SteamyTea

I am at work then, so may be worth having a look at. Is there a live feed that I could use to switch on equipment when the price is low i.e. if unit price is less than 1p, switch on water and storage heaters.

Get the temperatures sorted, then obsess about the flow temperatures.

Does seem your UFH is not optimal, have you got an infra-red thermometer, then you can point it at floor and see what the temperatures are.

That is the losses at 20°C temperature difference. The real difference may well be only 3 or 4 K for a fair slice of the year and 10 K for the rest. And the losses only count when you actually put on supplementary heating. I turned mine on last night (as 16° in the house, 4°C outside). But it will probably go off again after the cold spell.

This is a confusing question, 'Q' is often used for heat flux. if 3.5 kWh a day are lost though the fan, the power is: 3.5 kWh / 24 h = 144 W

@Home Farm What is confusing (though I often get confused too).

As a rule of thumb, cubic metre of air has a mass of 1.2 kg. The energy needed to heat 1 kg of air by 1 K is 1 kJ. There are 1000 litres in 1 m3. There are 3600 seconds in an hour. 6 [lt.s-1] / 1000 = 0.006 m3.s-1 0.006 [m3.s-1] / 1.2 = 0.0072 kg.s-1 0.0072 [kg.s-1 ] x 3600 = 25.92 kg.hour-1 To convert from kJ to kWh multiply by 0.0002778 25.92 x 0.0002778 = 0.0075 kWh I have skipped the conversion to kJ as air has a SHC of 1 (near enough), though there will be some energy in the moisture) This gives you a loss of 0.0075 kWh for every K, or °C, temperature rise, for every hour the fan is running. So taking the 20°C temperature difference in your example, to run that fan for 24 hours will be: 0.0075 [kWh] x 20 [K] x 24 [h] = 3.46 kWh

Seems it happened on the 26/05/2019 for 9 hours and again the next day for 2 hours. This lead to an average system price of -£12.16/MWh. https://www.current-news.co.uk/news/uk-negative-power-pricing-record-smashed-and-balancing-costs-spike-during-extraordinary-weekend

A guy I knew at university worked in Barbados for several years as a boat builder/repairer. I think he sailed back to Falmouth in a boat he build. I often wonder why he came back.

I have recently read that it may be possible to get paid to take energy when there is a surplus. Somehow I don't think this is going to happen, was more smartmeter.org.uk claiming this was a reason to get a smart meter. But if that is the case, and electricity during other times is not too costly, I would consider getting some more storage heater and getting them to switch on at the right time. I think I could reliably pull 70A, so that is ~16 kW. If they were paying 3p/kWh to take power, and that window is half a a day, 3 times a week during the winter, then that is ~£12.50. I better go on the hunt for some free storage heater.

A wood gasification burner maybe. Or a windturbine. Or invest in a solar farm as offset.

I don't know how much a SunAmp weighs, but my storage heaters probably have a greater energy density than a SunAmp. The reason they can do this is because they can storage at a much higher temperature.

So is it a storage heater then. The FFR worries me. "Each device communicates over the internet to a IoT platform where they can be aggregated into a giant Virtual Battery or Virtual Power Plant" Locks it into the whims of others.

Wood burners emit many different pollutants.

If you get too much of a temperature drop up the flue, the smoke don't come out fast enough. But at least you keep your mess private, rather than giving a little bit to everyone else.

Usual, in Devon, to mention you have a gun, I think.

well if people don't do a job right, what do they expect. Bit like making mashed potatoes, without boiling the spuds.

I don't think there is an increased risk of leakage with an inroof system. May even be less of a risk than, what is in effect, a retro fit. If you have closely watched s PV system being fitted, you will know what I mean.

May only be a case of changing the resin. You may find another use for the polyester, make a boat, or a pond, some guttering. Or sell it to the Boy Scouts to make canoes. Just thinking that the rain is going to be on and off for the next, I don't know, 40 years.

Never used it, or seen it in action. But I have used PU resins a lot in the past. They are tolerant of moisture, some actually need it to cure. I seem to remember that they are more viscous, so may seem a bit alien to people that are used to polyester, and I am not sure how easily they break down the binder in the mat. There are different types of binder for mat and woven cloth does not have any at all, so that may be an option. Call them up and ask for a sample. You are on the wrong side of the country too.

Or you could change to a polyurethane resin system that is moisture tolerant. If you were not at the wrong end of the country, I would come and help, be fun to try out a new system. https://www.apolloroofingsolutions.co.uk/product-overview/single-component-pu-waterproofing-system/

I agree. I hate them. When people wash dishes by hand, how much water do you put in the sink and do you rinse stuff?

Slovin's Formula n=N÷(1+Ne2) n = number of samples N = total population e = error tolerance Now you should know how many block you have, and taking @TerryE idea about tolerance on the U-Value, you can set your tolerance level. Make up formula in Excel of x and y values, where x is the number of blocks long, y is the number high, then assign a random number to each. That is then the position where you need to sample. Avoid any duplicates, but do not avoid adjacent blocks. =randbetween(1,x) =randbetween(1,y) Easy and interesting

When it comes to shifting parcels, I use Parcel2Go, always amazed how cheap it can be to send stuff.

A mate of mine works in the AD industry. He works in $100,000,000 projects. There was a couple of chancers based near Coombe Martin, with the help of an Irish middleman, that ripped off someone over at the other place for £50k. Odd though as they had developed a fuel cell that never needed recharging. Just as well as one of them told me that OF never paid back its energy debt.