Notes from an eco house. (2025 Update)

Dec 28, 2024 Last reply: 1 year ago 177 Replies

Not so. With fusion, no one even has a proof of concept, never mind a working prototype. With the SMR (fission), there are plenty of small reactors in ships and subs which WORK and have for years. Meaning that an SMR for land use is only engineering.

That depends. What is happening in the West today is that people are discovering they would rather have reliable cheap energy and no potholes in the road than transgender polticians with a prick and a pussy.

Or lesser spotted asian crested newts.

Well there definitely was. I could her it humming away outside

Just for reference the entire Apollo program was "just engineering"

I did the calculations. It makes perfect sense

if electricity costs are greater than gas by a factor larger than the upcycle gain on the heatpump, a heatpump will be more expensive.

Given that gas is typically 4-6p a kWh, and electricity these days is up around 20p and the time you need heating is in the winter when the heatpump can't do 4:1 and may struggle to do 2,.5:1

There wasn't a lot. the floors were barely warm. Nevertheless his electricity costs were very high

And economics. There are economies of scale building big. It maybe that the advantages of having a smaller more agile design and deployment model outweigh the economies of scale, but I don't think it a sure thing.

Rolls Royce has been running them for over 40 years, dimwit.

The challenge is only one of production engineering

They are, up to a point.

Dont be too sure.

Cognitive dissonance is a marvelous cope.

The economies of SMR are massively affected by toiw factors. Proximity and regulation.

Proximity means that large business can build one attached to their data centres and don't need huge cables from Morocco or Scotland to bring unreliable energy in.

Regulation means that type approved factory built and tested units can be erected in months, not decades, representing a far more efficient use of less capital. And below a certain size emergency forced cooling on PWR shutdown is simply not required. The design is simpler. It needs less testing

Two fantasists in one thread…

Tim

With a big enough battery the current electricity cost may be closer to

10p/kwh off peak. However this is the ongoing running cost and doesn't take into consideration that the up-front costs are likely to be £15K more than replacing a gas boiler (ignoring grants).

A grant or subsidy does not reduce the cost. It simply shifts it elsewhere.

Only ten years to go.

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Paul

Annual electricity consumption here is 6700kWh. That's everything - ASHP heating, hot water (ASHP+immersion for legionella), cooking, dishwasher, WM, tumble dryer, electronics (of which there is quite a bit, baseload is about

150W).

Currently on Octopus Tracker the daily price averages about 20p/kWh (without messing about with time scheduling beyond doing the washing on windy days), with about 60p/day standing charge. Total for the last 12 months £1453.09. (have only been on Tracker about 10.5 months though, on standard tariff before that)

This property has never had gas so can't really compare costs with that. It's a 1960s 120m2 chalet bungalow.

Is that house enormous? Some self builds (see Grand Designs) mean somebody building a cathedral just because they can, even if they never use half the space. Then they end up with somewhere that's 400m2 and full of floor to ceiling glazing and it ends up costing a lot to heat.

Is that maintenace in terms of changing filters, or fiddling with settings?

That's the downside of allegedly 'smart' stuff. I prefer smart stuff that just works without programming.

Agreed, from r/SolarUK on Reddit current quotes seem to be about £7-10k for a solar+battery system (~5kW solar + 5-10kWh battery). Compared with putting the money in the bank I'm not clear how it works as a financial proposition, and the payback depends a lot on future electricity prices. If you don't use a lot of power to begin with, generating your own seems less attractive.

If you have an EV I think the numbers might stack up better, because now you have a battery and a big consumer of power so there are more kWh to be saved.

It would be interesting to know what their usage is like. If you go to the compare here:

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put in their postcode and then click through the screens, it tells you how much their gas and electricity annual kWh are. Can you tell us?

Theo

Name those

And that's the way the Scandinavians do it.

That's very arguable given the availability of the sea for cooling with ship and sub SMRs.

The challenge is also cooling them when it's not in a ship or sub.

Not cooling wise they aren't and particularly a sub SMR doesn't produce anything like enough power for them to be viable to power a city or even a town.

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