JohnMo

That's a long design life for industrial equipment. Nuclear design life's for equipment is generally way shorter than the same piece of equipment in general industry and it's maintained multiple more times frequently. Think the issue with nuclear plant design is the reaction containment and it's certification. The balance of plant i.e. Pressure vessels, steam turbines, water pumps, piping etc will be overhauled and recertified many time in 30 years plus, with the pressure containing parts regularly recertified, following inspecting for cracks, material loss and wear etc.

Suppose depends if you call it PV or black glass fence panels. And how you interpret permitted development rules on area for a ground array, is it ground area or panel area. 16m x 35mm isn't much ground area. Do it in bifacial panels, so it looks pretty (black glass) both sides rather than black glass one side and white plastic the other.

That's good to know👍

Well done @RedRhino @SimonD PV vertical panel fence, or ground mount. Vertical great winter performance at the cost of a small hit in summer in ultimate production, opposite true for ground mount. DIY install, apply for export via octopus - no MCS in site, or needed. Only issue is panels have doubled in cost over the last 3 months. But still cheaper than a fence panel.

Not really sure you need to be that complicated.

I would look at coanda supply and extract terminals, they will push air across the ceiling/room, and extract will suck air across the room, so makes placement way easier and duct runs way easier. Brink-Multi-Air-Supply-systeem-Leaflet_4388762584830.pdf You can do something like this also, so you are basically supplying air to central location and only extracting from wet rooms

Once you get descaled I would be taking care of the full water and chemical dosing. I filled mine following VDI2035 spec, but later added inhibitor and biocide. The parts I used were on the whole pretty cheap, have read-through of the below thread.

Is the plan to make it airtight - if not don't bother with MVHR. You could instead install a demand based MEV or dMEV system, which responds to humidity with automatic fan speed regulation and trickle vents that open and close to room humidity. I would be doing that even if I was going airtight! Super simple, limited heat losses, cheap enough to do.

Aren't gabions free draining - isn't that one the points of a gabion? I would ask your designer what the perforated pipe brings to the party?

UK government is the majority stake holder with 45% ownership and £14+ billion stake in it. Government money comes from taxes. The UK government funds its 44.9% stake in Sizewell C through a combination of direct taxpayer-funded capital allocations and sovereign-backed financial instruments. So level playing field Never said and never thought renewables are an only solution - but add battery storage, hydro storage, hydrogen generation from excess spinning reserve all help. Hydrogen going to hydrogen gas powered combined cycle turbine generators for background load and or gap filling.

Yes but offshore wind is pretty reliable, seems to generate power most the time. It's dead still here currently - no wind, but the current energy mix is wind and solar, in NE Scotland

Who do you think pays for nuclear? Then managed for the next 1000 years post decommissioning - the tax payer

If you do battery powered stick with one brand so batteries can be swapped tools. Brands mentioned above are all good. But get a drill for drilling and a proper impact driver for screws and bolts, makes life so much better. Impact driver doing screws is a world of difference from a drill doing screws.

Only one useful post above, that's to get a structural engineer. Changes to original plans, adds complexity, things like this needs structural engineer input and design. Making it up with a bunch helpful strangers, isn't the correct way to do it in all seriousness.

Take life less seriously - really wasn't meant to be helpful - just popped into my head reading the post

Build single storey - none of these headaches!

I would be surprised if the savings were that low. We have 200m² house, MVHR, ASHP etc. We still managed to get through 900kWh+ in April. But our bill was £25 (came through today), so saved around £200 in April alone, with Cosy, PV, battery and export compared to standard rate electric. Similarly in Jan with almost zero solar, the battery allowed almost all electric to be 12p cheaper than standard rate, so we saved £200 that month also. Without working each month out, that is closer to £2200 saving a year not £220. A factor of 10 difference, for the better

I would just add your manifold, leave the pipe tails long and mount manifold on a convenient place. Leave pressurised and you can see the pipe integrity via a pressure gauge pressure test with water glycol or air.

So is this an inverter that will run in Island mode, most don't

100mm Cheap slots, 1pm (cheap plus solar likely) and between 4am and 7am only. Heat to approx 50 degs. Have around 9kW in different directions can produce around 6.5kW at lunch time. But export is gagged at 3.6kW. Use battery to make best use of solar so as little clipping happens as possible. Did some back to back testing, and found there was very little in it, in real life. Found heat pump start doing DHW heating earlier than really needed, so you end up heat the pipe runs to cylinder the cylinder gets steered up the thermal currents etc. immersion just dies what it needs too. I would go 5kW inverter, we have 6kW and zero issue really taking in expensive tariff The spreadsheet from Jeremy Harris, on here is pretty good easy to input.

Oh well someone is taking the piss out of you. It isn't me, by the way. 4kW Haier ASHP less than £2k (no vat if new build) 7kW just over £2k. Your heating system is the same (or should be on a new build). Dump the grant do DHW via a direct UVC - £500 plus some very basic plumbing. We had 5 degs overnight and heating came on, delivered a nice sound CoP of 6.3 and I only pay 10p per kWh (Cosy). So 1.5p per kWh. Just annoying everyone just seems to get reamed by grant harvesters.

I would hate that, that's what a utility room is for. But like sticking your shower in the utility - you just wouldn't. But everyone to their own.

Either connection can be self trenched - which exactly what we did, saved a small fortune. But do you really need gas? I was convinced I did when I built, but ASHP was/is so much cheaper to run. £3500 will buy you a heat pump and have change.

Airtight - think about how you will implement with your build method. Airtightness tape, we don't have any in our build. We do have airtight mastic/adhesive, airtight paint. Thermal bridges are cheap to eliminate, but takes thought. Heating system, keep it simple. It's keeper to install generally cheaper to run. Ventilation MVHR is normal, but not the only way (unless in Scotland). Conditional MEV or dMEV are other options. Cascade MVHR allows reduced ducting etc. Add PV, as much as you can, add battery, add an ASHP to eliminate gas standing charges. Running costs are as important as anything. Our April energy bill (April has been mostly heating season in Scotland) is about £30.

You are maybe correct. Airtightness makes for good comfort as you have no drafts. Good form factor allows less insulation for the same heat loss, compared to poor form factor. We have a particularly poor form factor, so although great insulation, our heat loss doesn't comply with passivhaus requirements. But we have great views from all main rooms and all bedrooms and the vaulted ceilings make for light airy feel to the building. Having our build comply with passivhaus standards would be almost impossible. Life is a comprise, could have build a nice form factor building, but not sure the living experience would be as nice. Currently sat in from a 6m tall bay window, looking out to a Scottish loch, not sure that is compatible with passivhaus heat losses or heat gains either