SteamyTea

Here is my oven. Can easily do 250 meals in a day, including the fussy eaters and the genuine allergy people.

A 10 m run of that will have a percentage volt drop, at 1 A/12V of 7.3%. I think that is outside the regs.

Pine has a thermal conductivity of around 0.15 W/m.K So 0.1 m will conduct 1.5 W/K (R-Value = length / conductivity). The U-Value is 0.67 W/m2.K (1/ resistivity). Without knowing the exact dimensions, I shall assume that the thickness is 0.04 m. 0.67 [W/m2.K] x 0.04 [m] = 0.027 W/m2.K for each linear metre. You say it is a warm roof, so the steel will be in the region of 20°C. It is a very rare spell of weather where the outside air temperature is below -5°. So. 0.027 [W/m2.K] x (25) [dT°C) = 0.68 W/m If I assume that the beam is 10 m long, that is 6.8W at -5°C Now my kitchen has two pendant lights of 3W each and my laptop at about 10W that is 16W. (It is early and I may have made a mistake).

Thanks. Shall take a look at them as I fancy kitting out the house with sensors again.

I think you have highlighted a common misconception about GRP. If you build a suspended walkway, you would expect a proper design. Something built from GRP that does the same job also needs a proper design. What it does not need is someone that thinks they can just mix a bit of resin and hardener together in a bucket, soak some chopped strand mat with it, run a paddle roller over it a couple of times, then think the job is done. I ran a composite factor in the Midlands back in the early 1990s. Half the workforce came from Reliant Cars. Reliant, with a glass manufacturer and a couple of resin makers had developed a system that was designed to make the manufacture of car panels easier and cheaper. The system worked well. Was used in the DeLorian as well. Trouble was, those Reliant worker were not using the same materials at my factory, so they used the same manufacturing technique as they had at Reliant. The quality was shit, absolutely hopeless, it lacked a decent finish, had high structural failure rates, and rejects that needed remedial work was over 90%. Why I always say, GRP has to be done correctly. It is not hard to do right, but it is very easy to do it wrong though ignorance.

Numbers are right. You have an S for siemen, electric conductance. Should be lower case s, for seconds, which is part of the time, t, family. T is, in this case, the SI sign for time, because it is at the start of a sentence, but this T is now temperature (sometimes), as T can also be for tesla, magnetic flux density. Really annoying that autocorrect changes things.

Care to share a supplier. I have some cheap DHT11s that are rubbish, the DHT22s are better. CO2 sensors seem expensive and limited life.

My house, an ugly 1987 box is just inside the boundary of a world heritage site. I can't even change my timber shed without permission, or use a lighter, or darker tone of woodstain on the windows. (expletive deleted)ing nonsense, not as if every single place withing half a kilometer of a disused mine must be preserved.

I did not know you had a Scotch name in the real world. Phil McCavity. How is your best friend, Ben Doon.

Rather than do two lots of calculations, insulated and uninsulated. Assume the cavity is insulated and size the cable to that.

People have bought into 'lots of natural light'. So while in terms of exposed area, windows may only account for 25% or less, they can have a disproportionate affect on the heat losses. So I am all for improvements. Technically the glass adds little to the overall U-Value, so adding a thin pane in the middle is a sensible thing to do. A 1mm or thinner sheet of cast acrylic would do as it will reduce the convection currents.

By someone that knows what they are doing, so not a chancer that 'made a canoe once'. We made the walkway at St. Mary's Hospital in London. Not sure if it is still there as it was nearly 40 years ago. A lot of marinas have GRP walkways. You generally will not notice them. They are constructed in a modular fashion to aid installation, they are not made to be light and strong, just lighter than steel and concrete.

It may have to be done with a polyurethane resin rather than a polyester, it all depends what sealant has been used already. There are a number of ways to make a strong catwalk on a roof, a non slip finish is important though.

@Seasider As you are in the devil's county, you should easily find someone that thinks they know how to GRP the roof. Done properly you will be able to walk in it for the next 50 years. Felt and EPDM do not make for good foot paths.

Show the pictures to the shop manager and ask their advice, and a refund.

A2A is probably your best bet, Avoid infra-red, it is only resistance heating after all. You could cost out storage heating, it is cheap and easy to install, though running costs are tariff dependant. I currently pay 11p/kWh at night and 40p/kWh during the day. But if you are installing solar, you can get them to contribute (divert) to the storage heater. What are you doing about hot water?

Can you do it with one of these, or similar. Just pop the live wire that the gate motor is on through the unit. https://www.ebay.co.uk/itm/404322983939

Pretty simple and nicely packaged. I think it. A bit of extra pipework and that should be possible. A venture bleed system should do it,

Not long after his wife left him, we both used to do our shopping at Aylesbury's Sainsbury on a Monday evening. Used to see him about town quite a lot, along with DLT and Mike Read (DJ). Buckinghamshire seems to have a lot of BBC people in it.

Not really a problem for me down here.

https://www.aircondirect.co.uk/p/1449870/10000-btu-wall-mounted-air-conditioner-and-heat-pump-without-outdoor-unit-with-wifi-for-rooms-up-to-30-sqm £800 now. Should have got one a year ago.

Have a hunt around on here (do a google site search), think the units were about 700-750 or so. Think the noise was around 50dB, my bedroom is usually around 25dB.

https://www.explainthatstuff.com/how-low-e-heat-reflective-windows-work.html

Rapid aging. Cycle the tapes though the expected temperature and humidity ranges several times a day, when you get to 50% adhesion, you then extrapolate that to 100 years. Alternatively you set a lower bound to the adhesion limit and rapid cycle until you reach it. Rapid aging, time to failure and time between failures is an interesting engineering field, uses the Poisson Distribution to predict the end points.

Oh yes, Ramsgate. If you look in the background of the other picture, you will see the oil storage units. I find the colour of the sky interesting. One is in Kent, the other the West Indies, both overcast days.