SteamyTea

My view is that a buffer would always be designed in with a heat pump system.

https://en.wikipedia.org/wiki/Self-cleaning_glass Or get a Latvian in, the guy that does my neighbours is excellent.

Generally it is the proportion of fillers that reduce shrinkage in PU foams. We used to add on 3% for shrinkage when moulding cushions and dashboards. But it was also affected by ambient conditions when moulding, tool temperature, raw material stock temperature. I have always been concerned about shrinkage with SIPs. Seen panels that are bowed at a show and when I questioned the salesperson, he just shrugged.

Be here somewhere. https://revisionscience.com/gcse-revision/physics/physics-gcse-past-papers/aqa-gcse-physics-past-papers

They are just A2AHPs, so the pull the energy our the air, cool it a bit then expell it to outside. Once you have a tank of hot water, you can do what you like with that, use it as DHW, pipe it into a radiator, plumb in an W2A heat exchanger and pre heat the air coming into the house.

My cheap Acer laptop pulls a maximum of 30W. Most if the time it is just idling with the screen asleep. A few years back I put an energy monitor in it and was really amazed how little it used.

Something like this. Pull the air our if the hot parts with a bit of creative ducting. https://www.directheatingsupplies.co.uk/vaillant-200l-heat-pump-cylinder-20235272

That is enough to heat my whole house. My PC uses 8W

Do you know the actual make up of the walls. I doubt if it is actually 2 foot of solid stone. This may be helpful if you have access. https://www.sciencedirect.com/science/article/abs/pii/S0013795209001434 Air, atmosphere (gas) 0.0262 W.m-1.K-1 Ground or soil, dry area 0.5 W.m-1.K-1 Granite1.7 - 4.0 W.m-1.K-1 Just need to take a stab at what the wall is made from.

Warm up water, or bricks. You get extra energy from the fusion phase, a lot more energy for no change in temperature.

How about ducting in an exhaust air heat pump, then doing something useful with the energy. I wonder if a relatively cheap dehumidifier could be useful.

Have you looked at this document or a newer scotch one. BR_443_(2006_Edition) (1).pdf

Did for me. Here is a 2017 paper. Covers just about everything you need. AQA-PH1FP-QP-JUN17_(1).pdf

Maths and physics GCSE, the full skill set to do a proper heat calculation is covered in those two. Or we could have a £37bn government app.

No, that tastes like Annie Lennox. Or toothpaste.

The will both brown your sausage, and make it taste like, um, earthy.

Find out the minimum volume the ASHP can operate with, then double it. You can work out an optimal volume from the power output of the ASHP, al the temperature differences, run times etc. Or just double the minimum volume. I think there is little difference in performance between a 2 or 4 port buffer/volumiser. Just down to easy of plumbing in for the given design.

Here is a comment from the article, sums it up. Fresh Air , Bristol, United Kingdom, 3 hours ago Clearly their system was poorly designed. If heat pump technology is as bad as they say it simply wouldn't exist. Using heat pumps we can reduce our heating energy demand by 75%. I've worked on 100's of successful installs. We need more qualified engineers in the country. End of. They work.

Welcome I am no expert, but take an interest in all things ASHP. Sounds to me that there may not be much volume in the pipework, so the heat pump quickly heats fluid in there, compares flow and return temperatures, sees little difference and shuts down. So our initial diagnostic seems correct. How large is the buffer tank, if there is one? I am assuming it heats the DHW no problem.

Not much. It vastly improved when I lived there.

Mine are probably already double.

Me to. I am just down the road from you at the moment.

Basically down to the poor efficiencies. You will put in more energy than you get out.

Only because you like her views that we don't have to change anything. She is rather on the fringes of climate science and was more a specialist in weather and modeling satellite data. I am more than happy to take the consensus view, but think that the Earth Sensitivity number is on the lower side. Just having an overall rise everywhere, of 2⁰C would not be so bad, that could be managed. Trouble is, the climate does not work evenly like that. There are wild swings, which we are seeing already. They are currently not greatly affecting the developed world, but the are certainly affecting parts of the development world. It is the rate of change that is the problem, it is way too fast for humans to adapt to. By adapt, I really mean move and rebuild agriculture, dwellings, and national infrastructure. Changing to a zero carbon economy is the cheapest option.