SteamyTea

I think the problem is disposal of them, rather than the normal usage of existing ones. They cannot be burned easily and they cannot be buried (no point, they don't degrade).

Spoonerism is just swapping the first sounds of each word: what makes me such a shining wit. Malapropism is using the wrong word, usually to comic effect, so I may just fade into Bolivian.

They will be close the the mean air temperature, which is about 18K lower than body temperature. The problem is that tiles conduct heat well, so they may feel cold. Will also help water evaporate away quickly, though this can cause discolouration of the grout (ask other about the best stain resistance grout).

Boil the fruit with lots of sugar and call it jam. For some reason, we are being inundated with flies this autumn. While I like the idea of a green roof, not sure I want to attract critters close to my bedroom window.

If it was on the ground, it would be called scrubland. Though they do say that a weed is only a plant in the place you don't want it.

Sounds to me like the only thing missing is a generation meter. Being France, there will be several metres of forms to fill in, after lunch, and then weeks of waiting until a civil servant stamps it.

You can get a water cylinder with a heat pump built in, that may be the cheapest to run, though the most expensive to buy (the Ecocent is just a branded Chinesium model at 4 times the price). While an E7 DHW system is cheap to run and install, it does mean that your daytime electricity is expensive, that will negate much of the savings if the A2A heating. Instantaneous water heaters are good, but need to be high power i.e. 10 kW or more. This may mean updating the consumer unit. You may need a water softener as well. So really just a case of booting up Excel and working it all out.

May be micro inverters on the back of the modules.

You can get PV diverters. These units are designed to turn on a remote load i.e. water heater, when they sense power being exported. There is usually a minimum generation they can work down to, so good for resistance loads, not so good for inductive loads like a heat pump. Heat pumps don't like being started and stopped too often. The usual way to 'run' a heat pump from PV is ti take the statistical route i.e. max generation is around local noon, so a couple of hours either side. You will still be importing energy during these times, but less than usual. You have to balance that with whatever you get changed for you importing energy, it may still work out cheaper to run the heavy loads at night, only you know your tarrif. Depending on what you get paid to export, you may find that the cash generated is a better option.

Or a water pipe with clear ends.

Can you run a Mac OS on it?

Did I get it the wrong way around, they are fixed current devices (I think LEDs are the same).

I am not sure about this (as not an electrical engineer) but I think that PV modules are fixed voltage, it is the current that varies with solar intensity. If that is the case, then as long as the module voltages match, there should not be a problem. If that is not right, then maybe individual module optimisers can overcome the mismatch.

3 metres

Feel free to improve the code and post it up.

"The build starts with lovely weather but by the Thursday most of the UK has a yellow weather warning for rain, we had 23mm of rain Thursday, 14.2mm on Friday and another 27.7mm on Sunday." When I moved into my current place in 2005, it rained every day for 66 days. Plan for constant rain.

Be interesting to start a thread on here about getting data out of heat pumps. There are enough people, with different heat pumps, and a few people with good IT skills, should be possible to create a few basic packages that run on basic 'computers' and can store data. Leave the analysis up to the people that are interested, just create some text files of say electrical usage, run times (with timestamps) mass flow rate, flow and return temperatures, room temperature and outside air temperature.

These seem to give mixed results, especially with the electrical input numbers, which are critical.

With a raspberry pi. Some cheap 1wire temp sensors, a flow meter and something to read the electoral power input (see my blog).

Look for any sources of liquid water. These could be water pipes, gutters, down pipes, ground level above a damp proof course. Condensation is generally caused by a cold internal wall, so may be low levels of insulation, or very high humidity, as in a bathroom.

Have you thought of making your own?

@Colink Will be here be enough room to fit pipes, and insulated them in a false cavity? Many people think that it is not worth insulting pipework unless it is also used as cooling. I disagree with that (not the cooling) as you just end up overheating an area with lower thermal resistance to outside. The whole idea of the vapour control layer is to stop warm, moist air condensing in a cold cavity. If you do get to 0 ACH, then you have a nice problem to deal with, just fit mechanical ventilation and heat recovery. Your son really will wish that he removes all the old plasterboard, increases the stud depth, fit his news central heating pipes (properly insulated, a well taped VCL and new plasterboard (possibly in resilience bars). I is very little extra work and will be a lot easier for a much better job.

Thanks, just leave out the odd indices, then it becomes a lot shorter

Integration, in mathematics, is continuous addition. So I suspect that it works in a similar way as a heating controller. It keeps adding, or subtracting, until the desired outcome is reached. The outcome will be one of at least 3 bounds, the other two will be minimum and maximum output if the unit. The unit controller will probably have an initial set point (in the middle of the performance curve) and then is manually set to add, or subtract 'degree minutes'. Degree minutes are the product of the temperature and the time it is delivered i.e. multiply flow temperature by how long the system is delivering (it may be the difference between flow and return as that is the energy delivered). The same can be achieved by simply switching the system on and off for varying amounts of time, but that is inefficient with a heat pump (but works well with a resistance heater).

I don't think so as there is only a tiny amount of hydrogen produced. If aluminium and concrete produced lots of hydrogen, the worlds energy crisis would be over. I would think that the biggest problem is liquid water, it is not called the universal solvent for nothing. This will, in time, break down near enough all materials, with polyurethanes being one of the faster ones. I don't think this is a problem for housing though.