SteamyTea

First things first. An ASHP and PV are rated by power, the kW. You buy electrical energy by the kWh. As for the best tariff, hard to say. Do you know the amount of energy your ASHP has consumed, the kWhs, and what your PV has produced, kWhs again. Do you also know the shortest amount of time you can run the ASHP for to get a day's worth of energy into the house, I am assuming you have UFH in a concrete slab. What is your DHW usage.

I have never had much luck filling over foams. I think it is the greater thermal expansion rate of the foam that causes the problems.

Yes. I should have said it was per degree difference.

That would only be another 600 W.

I just quickly modelled your house as a simple cube. 12 m long, 10 m wide and 5 m high. Came out, as 292 W/°C at 1 ACH. So at a delta of 20°C, that would be 5831 W, at 23°C, 6705 W, or 6.7 kW. Have you mixed up some units somewhere i.e. metres and feet.

It does, press and hold the zero 'key', the ⁰ symbol will reveal itself.

Just to clarify something. ° is for degrees. ' is minutes, a 60th of a degree. I degree. °, is 60 minutes,'. And, just to be a pendant, 3600 seconds, which has the sign, ".

We have Arthur C Clarke to thank for that. Rendezvous with Rama

Which floor is your greatest daylight power usage going to be? If one floor is just lights, say for bedrooms/bathrooms, then usage will be so low i.e. 30 or 40 W, it is not worth worrying about.

By the looks of it you started in mm, rather than converting to m. So the answer will be in mm. And it is Phi.

The cut, considering the wall type, is probably as good as can be expected by hand.

@Oxbow16 Can you still type? We all want to know how you got on.

I think it changes the ratio by 30% if you put the pipework half way up in the concrete. This assumes equal thickness of insulation and screed. 30% sounds a lot, but it is not great, but then it does depend on the temperature differences between the pipe temperature, slab/insulation temperature and ground/air temperature, If I was not so busy I would try and calculate, been a while since I have looked at differential equations.

Interesting, is all the drug associated crime centered around the cities.

Because of the potential greater heat losses. Not considered a problem raising mesh up 50mm or so, and not considered a problem attaching UFH pipe to steel mesh. Probably not that hard to get different height posts that are suitable to attach UFH pipework to. May seem extra work and expense, but probably isn't in the scheme of things.

Yes, seems odd to me and lacking in thought.

Can glass fibre chippings be added to a concrete mix to reduce cracking? As for where the pipes go. I would say never next to the PIR, that just heats the insulation more than needed, which increases the temperature delta to the ground. The closeness to the surface is really set by the pipe spacing. So if your pipes at at 150mm spacing, then 75mm depth, 100mm spacing, 50mm depth. Depth from surface equals half pipe centre spacing.

Not many probably, and it should be highlighted to both the ARB and RIBA.

@ETC Do you, or any other architect, report back to your governing body about the perception that the ordinary public have of your profession? When I have a complaint, i.e. the recent price rise in my coffee (third this year), I say something to the manager of the place. I also ask if they report back on customer comments. If they say 'no' or 'yes, but nothing happens', I write to the complaints department and let them know that I am not a happy customer. It is not really up to an individual to take the wrath of potential customers/lost customers, without the organisation that charges you for professional membership, offering support.

Hogarth said "Whoever makes a design without knowledge of perspective will be liable to such absurdities as are shown in this frontispiece"

That is a very good point. I wonder if there is a standard was to calculate the size of A/C units. Just a case of changing the sign to make it heating (near enough).

At the moment you do need your F-Gas though.

Keep fish, if potassium permanganate don't work, flush them down the bog.

Welcome There does not seem to be that much general information about A2AHPs, a few on here have them and rate them highly. The main think about wall mounted, is about noise transmitting though the wall. The other thing is any planning restraints i.e. it is ok to have one, but not two, not at the front of the building. I do wonder why, for self install, one cannot get an ordinary monoblock ASHP, then just plumb it is to fan assisted radiators. I bet the drop in efficiency is not that bad. No messing about with F-Gas, flanging tools, vacuum pump that way, and ordinary plumbing fixtures and fittings.