SteamyTea

feet What it is called is irrelevant. So shall call it 1.8288 metres

Scout around to find the best prices of either a complete kit, or individual parts, then ask your builder/plumber/electrician how much to fit. There is scope to save on roofing, they don't have to be bolted on top on a frame, they can be integrated. When I was working for a PV company, out two biggest expenses where sales commission and scaffolding. You don't need one of them and the other you will have on site.

Is that because you got estimates for retrofitting, rather than fitting during the build?

I am not going to get too deep into this, but when I went to Jeremy's house while he was building it, the one thing that amazed me, more than anything else, is that it was very quiet. It had none of that echo that half finished houses have. If internal walls were constructed similar to the external ones, then sound transmission may not be a problem. Worth investigating I think.

Isn't that 6 foot

One way to put a number, but it would be unitless, is to assume a house that changes temperature in step with any energy input, is given the number 1. A house that does not change temperature, no matter what energy input is given to it, is given the number 0. We could, for a laugh, call 1 Annabelle and 0 Barbara, we we dislike numbers. Though it would make subdivisions a bit tricky i.e. a Barbara Barbara Annabelle, or Annabelle Barbara Annabelle. This would still require some testing and a lot of data collection. And then another unitless number to adjust for location, orientation, size, shape etc. Or we can just use the existing Thermal Inertia formula. That can give us a number of answers regardless of which parts are missing, it is what simultaneous equations are for. I don't know why it is not used, probably ignorance.

I never wear any, the reduced mass of water that is saved by not cleaning them is, just one, of my contributions to the world.

FFS, go back and look at the figures I posted up, if they are calculated correctly, there is little difference. If just brick or concrete were the answer, why do you need to add insulation? I can answer that, but I want you to, then you might start to realise that the mass is not the be all, and end all, of thermal stability.

Was it always cold. Just teasing, I don't give two hoots really. But just for a giggle, did it have a low glass to wall ratio?

Not in your world, it is thermal conductivity that adds the time in. It is all in the units, ignore them at your peril.

But that is exactly what people think it does do, why this whole conversation started. People thinking that mass adds to thermal stability.

That is speed isn't it.

Mass is just the count of 'stuff' in an object. So no way am I saying that mass does not exist. This is getting absurd, but I am going out as it is sunny. Next time you are in a meeting and someone mentions the benefits of thermal mass, you will remember all this, and then question if what they are saying makes sense.

I don't think that you understand that you have to include all elements to have something useful, you can't pick and choose just one or two.

So what are you defining then, seems to be just mass, as without time, you cannot have any change.

But totally missunderstood because people think it is the mass that is the key element. That is like saying my Ford C-Max is more stable than a Ford Focus because it is heavier. Total nonsense. Been answered. That is because you don't understand it too. Sorry if that sounds personal, but no other way to say it.

Yes, the analysis has to include thermal conductivity as well, but that's a separate factor, and I think needs to be kept separate, if only to remind people that you can have two thermal elements with the same U-value, but widely differing thermal mas (or thermal inertia... or whatever you choose to call it), and as a result they will perform differently in terms of transient thermal response. Copied straight from good old Wikipedia, with minor editing to make it legible. The main point is that thermal conductivity is very important and not a separate factor. Thermal inertia[edit] Thermal inertia is a term commonly used for modelling heat transfers. It is a bulk material property related to thermal conductivity and volumetric heat capacity. For example, "this material has a high thermal inertia", or "thermal inertia plays an important role in this system", mean that dynamic effects are prevalent in a model, so that a steady-state calculation will yield inaccurate results. The term is a scientific analogy, and is not directly related to the mass-and-velocity term used in mechanics, where inertia is that which limits the acceleration of an object. In a similar way, thermal inertia is a measure of the thermal mass and the velocity of the thermal wave which controls the surface temperature of a material. In heat transfer, a higher value of the volumetric heat capacity means a longer time for the system to reach equilibrium. The thermal inertia of a material is defined as the square root of the product of the material's bulk thermal conductivity and volumetric heat capacity, where the latter is the product of density and specific heat capacity: I = (k.p.c)0.5 See also thermal effusivity k is thermal conductivity, with unit [W m−1 K−1] p is density, with unit [kg m−3] c is specific heat capacity, with unit [J kg−1 K−1] I has SI units of thermal inertia of [J m−2 K−1 s−1/2]. Non-SI units of Kieffers [Cal cm−2 K−1 s−1/2] or [1000 Cal cm−2 K−1 s−1/2] are also used informally in older references.[5][6] For planetary surface materials, thermal inertia is the key property controlling the diurnal and seasonal surface temperature variations and is typically dependent on the physical properties of near-surface geologic materials. In remote sensing applications, thermal inertia represents a complex combination of particle size, rock abundance, bedrock outcropping and the degree of induration. A rough approximation to thermal inertia is sometimes obtained from the amplitude of the diurnal temperature curve (i.e., maximum minus minimum surface temperature). The temperature of a material with low thermal inertia changes significantly during the day, while the temperature of a material with high thermal inertia does not change as drastically. Deriving and understanding the thermal inertia of the surface can help to recognize small-scale features of that surface. In conjunction with other data, thermal inertia can help to characterize surface materials and the geologic processes responsible for forming these materials. Thermal inertia of the oceans is a major factor influencing climate commitment, the degree of global warming predicted to eventually result from a step change in climate forcing, such as a fixed increase in the atmospheric concentration of a greenhouse gas. But if you are in a meeting about this, and you hear people using the incorrect term, and showing little understanding of the subject, one tends to loose confidence in them.

It was, in reality, a 1/3rd more to pay each month as we were starting from around 10%. So it would be similar to rates going from 5% to 6.5%. And it was fairly short lived. We were used to the interest rates fluctuating on a regular basis back then. It was used as a political tool. At the same time, the country was considering entering the Euro zone, this destabalised the value of our currency against others. Sometimes it was stronger, other times weaker. Fiscally it was all a bit of a mess.

Yep that's it. Thanks.

There was a bit on the Radio last week where they discussed connected homes. They had some industry experts on it. Can't remember what show it was, possibly You and Yours. May be worth a search on the Radio 4 website. I think the take home message was 'don't'

Trust is what is required.

My neighbour paid 85k September 8 for an identical house to mine (except my garage was attached, his was in a block, borrowed 10k to put a new kitchen in, then had it repossessed in 91. It sold for 38k, in 93 the same price I paid for mine in 86. What a nob. Even at the time I knew it was way over priced. The price I paid was 3 times my wage at the time. I suspect, knowing what he did for a job and where he worked, that he borrowed 6 times his wage. I think mortgage rates were about 10% then.

By giving a few months notice that MIRAS on two incomes was ending caused a property boom in 1989. I think my mortgage was down from £30,000 to £26,000 as I had overpaid. I had a standard, variable, repayment mortgage. By 1991, when rates went up for a few weeks, my mortgage was even less, but I did loose my job, so was 'on the dole'. My sister, who had started with a £12,000 mortgage a few years earlier than me had an endowment mortgage, one that was fixed rate for 12 month, then fixed again for 12 months and so forth, and she borrowed extra cash against her house to buy a car. She did not put money aside when rates when up, so paid a heavy price the next year. Then she found out the endowment was under performing. So had to pump more cash in. Eventually she should up, at a huge 'profit' and moved. She got a repayment mortgage. I eventually paid my mortgage off 20 years ago. Was a good feeling. With property, cash is king, never run out of it.

Thermal Inertia is really just how a capacitor charges and discharges. So knowing that, where do you stand?

There is a saying that the milk should never, ever, touch the tea before the water. Not sure how that is going to help decide between construction methods, but I find that tea helps the thought process no end.