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Posts
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Everything posted by SteamyTea
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Getting good seals on underground drainage what's the secret?
SteamyTea replied to MikeSharp01's topic in Waste & Sewerage
Is that because it has two free electrons in the outer shell that are happy to pair up with another two free electrons on another oxygen atom. Something like this (I never really got the hang of chemistry as it always seemed to be a memory test) Edit: Actually not quite right as it should show either two new pairs of electrons (as there are 4 free ones) or one new pair and two free ones (one on each atom shell). -
Can you add a sacrificial anode, and would it be any real help?
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You get a view of the countries largest windturbine, that I would like. Less than a mile from you is Windmill Hill
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Getting good seals on underground drainage what's the secret?
SteamyTea replied to MikeSharp01's topic in Waste & Sewerage
That is noble gasses isn't it. Everything else is a molecule. With Oxygen being a right tart and sticking to almost everything. Carbon is the same. -
Getting good seals on underground drainage what's the secret?
SteamyTea replied to MikeSharp01's topic in Waste & Sewerage
I had to teach statistics to second year SS students. Was pretty easy really as only dealing with the tails, which sums up the mentality of SS students. They only know their life experience and assume they know it all. One of my worse students ended up serving time for fraud and theft, no surprise as she was a junky that knew everything. -
Will that be an 'up to' and in reality only as good as you can get. I also assume you mean Mb/s
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Getting good seals on underground drainage what's the secret?
SteamyTea replied to MikeSharp01's topic in Waste & Sewerage
Like social science, and economics, it just isn't. But Rutherford's statement was political as his wife ran off with a dirty chemist. -
Getting good seals on underground drainage what's the secret?
SteamyTea replied to MikeSharp01's topic in Waste & Sewerage
You will have to check with a chemist. “All science is either physics or stamp collecting.” Lord Rutherford -
Getting good seals on underground drainage what's the secret?
SteamyTea replied to MikeSharp01's topic in Waste & Sewerage
Water molecules are 275 picometres Oxygen molecule is 346 picometres. Nitrogen molecule is 364 picometres But I think at that scale it is not an issue. -
Paint it with a bitumen paint and make sure that the inside can stay dry. You could always cast a concrete floor in it to stop any floating.
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Just dig a hole with the JCB and bury the shipping container. Then a few light tubes and a periscope. Will be quiet, may float when it rains, but that gentle rocking s soothing.
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Thermal mass
SteamyTea replied to Thedreamer's topic in Energy Efficient & Sustainable Design Concepts
It is the same thing really. Decrement delay is time.K-1, or temperature drop/raise Thermal Inertia is energy.m-2.K-1.s0.5 So you can think of it as as the difference between R-Values and U-Values. You know they are related with R-Value being measured in m2.K.W-1 and U-Value being measured in W.m-2.K Just arithmetic juggling really. The interesting thing is that for any given mass, to get a timeshift, there is a narrow temperature difference band it can work in. Below is a chart that modelled a 1m2 section of wall made from brick. To get a 12 timshift, you need a temperature difference between inside and outside (called the energy forcings) of 1.8°C. To get a more useful 8 hours temperature release the temperature difference will be 1.2°C, which is basically parity with external temperatures once internal energy forcings have been taken into account. For OSB you can have a temperature difference of 19°C and have any absorbed energy released over a period of 8 hours. I have to put in a caveat that this is just working with my house and my temperatures over the last 4 weeks. I am sure those figures above will change when I have more data, and it is just a basic model, does not take into account air changes (they are kind of built in as it is real temperature data) and window area (again kind of built in). -
Like calling the Post Office, Consignia. I can remember when an Opel was a sweet, a stone and a car, now it is only two of those. Shall I rebrand?
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Could well be because of the nuclear side: https://www.theguardian.com/environment/2018/jun/04/uk-takes-5bn-stake-in-welsh-nuclear-power-station-in-policy-u-turn I still call those crappy little Japanese cars Datsuns, even though the are Renaults now, and built in Sunderland.
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Thermal mass
SteamyTea replied to Thedreamer's topic in Energy Efficient & Sustainable Design Concepts
Done a quick 'first draught' of different materials (got to look up more material properties). But if my house was made of brick, it would have had a mean response time of 35 hours over the 11°C mean temperature differences that I have good data for. 35 hours is greater than one day, so not much use. If it was just OSB the mean response time would be 3.8 hours over the same mean 11°C, so a bit more useful. Just got to find some more material data until I can find something that would give 12 hours, which would be best on average, but as this time of year the days are long, gentle overall warming would happen. I shall see if I can get some more data. But as an aside, I have been pretty happy with the temperature inside my house the last 4 weeks or so. -
Thermal mass
SteamyTea replied to Thedreamer's topic in Energy Efficient & Sustainable Design Concepts
Or grow cacti. I may have a go at modelling a wall that is being hit by the sun, just to see how much energy it can absorb and loose. I ma have enough data from the last month to do that. -
Ship some over, make them work 12 hour days, deduct board and lodging from their net wages and keep hold of their passports. Apparantly there is trouble getting pickers down here this year, serves the gang masters right for treating the workers like slaves.
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No ta.
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All of them, including roofers, which is a worry. I would go out taking pictures of builders, but that would be just strange.
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I have. Be an interesting correlation.
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Thermal mass
SteamyTea replied to Thedreamer's topic in Energy Efficient & Sustainable Design Concepts
That much, I wish -
My ex girlfriend got a local builder in because 'he was the expert on Cornish Units'. He also owned a pub. Says it all. Purely out of scientific interest, are fat builders better or worse than thinner ones? Now Poldark. Some of the film crew sometimes come in for supper when they are filming locally, not that I would recognise the Aidan Turner. I never recognised Ray Davies of the Kinks and he used to come in quite often.
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Thermal mass
SteamyTea replied to Thedreamer's topic in Energy Efficient & Sustainable Design Concepts
Just heat capacity would do. If you have a look at this page you can see the thermal properties of materials. Some may surprise you. http://www.kayelaby.npl.co.uk/general_physics/#2_3 -
Thermal mass
SteamyTea replied to Thedreamer's topic in Energy Efficient & Sustainable Design Concepts
All 'Thermal Mass' is, is the product of insulation and specific heat capacity of a material. There is a lot of misunderstanding about how it can make a building thermally stable. Nearly all the examples come from 10° South of the UK with much sunnier climates and much higher temperatures, especially in summer. When I was studying the affect of solar radiation on mass (granite in fact), there was no real gain to be had with typical UK insolation levels. Our old mate Ed Davies did some work on it and concluded that a sheet of 9mm plasterboard could absorb and release energy just as well as 4 inches of brick. Don't fall into the trap that adding mass is all you need to do to store or stabilise thermal energy. If you want to slow down the rate of change of the losses though a wall, look at cellulose insulation. It has good insulation properties, good specific heat capacity and very good sound absorbing characteristics.
