greengnu
@greengnu@slrpnk.net
- Comment on Games that stuck with you 4 months ago:
Warzone 2100 (you can download for free as it is an old PC game that went GPL)
gets more on the nose by the day
- Comment on Is THIS your next NAS? (Zima Blade Review) 10 months ago:
checksums at the filesystem level does nothing to protect against memory corruption which can overwrite everything on your disk with null values and a matching checksum; fail to write anything to disk and/or do nothing.
But that is the gamble you take every day with every GB of RAM you have.
- Comment on What is the Small Web? 1 year ago:
the correct answer is Gemini or gopher.
- Comment on Is THIS your next NAS? (Zima Blade Review) 1 year ago:
No ECC, absolutely worthless for a NAS if you care about your data.
- Comment on How to Produce Green Hydrogen for $1/kg 1 year ago:
Sounds like they didn’t consider appealing to UK government to get subsidized liquid CO2 and use the produced hydrogen to synthetically create hydrocarbons (which are much easier/cheaper to store) and win political points doing so.
- Comment on How to Produce Green Hydrogen for $1/kg 1 year ago:
You are right in regards to very rural bus routes not being viable for electric buses but inside suburbs, cities and rural regions where the electric grid is already connected and in place, it is very cost effective to convert to pure electric.
But for rural bus routes away from a connected electrical grid, hydrogen is not a solution either as it is only 30% efficient (assuming only ideal conditions) and would be better served by liquid hydrocarbons. (I see no reason to deprive developing communities from the most efficient options)
I am in no way suggesting one would need to leave their family but one needs to understand up until the invention of the airplane, such relocation had to mean saying good bye and corresponding via mail or very rare train rides to visit with the whole family.
Green hydrogen outside of chemical processes (where it is actually useful) is a myth designed to keep the automotive industry alive past its expiration date.
The function of green hydrogen as an energy storage medium is better serviced by more custom chemistries as we are taking external energy to produce it (literally it would be the same as us taking CO2 + H2O + energy to produce gasoline [which we could do at the cost of $3.75/gal (if one ignores the CO2 collection costs)] using the Fischer-Tropsch process)
So skip the dream and accept the reality that if we are needing stored energy for transportation, it is more efficient to store it as liquid hydrocarbons. But if we need to store for transient demands, batteries and flywheels are better solutions.
- Comment on How to Produce Green Hydrogen for $1/kg 1 year ago:
completely fair perspective, if you are required to travel large distances outside of cities then liquid fuels would be the superior option.
But if cities are linked by high speed rail and effective bus coverage; there would be no need for a car to visit someone. #fuckcars
I do agree that batteries are not a good solution for planes but I believe plane use should be only for special cases that are extremely time sensitive (like organ transplant transportation) and are of high social benefit (which could justify carbon fuel usage)
One doesn’t need batteries or combustion in heavy transport as fixed lines can just use electric wires which saves on moving weight and would make such transport more efficient that any carried fuel source.
- Comment on How to Produce Green Hydrogen for $1/kg 1 year ago:
quick refueling only matters if your travel distance exceeds your battery’s range (which for 95% of driving is less than 100 miles) I would agree on the weight issue only if you don’t engineer the hydrogen storage to properly survive car crashes. Range is of no practical use if it vastly exceeds your needs.
I find trains better for heavy transport and fixed route power lines would cover that problem in a more efficient manner.
Hydrogen would take double conversion loses if used like a battery and a flywheel would be more efficient at storing renewable energy at a grid level.
Off-grid energy storage can be done in heavy weight battery chemistries which can last forever without the maintenance cost that must occur with combustion. (heck even Nickel–iron batteries from 1901 would work)
I will grant you that hydrogen has many useful and wonderful applications.
Home energy storage and transportation are not one of them.
- Comment on How to Produce Green Hydrogen for $1/kg 1 year ago:
You forgot to read the section on hydrogen storage, infrastructure and safety problems.
But I guess you are correct that we are from an engineering perspective able to make hydrogen powered cars but I would argue that it combustion is not a good solution to transportation when proper infrastructure would be able to do without those risks.
- Comment on How to Produce Green Hydrogen for $1/kg 1 year ago:
Actually you would never want hydrogen powered cars from an engineering perspective.
Ideally this would only be producing hydrogen for chemical processes which require a hydrogen feed stock.
- Submitted 1 year ago to energy@slrpnk.net | 22 comments
- Comment on Is energy access a human right? 1 year ago:
Energy in the technical sense has always been a human right as we would literally die without it (ATP production kind of requires it and sunlight tends to power food production too)
If by energy you mean electricity or chemical energy in convenient containers (like butane canisters) then no but improving access would extend lives and reduce the total environmental pollution if done properly. As there is not an upper bound on how much every one could claim they need and lack of access to energy efficient options would make the lower bound insufficient for most people to live off.
- Comment on Need to get off the grid fast. Is a gas or diesel generator my best option? 1 year ago:
Skip the batteries for now, get a few solar panels and an inverter. Skip depending on a fridge until you can get batteries in. But more details about your must haves, want to haves and nice extras would enable more exacting calculations.
Details on basic setup can be found here: anarchosolarpunk.substack.com/p/offgridsolar
- Comment on Rutgers University is still a trailblazer in parking lot solar 1 year ago:
It is trailblazing to replicate what other universities have done 25+ years ago? how odd
- Comment on Game-changing invention converts both CO2 and plastic waste into renewable energy 1 year ago:
No.
The chemistry required is energy intensive (aka using energy from an external source) and not very efficient (ultimately making the problem worse)