SteamyTea

I went to school with a bloke that lived at Wingham Court. Now if my memory serves me well, his name was. Robert Conan Windham Lesley Maude. There may, or may not, be initials, other than mister, before his name now.

Why we have distributed computing. https://www.newscientist.com/article/2215680-mathematicians-crack-elusive-puzzle-involving-the-number-42/

Just as bad down here, there is basically no wind today.

I looked at the weather forecast, it was good, got the scaffold tower up, pulled the guttering off to paint the fascia. Then this.

How difficult would it be to write a program that cycles though all the permutations, or is it combinations. Similar to what they already have. https://what3words.com/products/batch-converter/ Then just publish it online, and be damned.

Could use that module to charge 10 cells and run the pump from that. Or put a fat resistor on the wires and drop it direct into the hot tub.

Following on from what @Ed Davies said about needing a height difference to get theromsyphoning going, and rather than having a largish tank of water above the panel or tubes, could one fit a heat exchanger above them. Might even be possible to fit that in the loft and not use water as the transfer medium.

Looks like there is a joint in the felt, why did they not thread the cable though there?

Put it in a tin with an inlet pipe.

You could ask the DNO how large a PV installation could be fitted to 1 phase, they may allow more than the usual 16A limit. Then hang the appropriate loads off that circuit. Sound like an accountant wants to turn off the things (are these lasers) that make the company money.

Hard to imagine Winston Churchill thrutching on on, but easy to visulise Trump, trumping.

If it is yellow, let it mellow.

One of the reasons I like resistance heating, it is so simple to control.

PV can contribute to the running of the ASHP if timed right. What it cannot do is quickly switch on and off.

The SunAmp does not loose too much energy when it is charged, so the running costs are just a little less than parity i.e 1 kWh in, 1 kWh out. An ASHP runs above parity, usually somewhere between 2.5 and 4. So 1 kWh in, about 3 kWh out. The limiting factors of an ASHP is that they tend to get the high coefficient of performance at lower output temperatures. So limiting the output temperature to 40°C improves the CoP. This means that a larger storage cylinder is needed, a larger cylinder can mean larger losses, but good insulation will counteract this.

This is the wind for Newquay.

I am hoping that it pushed north, may get a decent August then.

Sunnier is an odd term, especially in the UK. We can mean sunnier compared to yesterday, sunnier because the sun is high in the sky, or not cloudy. When looking at power generation, we could mean just longer hours of daylight, or very powerful daylight. Why we use terms like radiation, irradiance, insolation, but much easier to stick to power and energy, as that is really what we are interested in.

Don't tell Trump, he will blame it all on the Rising Sun.

Right, I stayed up late (for me) and got up as normal, and looked at this problem a bit more. If we are trying to see what sort of difference there is between days and if a sunny day can 'influence' the next day, then the answer down here in Cornwall, is no. Only 21.5% of the time are the conditions matched (by my criteria, the no rain days), which is close to my earlier statement that tomorrows weather will be within 20% of today's. Not really. The average difference in solar power is 5.2%. There are 42.5% days that are sunnier than the day before, and 57.5% when it is not as sunny. I normalised the data to reduce the influence of seasons. Interesting that we ended up in the same place, eventhough we used different methods. I would call that a good result. Because of the rough difference of 40% (more sunny) to 60% (less sunny), this may be why we remember a few good sunny days in a row, they are not normal. The absence of normal. In the past, I looked at the influence of wind direction, I seem to remember that was a better indicator of solar power, and temperature.

Quite fun to look at days with similar hours of daylight. Then look at the temperatures and outputs.

Quite interesting as @ragg987 is pretty central in the England landmass, and has a large plain to the west. I am quite the opposite, surrounded by sea and a large ridge that splits West Cornwall quite nicely between North and South. Perranporth is on the North side. When I get home I shall have a look at the proportion of sunny and rainy days. From that it should be able to get an idea of standard error. If the error is close to the standard deviation, then we can say there is no correlation. I may normalise my data to see if it makes it clearer. Bugger that work gets in the way, it ruins free thinking.

Right, after struggling with a new scaffold tower for 3 hours, and finding out that I do need the extension to get to my top windows, I decided to do a simpler thing and chart the relationship between successive rain free days and solar power. As @Ed Davies mentioned. There is less power in winter than summer, so this possibly skews the data. Normally I would segment the year into weeks to get a clearer picture, but as there is no guarantee that Sunday really is sunny, or Monday for that matter, this cannot be done. So what I have done is to count the incidents that the sun is delivering power into 100W.m-2 bins. So 0 Up to 100, 100 up to 200 etc. Then plot the percentage count for 1, 2 and 3 extra days that are rain free. I have chosen rain as a key indicator as you can have cloud without rain, but you cannot have rain without cloud. The percentage count is of all the valid datapoints between 20/01/2010 and 16/09/2014. So about 4 and half years worth. Basically, my interpretation is that the more rain free days you get (and I get no more than 4 in a row), the more solar power you get. This may not translate directly to solar energy.

Is it going to be Python?

Let's see if I can upload my data. It is a zipped file, so extension needs changing from txt to zip Format is csv. It fats out to about 32mb Solar_Perranporth.txt