to give the same insulation as modern cavity wall.
Let's assume its mainly built of limestone?
Those castles were around 1-2m think in places. I was womndering HOW
think it would have to be to offer - say - a U value of 0.3.
The White Tower in the Tower of London is 12-15 feet.
The absence of anything in the window holes, except sometimes a wooden
shutter to stop the worst of the wind, would probably be a more important
factor. In any case, there was no attempt to heat the whole room. Like a
1950s home in Britain, if you wanted to be warm, you put extra clothing on
and/or moved closer to the fire.
They may have been sufficiently massive to provide some sort of thermal
equilibrium. We often used the structure of a building for thermal storage in
our energy management projects. And none were anything like as impressive or
thermally massive as a castle.
So they may have had a cool environment in summer and a warm one in winter, when
compared to outside ambient. I suppose the Tower of London, as you quoted, can
best tell us if this is true.
From the chaotic regions of the Cryptosphere, The Natural Philosopher
The current maximum U-value is 0.35W/m²K.
This gives an R-value of (1/0.35) = 2.857m²K/W, so removing the R for
surface resistances (0.13 & 0.06) & internal plaster (0.06) gives a
minimum required R-value of 2.607m²K/W.
The conductivity of limestone is 1.13W/mK, so multiply that by the
resistance required (1.13 x 2.607) = 2.95m.
You may be able to argue for a slight reduction with the Building
Control Officer as these old castles had very little windows (or
arrow-slits) And of course, burning peasants could be classed as a
"You know, I'd rather see this on TV,
So lets just resatet this.
3 meters of castle wall is as good as any house today? Ignoring
windows....which were small, and in any case if reasonably tight fitting
thick shutters and/or heavy tapestries were used, as good as double
AND of course the castle would settle down to an avearge ambient
temperature and stay there due to its massive thermal inertia. Probably
take a week to get warm after lighting the fires in winter. Likewise in
weather like todays, it would settle to somewhere between day and night
temps - say about 25C instead of 35, or 15.....
I think he would have something to say about the oubliettes tho :-(
I have also thought hard about some of the passage graves and long
barrow type tombs. It seems to me that a few feet of earth is probably
pretty good as well - the biggest hassle being heating and ventilation.
BUT if you stick all the animals in as well, thats a shitload of heat
A cow has to be worth 500W at least. And you could burn the shit.
One suspects these guys found something that worked.
I never could understand how thw upper crust confined themselves
to damp cold draughty stone buildings, but...it would seem
they probably were not any of those.
Except the dungeons, which probably were all of those :-)
On Sun, 10 Aug 2003 20:16:04 +0100, Steve Firth wrote:
Same here, nothing like a good bit of solid thermal mass to stabilise
internal temperatures. Yesterday was the hottest I've recorded up
here, 31.4C outside, after a steady 15C overnight. The living room
temperature changed from 22C early morning to 25C by late afternoon.
Dave. pam is missing e-mail
Temp: Very comfortable - well ventilated and well insulted.
Bill: approx £250 for gas which is CH, DHW and gas hob. The CH is only
setback ay night in winter time. I think £250 is too much and I ma working
to get that down.
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