SteamyTea

Not so sure about this. With small turbines, the area in the centre is pretty 'dead', so generally small turbines have very poor efficiency. Also as the blades are fixed, their efficiency tends to vary with windspeed, with peak efficiency generally happening a little below the windspeed where peak output happens. That is before all the electronic that convert or condition the output have had a chance to convert mechanical energy into electrical energy and thermal energy. You can get a rough approximation of yield by using statistical methods involving an accumulative weibull distribution, but this tends not to work too well for small turbines that are affected by the ground, wind direction and the other problems mentioned above. As a general note about wind turbines, they very rarely produce the name plate output as the windspeeds needed, say 15 m/s is quite high for close to the ground. With small turbines (domestic), they are designed to automatically stall at just over the maximum rated windspeed for safety reasons. The rule of thumb for large turbines is bigger, higher and with as little 'clutter' around them. Why they work so well out at sea, or on top of a hill, or even on a plain, they are rubbish alongside a hill, high buildings and even woodland.

If you are making a WT for fun, it need not be expensive, or that efficient. When I worked for a small turbine manufacturer, I suggested that they just made the tower and generator. Let others make the 'sexy' bladed. People seem to think that is where they can improve over Betz, so let them learn. I still think that the idea has some legs, but it does require a stringent understanding of what loads can be placed on the generator. Also, rather than an electrical generator 'up top' why not a simple air compressor. Store the air in a tank, or lots of tanks, release through a turbine when needed. Can get a bit of thermal energy to. Only for small off grid stuff. Large turbines need to pump the juice straight to the grid. Less waste that way.

It may be under File-->Export-->[pick your format from list] Quick look at their website and it says that it can only export as PNG, SVG and DE https://drawexpress.com/faq.html

@DarrenA Do you know if anyone has started but abandoned their project yet?

If I could do that, then I would not need any heating.

There is a bit of a myth that supply and demand keeps prices at the optimal level. This is only true if you take a medium term average. That happens in the short term is that prices go up, or down in steps. This is because of production capacity. So say you have a factory that can produce 1,000,000 bricks a week, to make 1,000,001, you need a new factory. It makes that extra brick quite expensive. So what happens is that before the major investment is made, prices start to rise, regardless of production or sales volumes. Perversely, this also happens in the reverse situation, This is to pay the costs of reducing production i.e. righting off capital expenditure, staff redundancy payments, relocation expenses, different marketing strategies. With small companies, that may have overproduced and then gone bankrupt, there were bargains to be had at auctions. This tends not to be the case with larger manufacturers and suppliers. They now go into pre-pack administration, fail to pay their suppliers/landlords/councils, but don't pass on those savings to the consumer. Or sometimes they get bought out by another company that is in a similar or allied field. Buying up a competitor is a good way of charging more. Now a quick look at the UK economy on Wikipedia shows that 1.5% is agriculture, 18.8% industry and 79.7% services (2016 figures). So where would you sensibly put your money, in agriculture or services? Industry is quarter the size of the service sector. It could be argues that agriculture, being so small, has the greatest potential for growth, and if you listen to Farming Today, they seem to think that the market will be challenging, but have greater opportunities. This may or may not be true, but I suspect that the opportunities are for the land owners, rather than the people doing the actual work (we have some odd tax rules around farming). Many think that once we are free of EU rules and regulations, and even if we just trade under WTO agreements, we will be free to buy from whoever we want. Ask a USA dairy farmer how much they now sell to Canada, which has an agreement with the EU to buy 80% of all their dairy from the EU, in exchange for concessions to sell grains and metals to the EU (they can sell a few other things as well). Canada was not a dairy nation, but it wants to do more trade with the EU, so the deal they agreed did not affect their economy much, probably reduced prices, but it has locked out trade with some other nations. The knock on affects of this are currently unknown. So for Canada, they got a good deal, the EU got a good deal, for everyone else, not such a good deal. So this idea that the UK can freely trade 'with the rest of the world' is nonsense, there will be restrictions, usually financial. This is why one of the UK's economic successes, the banking, insurance and financial services is moving registered offices and personnel into EU countries. The bulk of our earnings, as a nation, is in those sectors, neither the UK government, or the EU parliament are in the least bit bothered about the cost of bricks or windows. If you take cement production in the UK as a proxy of general construction, then the figures are not looking good. There was ~2% decline in 2016, by 2018 the market was 4.5% smaller, but the cement industry put a glossy spin on it saying that sales had increased. Increased from a lower base. Capacity has been taken out of the market and prices have risen above general inflation. Much of of the supply has been for large infrastructure projects, mainly Cross Rail and the hope of HS2. Cross Rail is at an end now and HS2 may not happen, nor will the Severn Barrage. Or a new London Airport. So where does all this leave us. In a tight place financially. Expect price rises, harder to source materials, lower quality and less choice. Refurbishment may be a better option that new build.

Welcome I speak no Portuguese, except two words, one is rude, but my neighbour is fluent in it. What kind of timber cladding for a roof are you thinking off. In the UK we tend to use tiles or slate. Though we do use rolled steep sheet and composite plastics (rubber). But the best is really solar panels, they can act as a protective cover and generate electricity.

One of these, £112 https://www.amazon.co.uk/Machine-Automatic-Cordless-Rechargeable-Electric/dp/B07TN6QL26?psc=1&SubscriptionId=AKIAILSHYYTFIVPWUY6Q&tag=duckduckgo-brave-uk-21&linkCode=xm2&camp=2025&creative=165953&creativeASIN=B07TN6QL26

But he probably already assumed that there was something wrong, He should have done the heat calculations first, then based on that, looked for evidence. (he may have, but my experience of dealing with ecology students is that they assume that 'man' will change everything for the worse, and the food chain will always collapse)

If you know the maximum power of the windfarm, the length, diameter, resistance and specific heat capacity of the cable, then look at the conductance to the round, you should be able to get a figure.

Just ask for a smart meter to be fitted, they will be out like a shot.

Always worries me when I see something mistypes. (I am the master at mistyping, I do it all the time)

That looks like an old meter, they are meant to be changed every 20 years I think. What are the chances of moving it a bit, would it help.

Wholesale pries have dropped recently, so current fixed deals may not be the best. Should have an update from OFGEM about new pricing soon.

True. It really is amazing how well the bodies last these days. Last 'rusty' car I had was a Merc C class from about 20 years ago. Thankfully it was a company car.

It is following a log curve, which is probably correct. Power needed to move air via a fan follows a cube law, multiplied by the efficiency. The efficiency is set by Betz Limit.

Would do me a treat, I may have to look at it. I can easily charge everything up in 4 hours. I suspect that the rate won't apply for a second year.

You still using an abacus. Very modern. They have a new system that uses two sliding sticks. Better than putting notches in a twig.

Did anyone do any paperwork this weekend then?

Won't they just say they cannot supply at the price? They could just refund any advance, or go bust. There may be cheap windows to be picked up at bankrupcy auctions. As windows seem to give so much trouble, should they not be made second, after the foundation, then build the walls around them?

Where they cleaning up the food waste in St. Pauls?

Because they get poisoned when they eat Great Crested Newts. I see lots of badgers 'sleeping' on the side of the roads. When I worked in London, my Sales Manager had to pick me up as we were going to the very exciting plastics show at NEC. I told her to drive up the M40 to High Wycombe, wiggle though the town and take the road past Hughenden Manor, turn right by the pub, then left at the end of the road towards Chequers Estate. Eventually you find Aylesbury. She was amazed at the amount of road kill, or supper, as she assumed us swedes called it.

That was your personal salary, I suspect that the median of £25,000 now (or whenever the survey was done) is household salary. The way it was measured changed sometime in the 1990s. It also now includes benefits, which as anyone knows who has claimed Working Credit, knows is a pigs ear of a system.

Yes, I suspect it is the same economically too.

A few years back there was an area of St. Ives that was one of the poorest in the EU. Median household wage was 60% of national average. Was 'cured' by moving the people. I park in one of the streets as it is free, but a steep climb back to the car. Places like Ruan Major and Minor on the Lizard are so remote they are effective out side the economy.