John Lee
@thudhead.bsky.social
Net-zero strawbale home and Tesla Model 3 owner, Southern Utah All Vehicles Electric Rally organizer, retired engineer. Sharing my EVSE on PlugShare since 2017. #electrifyeverything
Only if you say something nice about Trump first though.
April 18, 2025 at 2:10 PM
Only if you say something nice about Trump first though.
It will be great for oligarchs though.
April 14, 2025 at 2:50 PM
It will be great for oligarchs though.
I’m trying to imagine exactly who it would be that would think that reshoring combustion car manufacturing was good business.
March 30, 2025 at 2:16 AM
I’m trying to imagine exactly who it would be that would think that reshoring combustion car manufacturing was good business.
It seems a tariff on car buyin might chill the drillin.
March 30, 2025 at 2:09 AM
It seems a tariff on car buyin might chill the drillin.
I’m not interested in owning a combustion vehicle.
March 28, 2025 at 1:54 AM
I’m not interested in owning a combustion vehicle.
Neither I nor my spouse have tested positive.
We still mask on public transit.
We are on public transit right now.
We still mask on public transit.
We are on public transit right now.
February 24, 2025 at 6:38 PM
Neither I nor my spouse have tested positive.
We still mask on public transit.
We are on public transit right now.
We still mask on public transit.
We are on public transit right now.
What did she do, sign up for a bluesky account?
February 21, 2025 at 3:57 AM
What did she do, sign up for a bluesky account?
A price worth paying.
February 18, 2025 at 7:09 PM
A price worth paying.
The Tesla V3 supercharger is only 5 miles away.
February 17, 2025 at 4:18 PM
The Tesla V3 supercharger is only 5 miles away.
This is a dead mushroom.
February 15, 2025 at 9:28 PM
This is a dead mushroom.
Do they provide access to a mushroom treehouse?
February 13, 2025 at 2:56 PM
Do they provide access to a mushroom treehouse?
(Watt*hr, not Watt/hr)
February 10, 2025 at 2:34 PM
(Watt*hr, not Watt/hr)
Kinda like how DJT keeps telling that snake story.
February 10, 2025 at 2:22 PM
Kinda like how DJT keeps telling that snake story.
Credit card fees don’t look so bad now.
February 10, 2025 at 2:09 PM
Credit card fees don’t look so bad now.
600 quadrillion BTU of fossil fuel use per year in the world
x 0.6 = ~360 quadrillion BTU of waste heat
/ 510,000,000,000,000 m^2 = 705 BTU/m^2
/ 365 days per year is 1.93BTU per square meter/day
/ 24 hours per day is 0.08 BTU/hour per m^2
/ 3.41 watt/hr per BTU = 0.02 watts/m^2
x 0.6 = ~360 quadrillion BTU of waste heat
/ 510,000,000,000,000 m^2 = 705 BTU/m^2
/ 365 days per year is 1.93BTU per square meter/day
/ 24 hours per day is 0.08 BTU/hour per m^2
/ 3.41 watt/hr per BTU = 0.02 watts/m^2
February 10, 2025 at 1:34 PM
Expressing primary energy from fossil fuels in Wh uses the ‘substitution method’, backing out the waste heat to estimate energy services, not BTUs.
I used world BTU consumption and a rough 60% waste heat assumption to estimate a forcing function for waste heat.
I used world BTU consumption and a rough 60% waste heat assumption to estimate a forcing function for waste heat.
February 10, 2025 at 1:04 PM
Expressing primary energy from fossil fuels in Wh uses the ‘substitution method’, backing out the waste heat to estimate energy services, not BTUs.
I used world BTU consumption and a rough 60% waste heat assumption to estimate a forcing function for waste heat.
I used world BTU consumption and a rough 60% waste heat assumption to estimate a forcing function for waste heat.
So I did a back of the envelope calculation to estimate the global warming forcing function of waste heat produced by burning stuff either for mechanical work, or even just for warmth.
0.02W/m^2
I wonder if someone has calculated this rigorously rather than my back of the envelope approach.
0.02W/m^2
I wonder if someone has calculated this rigorously rather than my back of the envelope approach.
February 10, 2025 at 12:48 PM
So I did a back of the envelope calculation to estimate the global warming forcing function of waste heat produced by burning stuff either for mechanical work, or even just for warmth.
0.02W/m^2
I wonder if someone has calculated this rigorously rather than my back of the envelope approach.
0.02W/m^2
I wonder if someone has calculated this rigorously rather than my back of the envelope approach.
By replacing combustion engines with electric motors and using heat pumps we can avoid the production of both heat trapping greenhouse gasses and waste heat.
February 10, 2025 at 12:42 PM
By replacing combustion engines with electric motors and using heat pumps we can avoid the production of both heat trapping greenhouse gasses and waste heat.
Now that we are increasingly getting our energy from renewable sources, we need to look at the Carnot cycle not as a limit for efficiency, but as a way to move heat to where we want it.
February 10, 2025 at 12:35 PM
Now that we are increasingly getting our energy from renewable sources, we need to look at the Carnot cycle not as a limit for efficiency, but as a way to move heat to where we want it.