/sci/ - Science & Math

[Anonymous No.3956321]

http://en.wikipedia.org/wiki/Wireless_power_transmission

>Power transmission via radio waves can be made more directional, allowing longer distance power beaming, with shorter wavelengths of electromagnetic radiation, typically in the microwave range. A rectenna may be used to convert the microwave energy back into electricity. Rectenna conversion efficiencies exceeding 95% have been realized.

>efficiencies exceeding 95% have been realized.

WAT

WHY THE HELL AREN'T WE WORKING ON A DYSON SWARM MODULE RIGHT THIS MOMENT?

You could balance a satellite in solar orbit between the solar wind and the solar gravity. Then you could just beam tapped power with a microwave laser to Earth. Radio frequencies are hardly affected at all by the atmosphere.

[Anonymous No.3956330]

>>3956321

cost

microwaves can make you boil if you get enough of them on you

solar storm will get us back to the flintstones

[Anonymous No.3956329]

Kikes won't let you get into space, since you'd be beyond their control.

[Anonymous No.3956351]

>>3956330

then

A. use something other than microwaves

B. find a way to shield them from solar storms

[Anonymous No.3956352]

>>3956321
you'd need to be really close to Carnot's efficiency cycle to get that efficiency.

[Anonymous No.3956355]

>>3956330
>cost
Regardless of what the initial investment cost will be, that satellite will just keep on beaming until you break even and long after you've made a shitload of profit.

>microwaves can make you boil if you get enough of them on you
You can focus them into a laser. Unless you aim it at someone it won't hurt anyone. Just have it track a rectenna on Earth.

>solar storm will get us back to the flintstones
While a solar flare is nasty business, we might be able to predict them and take approprate actions. Otherwise we'll just have to harden the electronics somehow.

[Anonymous No.3956371]

>>3956352
In other words you can think of my argument as of "95% is exaggeration" particularly if photovoltaics is used.

[Krakengineer !!5XY+x7grkpt No.3956410]

>>3956321
>efficiencies exceeding 95% have been realized.

Is that in a vacuum while the transmitter and receiver are supercooled and a few millimeters apart? I built a microwave power transmitter in undergrad and I find that really hard to believe. 95% efficiency is more than a really good ferrite core transformer is capable of, and a wireless power transmitter is essentially that with kilometers of air taking the place of a ferrite core. I'm skeptical of any electrical device that claims 95% efficiency, and wireless power transmission has many inherent problems with efficiency.

[Anonymous No.3956433]

>>3956321
>Then you could just beam tapped power with a microwave laser to Earth. Radio frequencies are hardly affected at all by the atmosphere.
>2011
>assuming microwave=radio waves
>ISHYGDDT
Pic related

[Anonymous No.3956461]

>>3956433
If I read this image right, It says that the atmosphere is 100% opaque to microwaves.
That means a whole shit ton of energy is gonna be lost if beamed down.

[Anonymous No.3956462]

>>3956433
>thinking microwaves aren't radiowaves
So how does it feel, realizing you just demolished your credibility?

[Krakengineer !!5XY+x7grkpt No.3956468]

>>3956352
The Carnot cycle doesn't really work in a vacuum. The only way to dump heat is through radiation, which is really poor.

[Anonymous No.3956499]

>>3956462
Your the retarded one.

microwave=/=radiowave
microwave, radiowave == electromagnetic wave

[Anonymous No.3956516]

>>3956499
rrrright

Unless the classification has changed in the last twenty years, microwaves are still radio-waves.

[Anonymous No.3956540]

>>3956499
>your

0/10, your not even trying

[Anonymous No.3956566]

>>3956499
>>3956516
So can we all agree that microwaves are a subset of radiowaves which are all just a subset of the Electro-Magnetic Spectrum?

[Anonymous No.3956574]

>>3956321
edison died, we have plenty of socialist shrills who want to work on science just because they enjoy it but no innovative capitalists to put this technology into practice so the common working man can benefit

[Anonymous No.3956577]

>>3956516
Clearly the OP was thinking of radio waves in the sense of the AM/FM band, given the notion that they travel through the atmosphere relatively unimpeded, rather than the more general definition of radio waves which does include microwaves.

[Anonymous No.3956579]

>>3956468
The "cold" part is the temperature of photovoltaic cell, the hot part is the temperature of sun. Assuming the photovoltaic cell is to be used continuously and not only 5seconds a year we can clearly see that the cells will heat up. Carnot cycle is valid everywhere as an ultimate upper ceiling for all possible heat conversions.

[Anonymous No.3956581]

>>3956566
Yes. I just took offense on him saying that microwaves aren't radio-waves.

[Anonymous No.3956672]

Bottom line of OP's question:
WE aren't building a dyson sphere because currently the only efficient power transfer is via microwaves, but since the atmosphere is highly opaque to microwaves it will just get absorbed which will produce waste heat int he atmosphere, and on large scale could induce further global warming.
Also, the amount of lost energy is a real turnoff.

[Anonymous No.3956699]

The atmosphere is nearly transparent to longer microwaves.

[Anonymous No.3956722]

>>3956699
I don't think you did that right. Check your math, instead of just copypasting/fading, because those two images are'nt to scale.

[Anonymous No.3956743]

>>3956722
Microwaves are from 10^-3 m to 10^0 m = 1mm to 1m.

[Anonymous No.3956747]

>>3956722
what are you talking about you dumbass

[Anonymous No.3956748]

>>3956722
seems right to me. the other picture wasn't to scale or lined up.