url:http://www.buy4now.ie/woodiesdiy/pro...=P&catid=110.0

Reflecting cold? That's an interesting concept.

On Tue, 08 Nov 2011 01:38:12 +0000, Grimly Curmudgeon wrote:

url:http://www.buy4now.ie/woodiesdiy/productdetail.aspx?
pid=14046&loc=P&catid=110.0

Reflecting cold? That's an interesting concept.

It's like photocopying cold to make it warmer...

Jules Richardson wrote:

On Tue, 08 Nov 2011 01:38:12 +0000, Grimly Curmudgeon wrote:

url:http://www.buy4now.ie/woodiesdiy/productdetail.aspx?
pid=14046&loc=P&catid=110.0

Reflecting cold? That's an interesting concept.

It's like photocopying cold to make it warmer...

Perhaps it comes from the same school of thought that tells us
electric current flows in the opposite direction to the
electrons.

Chris
--
Chris J Dixon Nottingham UK


Have dancing shoes, will ceilidh.

"Chris J Dixon" wrote in message
...
Jules Richardson wrote:

On Tue, 08 Nov 2011 01:38:12 +0000, Grimly Curmudgeon wrote:

url:http://www.buy4now.ie/woodiesdiy/productdetail.aspx?
pid=14046&loc=P&catid=110.0

Reflecting cold? That's an interesting concept.

It's like photocopying cold to make it warmer...

Perhaps it comes from the same school of thought that tells us
electric current flows in the opposite direction to the
electrons.

Oh come on, everyone knows its the holes that go that way.

In message m,
"dennis@home" writes


"Chris J Dixon" wrote in message
.. .
Jules Richardson wrote:

On Tue, 08 Nov 2011 01:38:12 +0000, Grimly Curmudgeon wrote:

url:http://www.buy4now.ie/woodiesdiy/productdetail.aspx?
pid=14046&loc=P&catid=110.0

Reflecting cold? That's an interesting concept.

It's like photocopying cold to make it warmer...

Perhaps it comes from the same school of thought that tells us
electric current flows in the opposite direction to the
electrons.

Oh come on, everyone knows its the holes that go that way.

And that light bulbs work by sucking the darkness in.
--
Ian

On Tue, 8 Nov 2011 21:02:32 +0000
Ian Jackson wrote:

In message m,
"dennis@home" writes


"Chris J Dixon" wrote in message
.. .
Jules Richardson wrote:

On Tue, 08 Nov 2011 01:38:12 +0000, Grimly Curmudgeon wrote:

url:http://www.buy4now.ie/woodiesdiy/productdetail.aspx?
pid=14046&loc=P&catid=110.0

Reflecting cold? That's an interesting concept.

It's like photocopying cold to make it warmer...

Perhaps it comes from the same school of thought that tells us
electric current flows in the opposite direction to the
electrons.

Oh come on, everyone knows its the holes that go that way.

And that light bulbs work by sucking the darkness in.

I think it's time to resurrect the Phlogiston theory.
--
Davey.

Ian Jackson wrote:
In message m,
"dennis@home" writes


"Chris J Dixon" wrote in message
...
Jules Richardson wrote:

On Tue, 08 Nov 2011 01:38:12 +0000, Grimly Curmudgeon wrote:

url:http://www.buy4now.ie/woodiesdiy/productdetail.aspx?
pid=14046&loc=P&catid=110.0

Reflecting cold? That's an interesting concept.

It's like photocopying cold to make it warmer...

Perhaps it comes from the same school of thought that tells us
electric current flows in the opposite direction to the
electrons.

Oh come on, everyone knows its the holes that go that way.

And that light bulbs work by sucking the darkness in.

*shrug* Its a theory. But really, what isn't?

(serious deep question)

On Tue, 08 Nov 2011 07:58:25 -0000, dennis@home wrote:



"Chris J Dixon" wrote in message
...
Jules Richardson wrote:

On Tue, 08 Nov 2011 01:38:12 +0000, Grimly Curmudgeon wrote:

url:http://www.buy4now.ie/woodiesdiy/productdetail.aspx?
pid=14046&loc=P&catid=110.0

Reflecting cold? That's an interesting concept.

It's like photocopying cold to make it warmer...

Perhaps it comes from the same school of thought that tells us
electric current flows in the opposite direction to the
electrons.

Oh come on, everyone knows its the holes that go that way.

Of course, have you never watched Bugs Bunny?

--
http://petersparrots.com
http://petersphotos.com

What do bungee jumping and sex with a prostitute have in common?
1) They both cost about $100.
2) They both last about 30 seconds.
3) In both cases, if the rubber breaks, you're a dead man.

On Tue, 08 Nov 2011 02:34:17 -0000, Jules Richardson wrote:

On Tue, 08 Nov 2011 01:38:12 +0000, Grimly Curmudgeon wrote:

url:http://www.buy4now.ie/woodiesdiy/productdetail.aspx?
pid=14046&loc=P&catid=110.0

Reflecting cold? That's an interesting concept.

It's like photocopying cold to make it warmer...

I've photocopied paper to make more of it. I'm telling you it works. Saves me buying my own. Let it grow its own babies!

--
http://petersparrots.com
http://petersphotos.com

Those who get too big for their britches will be exposed in the end.

Does not sound very scientific does it.

At that rate I could make a very interesting refrigerator.
Brian

--
Brian Gaff -
Note:- In order to reduce spam, any email without 'Brian Gaff'
in the display name may be lost.
Blind user, so no pictures please!
"Grimly Curmudgeon" wrote in message
...
url:http://www.buy4now.ie/woodiesdiy/pro...=P&catid=110.0

Reflecting cold? That's an interesting concept.

On 08/11/2011 01:38, Grimly Curmudgeon wrote:
url:http://www.buy4now.ie/woodiesdiy/pro...=P&catid=110.0

Reflecting cold? That's an interesting concept.

Reminds me. Under the lounge window we have a radiator about 8 feet long
with a solid 9 inch block wall behind it. Could do with some reflective
insulating stuff behind it.

On Tue, 08 Nov 2011 08:35:24 +0000
Hugh - Was Invisible wrote:

On 08/11/2011 01:38, Grimly Curmudgeon wrote:
url:http://www.buy4now.ie/woodiesdiy/pro...=P&catid=110.0

Reflecting cold? That's an interesting concept.

Reminds me. Under the lounge window we have a radiator about 8 feet
long with a solid 9 inch block wall behind it. Could do with some
reflective insulating stuff behind it.

I need some as well, but I can't find any that is thin enough to slip
back there. It's either too thick and won't fit, or comes in a roll from
the kitchen dept. of Morrisons. Maybe I need to start glueing foil to
cardboard.
--
Davey.

On 08/11/2011 09:47, Davey wrote:
On Tue, 08 Nov 2011 08:35:24 +0000
Hugh - Was wrote:

On 08/11/2011 01:38, Grimly Curmudgeon wrote:
url:http://www.buy4now.ie/woodiesdiy/pro...=P&catid=110.0

Reflecting cold? That's an interesting concept.

Reminds me. Under the lounge window we have a radiator about 8 feet
long with a solid 9 inch block wall behind it. Could do with some
reflective insulating stuff behind it.

I need some as well, but I can't find any that is thin enough to slip
back there. It's either too thick and won't fit, or comes in a roll from
the kitchen dept. of Morrisons. Maybe I need to start glueing foil to
cardboard.

You want the version that comes in squares about 60cm on a side and 2mm
thick. There is a roll version about 1mm thick that is not as good, It
is surprisingly effective used on outside walls behind radiators.

It should be in season now next to rockwool and other insulation in
B&Q/Wickes. Obvious keywords should get it.

--
Regards,
Martin Brown

On Tue, 08 Nov 2011 11:38:46 +0000
Martin Brown wrote:

On 08/11/2011 09:47, Davey wrote:
On Tue, 08 Nov 2011 08:35:24 +0000
Hugh - Was wrote:

On 08/11/2011 01:38, Grimly Curmudgeon wrote:
url:http://www.buy4now.ie/woodiesdiy/pro...=P&catid=110.0

Reflecting cold? That's an interesting concept.

Reminds me. Under the lounge window we have a radiator about 8 feet
long with a solid 9 inch block wall behind it. Could do with some
reflective insulating stuff behind it.

I need some as well, but I can't find any that is thin enough to
slip back there. It's either too thick and won't fit, or comes in a
roll from the kitchen dept. of Morrisons. Maybe I need to start
glueing foil to cardboard.

You want the version that comes in squares about 60cm on a side and
2mm thick. There is a roll version about 1mm thick that is not as
good, It is surprisingly effective used on outside walls behind
radiators.

It should be in season now next to rockwool and other insulation in
B&Q/Wickes. Obvious keywords should get it.


Thanks! I looked a few weeks ago, and did not see that on the
manufacturers' websites. Maybe it's a seasonal thing.
Thanks again.
--
Davey.

On Tue, 08 Nov 2011 11:38:46 -0000, Martin Brown wrote:

On 08/11/2011 09:47, Davey wrote:
On Tue, 08 Nov 2011 08:35:24 +0000
Hugh - Was wrote:

On 08/11/2011 01:38, Grimly Curmudgeon wrote:
url:http://www.buy4now.ie/woodiesdiy/pro...=P&catid=110.0

Reflecting cold? That's an interesting concept.

Reminds me. Under the lounge window we have a radiator about 8 feet
long with a solid 9 inch block wall behind it. Could do with some
reflective insulating stuff behind it.

I need some as well, but I can't find any that is thin enough to slip
back there. It's either too thick and won't fit, or comes in a roll from
the kitchen dept. of Morrisons. Maybe I need to start glueing foil to
cardboard.

You want the version that comes in squares about 60cm on a side and 2mm
thick. There is a roll version about 1mm thick that is not as good, It
is surprisingly effective used on outside walls behind radiators.

It should be in season now next to rockwool and other insulation in
B&Q/Wickes. Obvious keywords should get it.

Why are they called radiators when they are primarily convectors?

--
http://petersparrots.com
http://petersphotos.com

I imposed a declaration in opposition to your motion to modify the preliminary injunction in support of the cross motion to vacate the preliminary injunction. So noted by the Federal Court of Justice proceeding preliminary declaration.

On 10/11/2011 20:30, Lieutenant Scott wrote:

Why are they called radiators when they are primarily convectors?

ISTR that it is roughly even stephen but can't remember whether the
information relates to modern panel radiators or the old fashioned
monster cast iron ones which were the original radiators.
--
Roger Chapman

On Nov 8, 9:47*am, Davey wrote:
On Tue, 08 Nov 2011 08:35:24 +0000
Hugh - Was Invisible wrote:

On 08/11/2011 01:38, Grimly Curmudgeon wrote:
url:http://www.buy4now.ie/woodiesdiy/pro...=14046&loc=P&c...

Reflecting cold? That's an interesting concept.

Reminds me. Under the lounge window we have a radiator about 8 feet
long with a solid 9 inch block wall behind it. Could do with some
reflective insulating stuff behind it.

I need some as well, but I can't find any that is thin enough to slip
back there. It's either too thick and won't fit, or comes in a roll from
the kitchen dept. of Morrisons. Maybe I need to start glueing foil to
cardboard.
--
Davey.

Even this stuff?
http://www.toolstation.com/shop/Cons.../sd2738/p26805
It's only about 3 or 4 mm thick. If your radiator is that close to
the wall it needs mounting further way to allow airflow up the back.

Andrew

On Tue, 8 Nov 2011 07:16:56 -0800 (PST)
1970alr wrote:

On Nov 8, 9:47Â*am, Davey wrote:
On Tue, 08 Nov 2011 08:35:24 +0000
Hugh - Was Invisible wrote:

On 08/11/2011 01:38, Grimly Curmudgeon wrote:
url:http://www.buy4now.ie/woodiesdiy/pro...=14046&loc=P&c...

Reflecting cold? That's an interesting concept.

Reminds me. Under the lounge window we have a radiator about 8
feet long with a solid 9 inch block wall behind it. Could do with
some reflective insulating stuff behind it.

I need some as well, but I can't find any that is thin enough to
slip back there. It's either too thick and won't fit, or comes in a
roll from the kitchen dept. of Morrisons. Maybe I need to start
glueing foil to cardboard.
--
Davey.

Even this stuff?
http://www.toolstation.com/shop/Cons.../sd2738/p26805
It's only about 3 or 4 mm thick. If your radiator is that close to
the wall it needs mounting further way to allow airflow up the back.

Andrew

Thanks, that looks good. They don't actually say how thick it is, just
the l x w dimensions, but 3 or 4 mm would be fine.
Having lived in the US until recently, I don't know the places to look
for stuff over here yet, so guidance is appreciated.
--
Davey.

On Tue, 8 Nov 2011 09:47:13 +0000, Davey wrote:

On Tue, 08 Nov 2011 08:35:24 +0000
Hugh - Was Invisible wrote:

On 08/11/2011 01:38, Grimly Curmudgeon wrote:
url:http://www.buy4now.ie/woodiesdiy/pro...=P&catid=110.0

Reflecting cold? That's an interesting concept.

Reminds me. Under the lounge window we have a radiator about 8 feet
long with a solid 9 inch block wall behind it. Could do with some
reflective insulating stuff behind it.

I need some as well, but I can't find any that is thin enough to slip
back there. It's either too thick and won't fit, or comes in a roll from
the kitchen dept. of Morrisons. Maybe I need to start glueing foil to
cardboard.

http://www.toolstation.com/shop/Cons.../sd2738/p26805

Put some behind the rads. last year.
Needs a good adhesive as it doesn't transmit much vapour.
--
Peter.
The gods will stay away
whilst religions hold sway

On Nov 8, 9:47*am, Davey wrote:
On Tue, 08 Nov 2011 08:35:24 +0000
Hugh - Was Invisible wrote:

On 08/11/2011 01:38, Grimly Curmudgeon wrote:
url:http://www.buy4now.ie/woodiesdiy/pro...=14046&loc=P&c...

Reflecting cold? That's an interesting concept.

Reminds me. Under the lounge window we have a radiator about 8 feet
long with a solid 9 inch block wall behind it. Could do with some
reflective insulating stuff behind it.

I need some as well, but I can't find any that is thin enough to slip
back there. It's either too thick and won't fit, or comes in a roll from
the kitchen dept. of Morrisons. Maybe I need to start glueing foil to
cardboard.
--
Davey.

Even this stuff?
http://www.toolstation.com/shop/Cons.../sd2738/p26805
It's only about 3 or 4 mm thick. If your radiator is that close to
the wall it needs mounting further way to allow airflow up the back.

Andrew

Surely what you need is a heat pip behind it attached to a large black lump
of something then you can just stick a radiator on the other end and slavage
the lost heat... Well its as scientific as the thread title!

Brian

--
Brian Gaff -
Note:- In order to reduce spam, any email without 'Brian Gaff'
in the display name may be lost.
Blind user, so no pictures please!
"Davey" wrote in message
...
On Tue, 08 Nov 2011 08:35:24 +0000
Hugh - Was Invisible wrote:

On 08/11/2011 01:38, Grimly Curmudgeon wrote:
url:http://www.buy4now.ie/woodiesdiy/pro...=P&catid=110.0

Reflecting cold? That's an interesting concept.

Reminds me. Under the lounge window we have a radiator about 8 feet
long with a solid 9 inch block wall behind it. Could do with some
reflective insulating stuff behind it.

I need some as well, but I can't find any that is thin enough to slip
back there. It's either too thick and won't fit, or comes in a roll from
the kitchen dept. of Morrisons. Maybe I need to start glueing foil to
cardboard.
--
Davey.

Hugh - Was Invisible wrote:

On 08/11/2011 01:38, Grimly Curmudgeon wrote:
url:

http://www.buy4now.ie/woodiesdiy/pro...=P&catid=110.0

Reflecting cold? That's an interesting concept.

Reminds me. Under the lounge window we have a radiator about 8 feet
long with a solid 9 inch block wall behind it. Could do with some
reflective insulating stuff behind it.

A friend of ours, no really, used some wide aluminiumium cooking foil,
just draped and stuffed it down as best he could .. it worked so well
he did it all over his house!

--
Paul - xxx
"You know, all I wanna do is race .. and all I wanna do is win"
Mark Cavendish, World Champion 2011.

On Tue, 08 Nov 2011 08:35:24 -0000, Hugh - Was Invisible wrote:

On 08/11/2011 01:38, Grimly Curmudgeon wrote:
url:http://www.buy4now.ie/woodiesdiy/pro...=P&catid=110.0

Reflecting cold? That's an interesting concept.

Reminds me. Under the lounge window we have a radiator about 8 feet long
with a solid 9 inch block wall behind it. Could do with some reflective
insulating stuff behind it.

Ahhhhhh, I've been fitting the reflective side inwards, how stupid of me.

--
http://petersparrots.com
http://petersphotos.com

The only intuitive user interface is the nipple.

On Nov 8, 1:38*am, Grimly Curmudgeon
wrote:
url:http://www.buy4now.ie/woodiesdiy/pro...=14046&loc=P&c...

Reflecting cold? That's an interesting concept.

On the other hand, being sat next to a cold surface is uncomfortable.

In message
,
harry writes
On Nov 8, 1:38*am, Grimly Curmudgeon
wrote:
url:http://www.buy4now.ie/woodiesdiy/pro...=14046&loc=P&c...

Reflecting cold? That's an interesting concept.

On the other hand, being sat next to a cold surface is uncomfortable.

Apparently.

My wife has what must politely be called a *substantial* nose. Seated in
front of our lounge TV, I often find her face shrouded in a scarf.

We have large window openings to either side and the loss of radiated
heat causes her some discomfort.

Somebody once tried to explain *black body* radiation to me. AFAIR
everything absorbs incident radiation at infra red wavelengths and then
re-radiates it. The walls bounce back all they receive but the windows
do not absorb much and consequently feel cold.

One of our physicists may explain it better:-)

regards

--
Tim Lamb

On 08/11/2011 10:16, Tim Lamb wrote:

Reflecting cold? That's an interesting concept.

On the other hand, being sat next to a cold surface is uncomfortable.

Apparently.

My wife has what must politely be called a *substantial* nose. Seated in
front of our lounge TV, I often find her face shrouded in a scarf.

We have large window openings to either side and the loss of radiated
heat causes her some discomfort.

Somebody once tried to explain *black body* radiation to me. AFAIR
everything absorbs incident radiation at infra red wavelengths and then
re-radiates it. The walls bounce back all they receive but the windows
do not absorb much and consequently feel cold.

One of our physicists may explain it better:-)

IANAP

I am more than a little rusty on this so may have a few of the niceties
wrong but AIUI:

Black bodies are so called because they absorb and radiate all
frequencies. In the real world most objects reflect some frequencies
rather than absorbing them (they must do one or the other) which is why
we have coloured objects.

All objects above absolute zero radiate to some extent, even cold walls
and substantial noses. Such radiation varies with the forth power of
absolute temperature so you get quite a noticeable difference even with
relatively minor differences in temperature.

Some surfaces radiate much better than others as anyone with a
thermometer that uses infra red should have learned by now. I can get
good reading from painted radiators but have to stick on a bit of black
tape to get much response from copper pipes (a matter of emissivity I
believe).

Glass reflects so it will radiate comparatively little so windows should
appear colder. They should usually also feel colder to the touch as even
double glazing tends to be a worse insulator than all but thinnest of
solid walls.

All this off the top of my head so take it with a pinch of salt until a
real scientist comes along and pulls it apart.

--
Roger Chapman

On Tue, 08 Nov 2011 12:43:59 +0000, Roger Chapman wrote:

Glass reflects so it will radiate comparatively little so windows should
appear colder.

Glass is complicated in that it's transmission/reflection abilties
varies with IR frequency. I *think* glass will transmit the higher
frequency IR radiation but reflect the lower. So sunlight with high
levels of HF IR gets through this is absorbed by objects behind the
glass which reraditates it at lower freqencies which the glass
reflects. This is how greenhouses work...

They should usually also feel colder to the touch as even double glazing
tends to be a worse insulator than all but thinnest of solid walls.

Yep, and in the context of IR radiation anything that does go through
isn't likely to come back.

--
Cheers
Dave.

On 8/11/2011 11:16 p.m., Tim Lamb wrote:
In message
,
harry writes
On Nov 8, 1:38 am, Grimly Curmudgeon
wrote:
url:http://www.buy4now.ie/woodiesdiy/pro...=14046&loc=P&c...


Reflecting cold? That's an interesting concept.

On the other hand, being sat next to a cold surface is uncomfortable.

Apparently.

My wife has what must politely be called a *substantial* nose. Seated in
front of our lounge TV, I often find her face shrouded in a scarf.

We have large window openings to either side and the loss of radiated
heat causes her some discomfort.

Somebody once tried to explain *black body* radiation to me. AFAIR
everything absorbs incident radiation at infra red wavelengths and then
re-radiates it. The walls bounce back all they receive but the windows
do not absorb much and consequently feel cold.

One of our physicists may explain it better:-)

regards


In this case feeling cold is more related to the conducting properties
of the glass. If instead of glass you had a sheet of steel it would
feel just as cold, since what you are feeling is basically the
temperature outside. In both cases the temperature drop across the
sheet is quite small. The temperature in the room is determined by
(among other things) the sum of the amount of radiant heat going out the
window and the amount of heat conduction through the window. With steel
instead of glass the conduction would be more, but the radiant loss
would be zero. It's not clear (to me) without doing some calculations
which would make the room warmer, but I suspect that the conduction loss
dominates.

In article , Grimly
Curmudgeon writes
url:http://www.buy4now.ie/woodiesdiy/pro...46&loc=P&catid
=110.0

Reflecting cold? That's an interesting concept.

That is MBS of course but if these products are installed in their very
specific and controlled operating environment then they do operate in 2
ways that are equivalent to the what was quoted:

1. They reflect heat back into the room (on the inside)

2. They oppose radiation of heat to the outside world (the cold side)

Whether they provide these features effectively in everyday
installations is another matter and it is an issue that I have actively
questioned here in the past.

These product are required to be installed with a draught free cavity on
both inside and outside, and specifically rely on the reflective surface
remaining free from dirt for the life of the installation. I regard both
of these conditions as highly unlikely to be achieved in typical
installations and have been achieved in precisely none on the
installations I have witnessed these products in use.

In short, waste of money, barely more effective than a cheap layer of
ordinary bubble wrap in the same space. Better still, use some real,
proven insulation such as PIR foam. Expensive snake oil.
--
fred
it's a ba-na-na . . . .

On 9/11/2011 3:33 a.m., fred wrote:

That is MBS of course but if these products are installed in their very
specific and controlled operating environment then they do operate in 2
ways that are equivalent to the what was quoted:

1. They reflect heat back into the room (on the inside)

2. They oppose radiation of heat to the outside world (the cold side)

Whether they provide these features effectively in everyday
installations is another matter and it is an issue that I have actively
questioned here in the past.

These product are required to be installed with a draught free cavity on
both inside and outside, and specifically rely on the reflective surface
remaining free from dirt for the life of the installation. I regard both
of these conditions as highly unlikely to be achieved in typical
installations and have been achieved in precisely none on the
installations I have witnessed these products in use.

In short, waste of money, barely more effective than a cheap layer of
ordinary bubble wrap in the same space. Better still, use some real,
proven insulation such as PIR foam. Expensive snake oil.

Sounds about right, and consistent with the MBS.

On 8/11/2011 2:38 p.m., Grimly Curmudgeon wrote:
url:http://www.buy4now.ie/woodiesdiy/pro...=P&catid=110.0

Reflecting cold? That's an interesting concept.

If heat is infra-red EM radiation, what is cold, I wonder?

On Nov 8, 9:16*pm, Gib Bogle wrote:
On 8/11/2011 2:38 p.m., Grimly Curmudgeon wrote:

url:http://www.buy4now.ie/woodiesdiy/pro...=14046&loc=P&c...

Reflecting cold? That's an interesting concept.

If heat is infra-red EM radiation, what is cold, I wonder?

Cold is the absorption of heat isn't it - it's a heat sink.

The first winters in this cottage were pretty miserable - just as well
we were young. Possibly late 18th century build with 3 ft thick stone
walls, it was probably warmer when built than when it was upgraded in
the late 1920's to have a proper wooden floor and lathe and plaster on
the walls, but they didn't put two and two together that all the under
floor ventilating air just circulated up behind the L and P and out
through the rood space, so the room insulation was just 2cm of
plaster, above and all round; the basic coal fire would radiantly heat
your front and the walls just seemed to suck all your warmth away from
your back.

Rob

On Tue, 8 Nov 2011 14:38:58 -0800 (PST), robgraham
wrote:

On Nov 8, 9:16*pm, Gib Bogle wrote:
On 8/11/2011 2:38 p.m., Grimly Curmudgeon wrote:

url:http://www.buy4now.ie/woodiesdiy/pro...=14046&loc=P&c...

Reflecting cold? That's an interesting concept.

If heat is infra-red EM radiation, what is cold, I wonder?

Cold is the absorption of heat isn't it - it's a heat sink.

The first winters in this cottage were pretty miserable - just as well
we were young. Possibly late 18th century build with 3 ft thick stone
walls, it was probably warmer when built than when it was upgraded in
the late 1920's to have a proper wooden floor and lathe and plaster

ITYF it's "lath and plaster". A lathe is a machine for turning e.g.
wood or metal..


HTH

--
Frank Erskine

Gib Bogle wrote:
On 8/11/2011 2:38 p.m., Grimly Curmudgeon wrote:
url:http://www.buy4now.ie/woodiesdiy/pro...=P&catid=110.0


Reflecting cold? That's an interesting concept.

If heat is infra-red EM radiation, what is cold, I wonder?

A virus

On Wed, 09 Nov 2011 10:16:22 +1300, Gib Bogle
wrote:

Reflecting cold? That's an interesting concept.

If heat is infra-red EM radiation, what is cold, I wonder?

The purveyors of MBS, who were the ones who sat up the back of class
in Physics, passing notes, cracking jokes, and ogling the girls'
skirts by dropping pencils, probably think that 'cold' is some
negative-going quasi-waveform of metaphysical aether that crystal
theory can generate when rubbed with the skin of a dead cat in a box.
To these people, the concept of heat flows is utterly alien - they
didn't grasp it.

On Tue, 08 Nov 2011 10:41:15 +0000, Terry Fields wrote:

Grimly Curmudgeon wrote:

url:http://www.buy4now.ie/woodiesdiy/pro...=P&catid=110.0

Reflecting cold? That's an interesting concept.


These are not trivial amounts: the average human body receives about
400W of radiant heat from indoor surroundings, and radiates about 330W
in turn. To stay in heat balance, the difference of 70W is made up by
burning food by the body.

If the body receives 400 and emits 330 the temperature of the body would
rise until the themal losses = the gains at which time we would be in
thermal equilibrium :-) Zeroth law IIRC
--
(º€¢.¸(¨*€¢.¸ ¸.€¢*¨)¸.€¢Âº)
.€¢Â°€¢. Nik .€¢Â°€¢.
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On 9/11/2011 5:16 a.m., Ghostrecon wrote:
On Tue, 08 Nov 2011 10:41:15 +0000, Terry Fields wrote:

Grimly Curmudgeon wrote:

url:http://www.buy4now.ie/woodiesdiy/pro...=P&catid=110.0

Reflecting cold? That's an interesting concept.


These are not trivial amounts: the average human body receives about
400W of radiant heat from indoor surroundings, and radiates about 330W
in turn. To stay in heat balance, the difference of 70W is made up by
burning food by the body.

If the body receives 400 and emits 330 the temperature of the body would
rise until the themal losses = the gains at which time we would be in
thermal equilibrium :-) Zeroth law IIRC

In any case more heat is lost from the body by conduction-convection
than by radiation, I believe. Evaporative cooling (sweat) can also be
very significant.

On Wed, 09 Nov 2011 10:26:48 +1300, Gib Bogle wrote:

On 9/11/2011 5:16 a.m., Ghostrecon wrote:
On Tue, 08 Nov 2011 10:41:15 +0000, Terry Fields wrote:

Grimly Curmudgeon wrote:

url:http://www.buy4now.ie/woodiesdiy/pro...=P&catid=110.0

Reflecting cold? That's an interesting concept.


These are not trivial amounts: the average human body receives about
400W of radiant heat from indoor surroundings, and radiates about 330W
in turn. To stay in heat balance, the difference of 70W is made up by
burning food by the body.

If the body receives 400 and emits 330 the temperature of the body would
rise until the themal losses = the gains at which time we would be in
thermal equilibrium :-) Zeroth law IIRC

In any case more heat is lost from the body by conduction-convection
than by radiation, I believe. Evaporative cooling (sweat) can also be
very significant.

the method of heat transfer is not at issue - the body will come to thermal
equiibrium by whatever heat transfer mechanism :-)
--
(º€¢.¸(¨*€¢.¸ ¸.€¢*¨)¸.€¢Âº)
.€¢Â°€¢. Nik .€¢Â°€¢.
(¸.€¢Âº(¸.€¢Â¨* *¨€¢.¸)º€¢.¸)

On 10/11/2011 8:30 a.m., Ghostrecon wrote:
On Wed, 09 Nov 2011 10:26:48 +1300, Gib Bogle wrote:

These are not trivial amounts: the average human body receives about
400W of radiant heat from indoor surroundings, and radiates about 330W
in turn. To stay in heat balance, the difference of 70W is made up by
burning food by the body.

If the body receives 400 and emits 330 the temperature of the body would
rise until the themal losses = the gains at which time we would be in
thermal equilibrium :-) Zeroth law IIRC

In any case more heat is lost from the body by conduction-convection
than by radiation, I believe. Evaporative cooling (sweat) can also be
very significant.

the method of heat transfer is not at issue - the body will come to thermal
equiibrium by whatever heat transfer mechanism :-)

Of course. I was just pointing out that the focus on radiant heat is
misplaced.

On Wed, 09 Nov 2011 19:57:20 -0000, Gib Bogle wrote:

On 10/11/2011 8:30 a.m., Ghostrecon wrote:
On Wed, 09 Nov 2011 10:26:48 +1300, Gib Bogle wrote:

These are not trivial amounts: the average human body receives about
400W of radiant heat from indoor surroundings, and radiates about 330W
in turn. To stay in heat balance, the difference of 70W is made up by
burning food by the body.

If the body receives 400 and emits 330 the temperature of the body would
rise until the themal losses = the gains at which time we would be in
thermal equilibrium :-) Zeroth law IIRC

In any case more heat is lost from the body by conduction-convection
than by radiation, I believe. Evaporative cooling (sweat) can also be
very significant.

the method of heat transfer is not at issue - the body will come to thermal
equiibrium by whatever heat transfer mechanism :-)

Of course. I was just pointing out that the focus on radiant heat is
misplaced.

Which is why some people falsely believe you will freeze to death in space. More likely you will explode due to exceedingly high relative blood pressure.

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