as far as i know you either have a vacuum or an inert gas as air allows the heat loss and sound to travel
simply 2 panes off glass are just that
why would they go to all the trouble and expence of sealed units if 2 panes would do the same job!!!
Drilling glass
- Thread starter men8ifr
- Start date
as far as i know you either have a vacuum or an inert gas as air allows the heat loss and sound to travel
simply 2 panes off glass are just that
why would they go to all the trouble and expence of sealed units if 2 panes would do the same job!!!
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A vacuum would crack/shatter the glass as the pressure differential acting on a sheet of glass would be enormous - I'd suspect even steel of the same thickness would bend with that much pressure on it!
Argon gas is only been used recently but U values are little different to air.
Air is a very good insulator - the problem being convection, conduction of air moving around - the 'sealed' double glazing simply stops the air moving (too much) and hence used its very good insulating properties to the desired effect.
If 2 panes of glass allowed the air to move freely around then yes it would be no better than 1 pane of glass.
But anyone know the answer to the drilling the glass!
Argon gas is only been used recently but U values are little different to air.
Air is a very good insulator - the problem being convection, conduction of air moving around - the 'sealed' double glazing simply stops the air moving (too much) and hence used its very good insulating properties to the desired effect.
If 2 panes of glass allowed the air to move freely around then yes it would be no better than 1 pane of glass.
But anyone know the answer to the drilling the glass!
why would you think that !!! the brake hoses on a vacuum braked train are only spirals of wire with canvas and or rubber inbetween and thats up to 31" of mercry !!!
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Hiya,
Have a look on here:-
http://en.wikipedia.org/wiki/Insulated_glazing
Does talk of IGU's having a partial vacuum between the panes of glass, also states that they are not repairable once the seal has gone.
Nick.
Have a look on here:-
http://en.wikipedia.org/wiki/Insulated_glazing
Does talk of IGU's having a partial vacuum between the panes of glass, also states that they are not repairable once the seal has gone.
Nick.
there is never a vacuum or partial vacuum in the sealed units available in this country. the wikipedia entry said that evacuated glazing was uncommonly available and has a partial vacuum. i'm not sure where it is available? it would certainly bend the glass of a normal sized unit. vacuum glazing does exist with spacers at close centres between the panes. not suitable for a domestic application though.
i hope someone can help this fellow with how to drill the glass? i know glaziers can do it, but i have been lead to believe it's a bit hit and miss, even on the bench. maybe you could ring a friendly one and get some advice?
of course his repair wouldn't be as good as a brand new properly constructed one - it's a repair. well done for trying i say, but i think the professional repairers generally drill through the edge spacer.
i hope someone can help this fellow with how to drill the glass? i know glaziers can do it, but i have been lead to believe it's a bit hit and miss, even on the bench. maybe you could ring a friendly one and get some advice?
of course his repair wouldn't be as good as a brand new properly constructed one - it's a repair. well done for trying i say, but i think the professional repairers generally drill through the edge spacer.
Pressure on a patio door lets say the area is 2m x 1m = 2m squared
Atmospheric pressure is 100000pascals (same as 1 bar, 14.5psi)
And pressure = force/area
so force = pressure x area
So force = 100000(pa) x 2m^2
Force = 20,000kg
or 20 tonnes pressing on the glass (evenly distributed)
I dont think the glass would stand that!
Brake hoses are cylindrical and hence a much stronger shape, the pressure is distributed evenly around the cylinder and sets up a circumferential force which is easy to withstand, also think how big is a brake hose, is it metres in diameter? no probably 10-20mm so the area is very small as well and the force exerted depends on the area (see above) finally as you mentioned they are either strong fibre or steel reinforced and the non-flexible sections are all steel pipe.
The wiki entry (as I read it) says partial vacuum glass is not used for commercial use, the strength needs to be improved (could mean much thicker glass, steel reinforcement etc) and the viewng area is quite small, plus the vacuum is only partial so could be anywhere from 20% to 80% of a total vacuum. - I guess this sort of thing would be used in commercial freezers etc where getting more insulation is important but there is a large temperature difference so thermal losses justify the extra cost (and poor visibility due to thick glass and/or reinforcements) - anyway aeroplane windows need to withstand around 1 bar (roughly) so that gives an idea on the size and thickness of glass possible (i.e. quite small)
To drill hole in glass, will need a diamond drill bit as above although you can use a ball shaped drill bit. Plenty of coolant to keep your drill tip cool with very light pressure
thanks - wish I had this answer earlier before I cracked one of the panes!
To drill hole in glass, will need a diamond drill bit as above although you can use a ball shaped drill bit. Plenty of coolant to keep your drill tip cool with very light pressure
To keep it cool, lay the glass down flat, build a wall around the area of the hole with putty, then fill that with the coolant/lubricant of your choice.
Nick.
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