5 ms·
0.12W per sqM for an intuitive sense, it would take 125 hours to charge a standard phone with 1 sqM device
by ddalex 8y ago
0.12W per sqM
for an intuitive sense, it would take 125 hours to charge a standard phone with 1 sqM device
- pfortuny 8y agoRight. But (I am an ignorant, sorry), how much wifi power can you get for how long? Thanks.
- tgtweak 8y agoThis could potentially power a low power beacon every so often. It doesn't seem practical for IOT wearables or for anything industrial at that power density. I'd be curious about the cost, in particular what manufacturing process size can be used for this. 1cm² of wafer can still be quite pricey at .000012 watts. 5°C Delta T generation is pretty impressive though. There are some commercial systems that can operate with 60°C temperature Delta (organic rankine cycle) and recover about 12% of that energy.
- namibj 8y agoThey'd need to adapt to something like aluminium foil or UHMWPE film (made like paper from the fiber-spinning solution) as a base and coat that with poly-Si. Even if it is only half as efficient, it should be a lot cheaper and possibly strong enough to be laminated into fabric like e.g. Gore-Tex membranes (extruded microporous PTFE film). A reverse electric blanket would be fancy...
- gus_massa 8y agoThe total power of the signal of a wifi router is around 2W. (Should I multiply it by x2 or x3 to power the internal system, the blinking leds, heat loss, ...?) For 2W you need ~20m² (~200sqft). That is the size of two rooms. Probably using the surface of your whole roof you can get 4W or 5W.
- lostlogin 8y agoYes, but that’s for a 5°C difference. It isn’t clear if that changes with larger differences.
- pfortuny 8y agoThanks a lot. No IoT with this yet, then...
- birdman3131 8y agohttps://www.thingsquare.com/blog/articles/sensortag-power/ https://www.thingsquare.com/blog/articles/sensortag-power/ You would be suprised what you can pull off with wireless sensors. These people pulled off 1 year with a 2032 battery.
- pjc50 8y agoBy the sounds of it this is intended for use with things like Zigbee or LoRAWAN.
- tomtimtall 8y agoOr in other words it would be possible to continually power an iPhone with the temperature difference and area available in a tent. I think the context is important to whether this is presented as something negilable or something useful. Though there is absolutely no doubt that we aren’t going to see extreme amounts of power from this in tiny devices.
- taneq 8y agoIt also depends hugely on the nature of the generator - if it's a flexible sheet which can be used to make a tent, then awesome. If it's a rigid sheet then you'd be far better off making your tent out of solar panels even if they only saw an hour a day of sunlight.
- tomtimtall 8y agoThey are not mutually exclusive though. And your tent would tend to have a higher temperature gradient during the night when there’s no sun.
- deleted 8y ago[deleted]
- cornholio 8y agoA 2 cubic meter tent has a surface area on the order of 10 square meter. The temperature differential can easily exceed 10 kelvin during a cold night, else your face will freeze off. So the potential for the application you cite is whole watts of power, enough to recharge a phone or a lantern overnight. (though, at current silicon fabrication costs, the price would be prohibitive)
- deleted 8y ago[deleted]
- AtlasBarfed 8y agoSo photovoltaics from the sun + waste heat is used by this on the backside. If cheap enough.
- fredley 8y agoFor the lowest-possible power wireless transmitter and camera (black and white, VGA), how big an area would you require then?
- Faaak 8y agoor 1000x less than a conventional photovoltaic technology