SteamyTea

From my comic a few weeks back. HOME HEATING Many uses for hydrogen are mooted, but some are far from guaranteed to materialise. One is decarbonising home heating, with proponents arguing that countries, including the UK, could repurpose existing gas pipe networks to carry hydrogen and swap natural gas boilers for ones capable of burning hydrogen. Leeds in the UK has been mooted as an early candidate for switching entirely to hydrogen instead of natural gas for heating and cooking, with a 2016 report by the local energy network finding the idea “technically possible and economically viable”. In November, the UK government said it would support a village-scale hydrogen heating trial by 2025. Sceptics say it would be more efficient to use renewable electricity directly with heat pumps to warm homes, rather than losing energy by converting it to hydrogen first. A recent report by Jan Rosenow and a team at the UK Energy Research Centre concluded that there is so much uncertainty about hydrogen’s role in decarbonising heat that other options should be the UK’s priority in the next decade. These include networks that pipe heat to many homes from a large, central source such as an industrial plant, energy efficiency improvements and heat pumps.

Wow, a piece if kit you can't get fuel for. Unless you want to pay £10/kg for it.

Or Yea, though I walk through the valley of the shadow of death, I will fear no evil: for thou art with me; thy rod and thy staff they comfort me. Thou preparest a table before me in the presence of mine enemies: thou anointest my head with oil; my cup runneth over. or

Yes, fit the 3P now. You will loose a bigger difference in timber offcuts and dropped screws during the build. And if you like making things in a workshop, 3P machines are cheaper.

KFP With fried green tomatoes at the whistlestop cafe.

Made a little one earlier.

So nothing really changed then, so what did you use in the old place? You could replace some radiators with skirting radiators.

Probably not going to happen, it is very mature technology. You should be doing that anyway, but think of it as energy usage, rather than gas usage.

Do you know how much hot water you currently use? It is not hard to measure it.

Will you be trying to improve the airtightness at the same time? Depending on house layout and heat load, have a look at Air to Air Heat Pumps. What are you doing about DHW heating i.e. stored HW or instantaneous (like a combi).

These are the two, Jim and Barry, that blew me away in the 1970's

Hope they shave

Are these your invisible friends.

I don't see why not if the compression strength is enough. A quick interweb search throws up 0.5 MPa for Foamglas. Brick seems to be between 0.28 and 2.8 MPa. There is more to it than just compressive strength. Thermal expansion and failure modes spring to mind. I do like the idea of making a house out of it because the thermal properties are so good. 0.038 to 0.055 W/m.K for foam glass, and 0.15 to 1.6 W/m.K for brick.

That is an interesting question. I think someone, over at the other place, looked into the marginal embodied energy and CO2 differences between insulation types, and seem to remember that someone on here did something similar between wall types. You can get decent raw data from Bath Universities' ICE database.

I think that is a dangerous assumption. Did they know the amount of insulation under the slab? Did they know your actual DHW needs? Did they use local weather profiles? Did they take into account thermal gain? Did you see a room by room heat load model? Usually (what we did) we just used the appropriate building standards for when the house was built.

I was going to pay you £1500 to do the job.

I think the main decision should be made on the availability of local skills. If there are no bricklayers in your area, then don't get bricks.

Isn't that like saying 'I recommend a Ford Kuga', but not specifying which trim level, year of manufacture, limitations and price.

As long as you fit a gas combi heating and DHW system.

I have got used to the rasping feeling. Like tomatoes, I quite like it now. (I stopped wearing underwear as a new year resolution back in 2010, and have saved literally a few kWh of marginal energy since)

Because it will be done drekly

Only the visible ones. If the inside of the outer leaf, or the outside of the inner leaf is parged, that cannot be checked. Nor am I, why I asked the question about people getting follow up air tests. Know the answer anyway, it is why we don't have true airtightness figures.

Are you creating a false correlation between HP size and price. There is more to a proper installation that just the maximum output. Thermodynamics is not exactly new, it is the same formulas that govern it all, and at the domestic heating level, not even complicated ones. How many people on here have read Without Hot Air, which is free and explains most of the issues, then moved on to something like this.

Part 2. There is pretty good data here if you fancy playing with a spreadsheet. https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/946419/Sub_national_electricity_consumption_statistics_2005-2019.xlsx