SteamyTea

I have started to play about with NGINX as a webserver. Seems pretty easy to use, and it works well with TOR, so no need to pay anything, to anyone. All I have done so far is renamed the daily CSV data file with an .html extension. Popped it into the www directory and given it some suitable access right. It has been chugging along all year without a hitch, which considering it is just an RPiZW hanging by 3 wires from a breadboard on the windowsill is a miracle.

Just what I was thinking. The fitting of the frame should be easy enough to get airtight. But the door in the hole is a lot harder, and may need adjust every now and again. I fixed my leaky back door last year (ended up a simple fix, the threshold had come loose). Not made a huge difference in the kitchen temperature, or the energy usage, but not having a cold draught on my feet is lovely.

Always is the hard part. Why there is so much low quality data analysis about. Spend the rest of the day thinking about it. But, as an example, I take my power data that is collected every 6 seconds, then average it out to the hour mark. This makes life easy as if a group of data is collected between 00:00:00 (hh:mm:ss), anything with the hour 00 in it is greater and equal to 00 h, and less than 01 h. (the date and time format I actually use is DD/MM/YYYY hh:mm:ss, and I keep it on UTC, which is actually GMT). Then when I come to analysis the data , I can group it by date, the DD/MM/YYYY but look at the hourly results, so between 00 (midnight) and 23 (11PM). That gives me a table of what is useful to chart from. From that, I just chart what I want as I can vary the dates to look closely at any year, month, week, day. I do, from the hourly data, plot a time series chart, but i don't find it that useful. The trouble with a time series is that you have to visually calculate, and correlate temperature differences and energy inputs/outputs. Just makes for a messy chart really. Correlations are useful as they can show an overview of that is happening, and what to expect. Major deviations can easily show if something is amiss i.e. leaving a fan heater on in the garage. They are limited though, and have to be used with caution as 'correlation is not causation". Edit: I think I have my axis titles around the wrong way, seems to be showing that the greater the temperature difference, the less energy I use, which is nonsense, shall look at this later. I use Excel as it can usually handle quite large data sets, I put each data set on a separate sheet i.e. electrical power, internal temp, external temp, grid data etc. Then from those sheets create the hourly data, and from that sheet, start the analysis. All my data is saved as basic comma separated text files. These are small (relatively compared to say the same data in Excel), easy to merge together (dos command copy) and can be highly compressed and saved somewhere after the data is put into the main spreadsheet. All of my power, and house temperature is 110 MB for the whole of 2022, once compressed it is 8.89 MB. So tiny, really. You can also easily encrypt the data as most programs have an encryption utility built in.

Decide what the results of any analysis are going to show/look like. Then decide what granulation you want to sample the data at first. The sample rate affects the accuracy and precision. Then decide what is the the long term data storage policy. After that you can start to think about hardware and software. I find a time series of very little use. I just use an hourly mean/min/max as the basis for some correlations and binned data analysis. These tend to show up anomalies much quicker than a time series.

A gentleman never tells

Who knows.

Just googled "looking for BBC".

Just had a quick Google. Seems that if your generation and consumption are similar, then you are not taxed. Typical UK law though, vague in the extreme. So another way to look at it is, it can be taxed.

With the old Fits, any sale was free from taxation, is this still the case. Has anyone bothered to check?

Just a lookup table is all that is needed. Call it Bayesian Statistical Control if you like.

Bet that's a first ever sentence on any forum, anywhere! This is Kernow, nothing is out of bounds in the off seasons.

His bicycle making mate had trouble with quality control. To keep the price down the Chinese manufacturer would change the specification, without notification. This lead to some failures if I remember correctly. So what you see and agree on, and what is actually delivered, may be different. Back in the late 80's and early 90's, I was manufacturing come composite cabins. Was approached by and Indian plastics company that offered to manufacture and deliver to site for us. The really annoying things was that they would be using the same resins as us, there was only two that were suitable, and both were UK manufactured. They could buy in at a quarter of the price that we could. I felt that I was being ripped off by our suppliers. When one he the reps left and went to work for another supplier, that did not do what we needed, I asked him how much I was over paying on one of the resins. "About £4/kg" was the reply. And we were the large users of that resin in the country, we used about 10 tonnes a year, the rest of the country used about half a tonne. Thieving suppliers.

I don't really understand bio-chemistry, it is probably the hardest of the real sciences to get to grips with, not like physics, which is pretty easy really. One thing that I have often wondered is how well tanks and plants deal with small amounts of regular usage i.e. single person household. Not much poo or wee, but quite a lot of bath/shower water.

Just don't overload them.

Yes, that is right.

Loads of ASHP down on the harbour side at St. Ives. They often get a good soaking from a decent south west hoolie. To be honest, I can't think of one that is showing signs of corrosion. Here is one that has been there years.

They may only put the electrical side right to make it safe. Then walk away. MCS are probably using this as an excuse to not put the real problems right, well at least for the time being.

Moving from the home counties to Cornwall improved my hayfever.

You can copy and paste the content. Or put the link up and we can join.

Probably just kicking the can down the road. Only for half the year, when it is daylight. They should be reasonably safe if the ends have the standard connectors on them.

Post up a small file and we can all try out out CAD programmes and see if one works. Try Windows 3D viewer, says it opens *.exp

Am I allowed to mention how fertility drops off as women get older. Gary Glitter is back inside, so the dark web is all yours.

MVHR needs to be compared to the alternative, which is uncontrolled ventilation. If MVHR is not fitted, the air leakage has to be >3 ACH (I think).

As you say, they need to be properly specified. Most heating systems, in most houses, cannot cope with extreme cold anyway, why the sales of electric heaters goes up when we have a cold snap. As does the amount of electricity produced. So in reality, there will be little difference. Burning a methane/hydrogen mix in an undersized boiler will not help any because it is hydrogen. Same problem, just different gas mix.

I don't think many, genuine, environmentalist, take hydrogen seriously. As well as the storage problems, on top of the high energy costs to produce it, there is also hydrogen embrittlement of metals to take into account. Gas boilers may have to be replaced a lot more often.