Simon Gardner wrote:

Whilst I understand that old-style single or double glazing may be
direction of heat-transfer neutral - what about the newer glasses now
compulsory in double glazing? Does this in any way act in a one-way manner
so as to exacerbate the heating effects of a lot of sun as compared with
older glazing?





I think not. The idea is to keep heat in in winter and out in summer.

Its not made, and cannot I think BE made, directional.

Simon Gardner wrote:

In article ,
The Natural Philosopher wrote:


Simon Gardner wrote:


Whilst I understand that old-style single or double glazing may be
direction of heat-transfer neutral - what about the newer glasses now
compulsory in double glazing? Does this in any way act in a one-way manner
so as to exacerbate the heating effects of a lot of sun as compared with
older glazing?

I think not. The idea is to keep heat in in winter and out in summer.

Its not made, and cannot I think BE made, directional.


I'm sure with the right coatings it can be made directional. I'm reassured
to know it isn't.



Not to conduction it can't. radiation may be a different matter tho.

However heat loss is mostly conduction/convetion. Heat gain may be
radiation.

Simon Gardner wrote:

Whilst I understand that old-style single or double glazing may be
direction of heat-transfer neutral - what about the newer glasses now
compulsory in double glazing? Does this in any way act in a one-way manner
so as to exacerbate the heating effects of a lot of sun as compared with
older glazing?

I don't think there is anything directional about the glass, but you may
get some directionality if the sun is shining in through the window as a
result of the "greenhouse effect".

--
Cheers,

John.

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