this post was submitted on 12 Jan 2024
31 points (94.3% liked)
China
1968 readers
4 users here now
Discuss anything related to China.
Community Rules:
0: Taiwan, Xizang (Tibet), Xinjiang, and Hong Kong are all part of China.
1: Don't go off topic.
2: Be Comradely.
3: Don't spread misinformation or bigotry.
讨论中国的地方。
社区规则:
零、台湾、西藏、新疆、和香港都是中国的一部分。
一、不要跑题。
二、友善对待同志。
三、不要传播谣言或偏执思想。
founded 4 years ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
It'd be very interesting to think of an hybrid system in which the betavoltaic cells are coupled with lithium batteries to give them some kind of natural regeneration over time(, a phone or computer could recover go from (50, or 20, or )0 to 100% overnight/'when it's not used')
This current model only gives 8.64 joules per day, but that's because 86400 is the number of seconds in a day, so if i divide 8.64 per 86400 i obtain 10^-4 W(, P=E/Δt), and the official/rounded number is 100μW.
Its volume is 1125mm^3 (15*15*5mm)
So, to drive 100km in an hour(, without the need to take into account accelerations for now), we'd need 100*200W=20kWh, or 2.10^4 Wh.
Most electric cars would only enable 4 hours at this rate with an 80kWh battery, but since this nuclear "battery" needs to be able to deliver 24h a day, we'd need 24 * 2.10^4 = 4,8.10^5 Wh
Hence, if we need 4,8.10^5 Wh and we have 100.10^-6 Wh for 1,125.10^3 mm^3 , a rule of three would give us 4,8.10^5 * 1,125.10^3 / 100.10^-6 mm^3 , that's 5,4.10^12 mm^3 , which is indeed 5400m^3 and not realistic.
Even a 200Wh computer would still need 54m^3 , and a 10Wh phone would need 2,7m^3 , the size of a car.
If the output was mutliplied by a thousand(, 100mW instead of 100μW,) then it'd be 2,7dm^3 , the size of a bottle and still a bit too big for a phone, but a "free" energy for 50 years, and if i'm keeping the thought above of an hybridation as a self-regenerative battery it'd refill 240Wh every day(, 24*10Wh,) but that's only if the output was multiplied by a thousand, which is unlikely.
Thank you very much for the correction, i didn't know that.
I wonder if i haven't made a mistake somewhere though, does it make sense that i'm obtaining 100μW by using seconds, and then comparing it with Wh ? If i had to multiply by 3600 before making this rule of three then that would change the conclusion.
8,64J/day would give 0,36J/h = 0,36Wh ? And would also give 100μJ/s = 100μW ?
I.d.k. anymore, but if i'm right this time then we'd need a 75cL bottle to refill 240Wh every day(, and for electric cars only 75L to refill 24kWh). I wouldn't be surprised if i made mistakes elsewhere so tell me what you think.
I don't know if you have the answer but, if i understood correctly, such 1W "battery"/generator would produce/refill 24Wh every day ?
If we put 10.000 BV100 in parallel(, to obtain 1W at the same 3V), that'd theoretically be 10 000 * 1125mm^3 = 1,125.10^7 mm^3 = 11L for 24Wh and 110L for 240Wh filled per day ? Ah well, w/e 🤷♂️. (edit : thanks for your answers though !)