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WillP

@wiilp.bsky.social

Energy, science, engineering, environment.

245 Followers  |  198 Following  |  2,402 Posts  |  Joined: 07.11.2024
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Posts by WillP (@wiilp.bsky.social)

How quickly should we expect supermarket prices to go up?

Seem to remember in 21/22 they were pretty exposed to logistics costs

05.03.2026 09:29 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

bsky.app/profile/soci...

Top notch trolling here by the engineers of their frenemy, the architects

04.03.2026 17:12 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

Yes!
1kW EAHP CoP3 cools the air by 3deg, needs airflow =

1kJ/s Γ· (3deg * 1.2 kJ/mΒ³deg) * (CoP-1)/CoP * 3600s/h

= 670 mΒ³/h

For 10W/mΒ² => 100mΒ² floor area x 2.5m ceiling

=> 2.7 air change/hour

bit too high? EAHP preferably much smaller w/ ohmic supplement.

Ventilation is best continuous?

04.03.2026 13:30 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

The discount is how EU rents GB's infrastructure, which receives LNG in Wales and Norwegian pipelines in Scotland and sends gas on to EU from Norfolk?

That's not changing, but in the short term EU has more storage than GB, so GB is more exposed. In med term EU will need to refill said storage?

04.03.2026 11:49 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

I have a soft spot for Exhaust Air heatpumps because they recover the 50% of exhaust air heat that is in the form of latent heat, which "high efficiency" MHRVs cannot touch, and so ignore.

But market experience in UK has not been receptive, seems over-ventilation needed to generate enough DHW.

04.03.2026 11:33 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 2    πŸ“Œ 0

"All caßh is fictional, virtual, and entirely made up, much like Deutsche Bahn's timetable"

"By creating an account, you have moved to Schleswig-Holstein. Your new postal code is 24103. You now speak rudimentary Danish.

We are not accepting appeals at this time."

Love it! πŸ˜‚πŸ˜‚πŸ˜‚

bahn.bet/about

04.03.2026 11:22 β€” πŸ‘ 6    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
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Think the hwy code changed on this recently, but still widely ignored

"At a junction you should give way to pedestrians crossing or waiting to cross a road into which or from which you are turning"

www.gov.uk/government/n...

03.03.2026 17:22 β€” πŸ‘ 12    πŸ” 1    πŸ’¬ 3    πŸ“Œ 0

Also the above is through a lense of 20thC economic/political rationalism.

Carney's speech said that's all bunk now, it's now about who has power to kick whom the hardest.

03.03.2026 13:02 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Agree, but

a) not sure how much difference 18bcfd would make to voting intentions (would have to have a massive/immediate effect on US inflation to get noticed enough in time)

vs

b) crashing euro+seasia economies would also affect US inflation

03.03.2026 13:02 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

Isn't the US stated strategy to have "Energy Dominance" by holding the coercive threat over EU that they might turn off the taps?

Holding that card is more powerful than actually playing it?

03.03.2026 12:03 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 2    πŸ“Œ 0

(not referring to commentary from Dan, to be clear!)

03.03.2026 09:29 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Mmm those Octopus graphs are for overnight wind (for IOG tariff). They don't include solar - 7GW today plus imports - and don't factor in demand - much less today than in January.

We've seen 40p+ on similar days last months, but not 50p+

03.03.2026 09:03 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 2    πŸ“Œ 0

Have noticed lots of commentary that :

"most products from the Gulf go to Asia"

and in the same breath

"if US cut off our LNG supply we'd just buy from somewhere else"

These cannot both be true

Disruption to globally traded and globally priced commodities, hits everyone who buys them.

03.03.2026 08:50 β€” πŸ‘ 4    πŸ” 1    πŸ’¬ 1    πŸ“Œ 0
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That was quick

02.03.2026 19:33 β€” πŸ‘ 0    πŸ” 1    πŸ’¬ 2    πŸ“Œ 0

Mind out for all those battery sounds though πŸ˜‚

02.03.2026 14:53 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 2    πŸ“Œ 0
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Europe/UK energy prices gone up +50% so far this morning

I wrote this reply and had to redo it as prices went up by another 5% while I was typing

02.03.2026 12:57 β€” πŸ‘ 6    πŸ” 2    πŸ’¬ 1    πŸ“Œ 1

Yes that is a lot of power to take from the grid

The whole of Scotland only consumes around 2500 MW total

The Torness nuclear power station produces around 600MW per reactor

02.03.2026 12:16 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Would be interested in how this categorisation works in US?

In UK there is a list of nationally-important consumers who shouldn't be load shed, but including: oil refineries, airports, some banks, some military bases.

However the Heathrow blackout incident exposed this is not working very well.

01.03.2026 21:19 β€” πŸ‘ 2    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0

One kJ of electricity can be converted to 10 kJ of space heating and vv (said Carnot) but Sankey diagrams show them as 1:1 equivalent.

Next step should be to plot Sankeys on a scale of "what could I have usefully done with this energy?"

Could call that entropy but that might scare people!

01.03.2026 13:27 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Well, my friends with EVs but no driveways tend to charge at work (private) or at the gym (private) or at the pub (private) or at the supermarket (public).

So there will be plenty of market for both private and public chargers, but we don't need a direct replacement of all petrol pump capacity.

01.03.2026 09:47 β€” πŸ‘ 5    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

The majority of EVs are charged at private chargers, whereas virtually all petrol cars are fuelled at public petrol pumps. So we don't need parity between public chargers and pumps.

There are now around 1.1m chargers (private+public) so coincidentally that is close to 18x the number of pumps!

01.03.2026 09:06 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
Preview
Wales launches first hydrogen vs electric refuse truck trial Yesterday (Thursday 26 February) Wales unveiled its first comparative demonstration of hydrogen and electric refuse collection vehicles (RCVs), marking a major milestone in the nation’s ambition to ac...

Slightly related: a central government organising councils

www.wales247.co.uk/wales-launch...

28.02.2026 19:23 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

The hydrogen buses are/were legally owned by the City Council, not by First Bus.

The city council will sell them, maybe First Bus will buy and convert them.

28.02.2026 17:11 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Preview
NewPower secures first order from First Bus just weeks after launch NewPower – a bold enterprise from Wrightbus that converts diesel buses into zero-emission electric vehicles – has received its first order from one of the UK’s largest bus operators - First Bus, that ...

Aberdeen also has an electric bus fleet, a number of those are diesel buses that have been converted ('repowered').

Aberdeen is the head office of the First bus group (which grew out of Grampian Transport!) so there are quite a few trial/novelty things there

wrightbus.com/en-gb/NewPow...

28.02.2026 17:07 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
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Aberdeen had its own previous hydrogen bus trial 2013-2019 that seemed quite successful at the time and would have been fresh in the mind of the bus operator, they had kept the buses running after the trial.

By 2020 the rapidly improving EV bus alternative should have been visible to them though.

28.02.2026 16:25 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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At the same event they announced 1900 new electric buses, to add to the 2200 existing ones in that programme.

28.02.2026 14:22 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
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Think it was supposed to be a research project funded by the EU, wasn't supposed to be stand-alone economic on its own merits. There were diesel-hybrid and electric buses too, and hydrogen road sweepers and the like.

Should have stopped when the funding ran out.

cordis.europa.eu/docs/results...

28.02.2026 11:20 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

I remember riding the original Aberdeen single decker hydrogen buses about 2015, they were widely seen as forward looking and successful at that time. (The refueling electrolyser worked then too!)

Sometime later, EV buses came onto the market and have rapidly 'overtaken' the H2 buses.

27.02.2026 20:52 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

Not really my area, but I understand that the issue with electricity distribution is evening EV charging - the power draw of a heatpump is much less than an EV charger. CCC wrote about this iirc.

Conversely, if heatpumps and EV chargers can timeshift load in a smart way it actually helps the grid.

26.02.2026 17:50 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

Computer Aided Design software including Finite Element Modelling

This allows us to build everything lighter thinner and more efficiently than we used to - bridges, aircraft, cars, tin cans - so use less fuel and materials.

26.02.2026 13:29 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0