a faux down blanket myself. Still, an electric blanket has a certain toasty feeling that's different than trapped body heat. I never used them because the cord always bothered me. If they made them cordless, I'd use one on very cold nights, which we get here in Washington. |
|
| |
And I'm sorry, but I'm not going to use a sleeping bag in bed. Although another benefit of this idea is that you could use it while camping (which may or may not ruin the camping experience for you, depending on your preferences) or keep it folded up in an emergency kit in your trunk. |
|
| |
How about a chemical heater? I've seen
hand-warmers that contain a saturated
solution of something or other. When
you press a little metal pad, it nucleates
crystallization and the whole thing
solidifies, giving up latent heat of
crystallization. You can later heat the
thing to redissolve the stuff, and use it
all over again. |
|
| |
For a blanket, it has the disadvantages
of giving up all its heat too quickly, and
of solidifying. Maybe a slower-
crystallizing recipe, and maybe make it
crystallize into a slush rather than a
solid mass. |
|
| |
Hm.... can you really re-use those chemical heaters? I didn't know that, that's cool. |
|
| |
Alternatively, you could find someone to sleep with. |
|
| |
Yeah, cold feet on your calves is the PERFECT solution. |
|
| |
//Alternatively, you could find someone to sleep with.// |
|
| |
Oooooh! That shit is cold [nuke-dawg]! |
|
| |
//Can you really re-use those chemical
heaters?// Yes but, just to be clear, these
are the ones that work by crystallization
(so, I guess they are really physico-
chemical heaters). The self-heating cans
seem to work differently, but mixing water
with slaked lime, and I guess they are
irreversible to all intents and purposes. |
|
| |
I don't know, [MB]. The way you make slaked lime is to cook the water off, so the reaction should be reversible. Might require some disassembly though. |
|
| |
//Alternatively, you could find someone to sleep with// |
|
| |
Have you not seen my profile? |
|
| |
yeah, sorry about that - washing my cat's fleas tonight. |
|
| |
My old cat used to hate being washed... never let my wife do it, he hated her (can't say I blame him now), but he always sat still for me. |
|
| |
//The way you make slaked lime is to
cook the water off// Actually I was
wrong when I said hot-cans heated by
mixing water with slaked lime. Slaked
lime (a.k.a. calcium hydroxide) is
already hydrated (hence the name -
slaked, as in thirst). What they actually
do is to mix water with lime (a.k.a.
quicklime, or calcium oxide), which
turns it into slaked lime and produces
heat. |
|
| |
According to Wikipedia, you have to
heat slaked lime to 512°C to remove
the water, so it would be recyclable with
some difficulty. |
|
| |
There have been battery-powered socks around for years. The link shows some advances that might be applicable to battery-powered blankets. |
|
| |
If you made a crystallizing-chemical packet blanket, you might be able to recharge it in a really hot washing machine, or dryer. If you built it just right, the little activators would trigger when you started to shiver. |
|
| |