Solarpunk

5497 readers

86 users here now

The space to discuss Solarpunk itself and Solarpunk related stuff that doesn't fit elsewhere.

What is Solarpunk?

Join our chat: Movim or XMPP client.

founded 2 years ago

MODERATORS

ex_06

poVoq

SteveKLord

There’s a deeper problem hiding beneath global warming - waste heat (aeon.co)

submitted 1 year ago by niartenyaw@midwest.social to c/solarpunk

12 comments fedilink hide all child comments

TL;DR

using/generating energy always emits heat as waste and there is an upper limit of efficiency that we are not that far from. if that energy was generated via something that is not a natural heat gradient for the earth's surface there is a net increase of heat in the earth system simply by generating and using energy.

a lot of energy sources fall into this: fossil fuel, nuclear, geothermal, etc. two that don't are (certain types of) solar and wind, since their energy would eventually be dissipated onto earth's surface whether we intercept or not.

that waste heat is currently estimated to be ~2% of the heating power caused by global warming, so already significant. we essentially have an upper limit on sustainable energy usage on earth (and therefore an avg per person usage) or we will have Global Warming 2: Waste Heat Boogaloo.

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

[–] niartenyaw@midwest.social 0 points 1 year ago (2 children)

turbines are still energy generation, heat is also emitted when that produced electricity is consumed.

all machines have efficiency < 1 and therefore emit heat when used. many of those machines even have the goal of producing/moving heat.

[–] Pseu@kbin.social 2 points 1 year ago* (last edited 1 year ago)

all machines have efficiency < 1 and therefore emit heat when used.

All machines produce heat equal to their energy input. They have an efficiency of 1.0 at producing heat. Some will store it in potential energy for some period, but unless that reaction was exothermic, that potential energy will itself be released and fall back to a lower energy level, usually releasing it as heat.

[–] silence7 1 points 1 year ago

Yes, but the amount of heat they're generating is by definition no more than the amount of energy in the electricity. This caps the total waste heat impact, and means that for fossil-fuel-generated-electricity, their impact on the earth's temperature is almost entirely a result of warming caused by the greenhouse gases emitted.