SteamyTea

Why go to the bother of sinking pipes into the lake. Why not just pump water out of the lake and feed that into the heat pump via a heat exchanger. I think that is how it is meant to be done.

Generally, in science, it is always worth looking at the actual units rather than in percentage terms. To give you an example, dairy farming uses about 1 GWh of electrical energy a day, Sound a lot, but is about 3% of our mean energy usage. Well worth it for something to put in tea. That is about the same as electric cars currently use.

That is to be expected because it is a percentage of the whole. This is not really the way to look at it. Really should look at the kWh/year and what that is costing in terms of emissions and cash.

More concerning is what happens when you rub their legs together to start the camp fire.

Easily supplied with a £12 fan heater.

So worth it for an extra 40mm. Especially as builders can't work to that accuracy.

What would be the losses if the insulation was increased to 120mm?

Yep, it relies on people thinking that low temperature automatically means low energy. I was recently talking to someone about an UFH system that was being fitted to a new house. I asked how much insulation was being fitted under it, the reply was "80mm, it's the building regs standard".

For a laugh, I made a curved beam for one of my Simple Sunday Experiment. Then bust it.

This goes back a few years to when I suggested that we find a half decent CAD program. LibreCAD is free, and portable still.

One of my sister's many husbands, was the deputy head at a school in Berkhamstead. I lived just down the road at Abbots Langley for a while.

He is back on the radio, with Pippa Haywood as his latest. There is Cock Shooters Wood, I kid you not, it is close to Chequers, you could stay there.

I suspect that you can get away without a buffer tank if the heat pump is a little undersized. There may well bit a bit of a hit on the CoP though as the internal heater may kick in more often and the risk of frosting. I am starting to think that the frosting risk may be overstated a bit, but not seen any data to confirm it. Are you going for a CO2 heat pump, the old refrigerants are being phased out fairly soon I think. CO2 HPs can also run up to a higher temp, that may mean you do need a buffer.

My understanding, from having to read a book about structures, and why they don't fall down, is that the mortar is to stop lateral movement and to seal the gaps. Gravity keeps the blocks in place. Having said that, as it is a garage, a car will hit the wall sometime. So maybe some mechanical fixing would help. https://www.amazon.co.uk/Structures-Things-Dont-Fall-Down/dp/0306812835

Hello and welcome. Rather than get hung up on materials and techniques at this stage, spend a week or two reading up about basic building physics. This may sound daunting, but it isn't really. The main things you need to know are how different materials perform both mechanically and thermally, as you basically want to make an airtight box that won't let any heat in or out. The second thing is concerning your 'eco' bit. The word eco is rather a catchall for whatever people want it to mean. This gives marketing people a lot of leeway to sell whatever they like. A bit of timber cladding on a thermally leaky house is not eco. Also don't get hung up on all the possibilities of what could be done, work within your budget. Having said this, if the orientation is good, fit PV as it can be cheaper than a tiled roof.

I think that is barmy too. I blame the marketing people and their desperate desire to get market share. I have also heard that the charging stations are not that reliable, though that may just be the press playing on peoples fears.

I tend to agree, but I think it would be a hard sell to the general public. But even at a 7 kW charge, there would need to be a significant upgrade as housing is now legislated to be all electric in the near future. Personally I think it is just a cost that we will have to swallow. One advantage of installing secondary supplies is that the DNOs can have fine control over the system. I don't think we can rely on two-way smart metering and altruistic users to help balance the loads.

That is quite expensive. Basically means running in a second supply just for charging, and a larger local substation. More than just a socket on a wall somewhere. I have not seen any figures for the mass of suitable fuel cells and storage tanks. Mind you, current battery packs have ancillary heating/cooling fitted, so they are not as light as they seem. Yes it can, but why would you. It would still cause air pollution because most of the air we have is nitrogen. ICEs are very inefficient and mechanically complex. They also have gearboxes, which just shows the short comings of the engine. When you think about it, the modern car is really a very good compromise considering all the issues they have. I thought that it was the sampling rate that was more important than the compression. If things are sampled at a higher rate than we can hear, then in practicality, it is original sound. I am not talking about highly compressed mp3s here, just the difference between CD quality and grooved quality. But it is odd that DAB radio is a compressed format and it is considered better than traditional broadcasts. But then I only have 50 quid ears, so not really bothered. I just wish that my local DAB transmitter was reliable.

How does it compare to population, or GDP? That would make the government burden even smaller.

Specific energy density of liquid hydrogen is 142 MJ/kg (HHV) and for Lithium Ion batteries it is 0.875 MJ/kg. Volumetric Densities are 2,790 Wh/l for liquid hydrogen and 693 Wh/l for Lithium Ion. It does, on the face of it, look like hydrogen is a winner, but if it was that simple, we would all be using it. The problems come in when storing and converting hydrogen into electricity. This adds a lot of mass to a vehicle. As for old record players, most studio recordings, since the mid 1980's, have been recorded digitally. So anyone claiming that a grooved record is a more honest sound, it talking rubbish. Unless they like really old stuff, and the quality of that was pretty poor.

I peeled the sidewall of one of them, was a bit scary at the time.

I used 5 kWh of energy yesterday to run my house, anyone lower? (not counting over self generation)

I got one, was a nice revvy engine and a fast auto box. Like all RWD Vauxhalls, it cornered well. Would probably be horrible to drive today.

I read something about this, and it did seem to make sense. Apparently, Toyota worked out that with their battery supply capacity, making a large number of hybrids, instead of a smaller number of EVs, reduced the total overal emissions and energy usage. Does make some sense as a stop gap.

Hydrogen is really a dead end for personal transport. The energy density is just not that suitable for cars. It is why car manufacturers opted for batteries and not hydrogen. That is before all the other problems of using any liquid or gaseous fuels. Then add in the mass and expense of a fuel cell to drive the motors, and that they have to run pretty hot to be efficient, it was really a non starter. If it had been such a good idea, the current liquid fuel suppliers would have sorted it out and we would see hydrogen fuel everywhere, but we don't. Then look at Iceland (the country, not the 2 quid a bag for kebab meat people). They wanted to be the worlds first hydrogen economy, it failed spectacularly, though I think they have a small fishing fleet that may run on it. One of the problems of EVs is that gasoline and diesel are just so good at storing energy, are easy to move and decant, and is incredibly cheap. I like EVs, but I still want one that can do a reliable 400 miles between charges and can be bought on the second hand market for under £5000.