Hacker News

1323 readers

321 users here now

Posts from the RSS Feed of HackerNews.

The feed sometimes contains ads and posts that have been removed by the mod team at HN.

founded 8 months ago

MODERATORS

patrick@lemmy.bestiver.se

rssbot@lemmy.bestiver.se

-5

A cheat sheet for why using ChatGPT is not bad for the environment (simonwillison.net)

submitted 1 week ago by rssbot@lemmy.bestiver.se to c/hackernews@lemmy.bestiver.se

4 comments fedilink hide all child comments

Comments

you are viewing a single comment's thread
view the rest of the comments

[–] sneezycat@sopuli.xyz 7 points 1 week ago (2 children)

If you want to prompt ChatGPT 40 times, you can just stop your shower 1 second early. [...]

Notably, Andy's calculations here are all based on the widely circulated higher-end estimate that each ChatGPT prompt uses 3 Wh of energy.

So, 1s of shower is supposed to be 40*3Wh, or 120Wh? That's, what, a 432000W heater? I'm not running a small nuclear power plant to shower in the morning.

[–] cx40@programming.dev 3 points 1 week ago* (last edited 1 week ago) (1 children)

Specific heat capacity of water: 4.184J/(gC)
Average shower temperature: 37C
Cold tap water temperature: T
Shower head output: 2gallon/min = 7.57L/60s = 126ml/s = 126g/s

1s * (126g/s) * (4.184J/(gC)) * (37C - T) = 524J/C * (37C - T)

120Wh = 432000J

T = -787C

So I guess the math checks out if your city's water supply temperature is way below absolute zero.

Scratch that, let's assume the water actually flows, so T=0C. What water throughout do we need to achieve this level of power consumption?

1s * (X g/s) * (4.184J/(gC)) * (37C) = 432000J

X = 2791g/s = 44gpm

You would have to be showering with 17 showerheads simultaneously using showerheads that are rated at the highest legal flow rates in the US (2.5gpm).

[–] stevestevesteve@lemmy.world 1 points 1 week ago

What, you don't shower with 800C steam?