Insulating Glass 2

[dik]

just received this:

CUIN insulating glass with suspended film is the most thermally efficient insulating glass unit (IGU) available on the market.It achieves centre pan U-values as low as 0.4 W/m²K in double glazed units.

CUIN technology will reduce the environmental impact of your building and reduce energy costs throughout the building’s life. It has low carbon footprint, is highly thermally efficient, will lower demands on HVAC, and provide a primary reduction in carbon dioxide emissions. CUIN negates the need for triple glazing. It eliminates triple glazing weight constraints to the framing system.

https://www.constructioncanada.net/...il&utm_source=newsletter&utm_content=products

I've not used it... and this is not an endorsement... just interesting... It's one of the better mags... (an endorsement)...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[r13]

Neat. I don't like the air space in the multiple panels installation. It leaks eventually before the frame rotten out.

 

[dik]

You need the 'air' space for thermal efficiency... often filled with argon, etc. New system can save a few pounds per sq.ft. due to the weight of the inner light.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[r13]

Doesn't the film replaces the air gap?

 

[Harbringer]

No the film (low E coating) reflects radiant heat, while the "air gap" insulates heat transfer due to conduction.

 

[r13]

I see. Thanks.

 

[dik]

It also reduced the depth of the 'air gap' to reduce convection loss.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[dik]

No the low-e coating is generally on surfaces 2 and 3 (and I don't know if the film would be surfaces 3 and 4 with the low-e on surface 5)... the outer surface of the outer glazing is surface 1 and the inside of the outer glazing is surface 2, and so forth. The film is completely different from the low-e film and is separate from the inner and outer glazing. From the article:

Low-e is great... I put in 28 windows in our place in Oshawa about 20 years back, using low-e triple glazing and in the winter you could stand infront of a window and not feel any cold from it... without the low-e, you could feel the cold even if argon filled.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[IRstuff]

Seems awfully thick at 32-mm; I guess it's not for residential windows.

The air gap is large enough that the suspended film is actually required to snuff the convective heat loss, but the suspended film acts like a third glazing unit, which is why they claim their double glaze is as good as a standard triple glaze. The challenge, it would seem, is to make the suspended film such that it does not distort the view with ripples, sag, etc.

It's apparently been around for a while, at least, as early as 2016:

https://www.glassonweb.com/news/introducing-innovative-cuin-insulated-glass-unit

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[dik]

Thanks IRS... first article was the first that I'd encountered it... hopefully they've addressed the items you mentioned... difficult to replace the film

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[IRstuff]

It's interesting, to be sure, but a bit hype-y; the reduction in weight is strictly from replacing the inner pane with the suspended film.

The earlier article has the identical figure, so no new work has been done on it in 4 years...

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[dik]

again, thanks...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[jjl317]

Years ago I worked for a company that had acquired a residential window manufacturer. This manufacturer had previously sold thousands of windows with a similar glass system (Heat Mirror?), but eventually had moved away from it due to problems (tears, waves etc.) in the film that would occur in the field (either during or after installation). We had moved everything to dual pane IG with better coatings on the interior face (i.e. Solarban 70), and better performing inert gases (argon, krypton).

This was a number of years ago, and perhaps these issues with the film have been addressed.

Not to even bring up something remotely political, but thermal performance in buildings is certainly topical, having been discussed in the recent US presidential debates, as part of the "Green New Deal".

Will be interesting to see if/how much this potential process of retrofitting existing buildings will actually occur. In my mind, it's very similar to other infrastructure projects, which here in the US we have neglected for years, so I am somewhat skeptical. And having been involved in some of these retrofit projects, I think it ends up being way more complicated that anyone want to admit.

 

[dik]

thanks... was aware of some of the issues... and cautioned that I didn't endorse the product, but, I found it interesting.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[canwesteng]

My pie in the sky hope is for some kind of aero gel to replace the gas in between panes in the future. Wouldn't have to worry about it leaking out, but I bet this is just fantasy.

 

[r13]

My vote goes for the elimination of air space.

 

[IRstuff]

Aerogel exists, but is quite expensive.

My vote goes for the elimination of air space.

It's the air space that does the insulating, which is why it's such a big deal. The issue in the past had been using air which has a higher thermal conductivity than krypton or argon. The thermal conductivity of the gas gap is a combination convection and conduction, and typically has a minimum total thermal conductivity around 13 mm at room temperature. Reducing the gap cranks up the conduction component, while increasing the gap cranks up the convection component. Introducing any physical barrier in the middle of the gap interferes with the convection flows, so the barrier is likewise positioned at ~13 mm from both interior surfaces of the two glass panes.

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[Compositepro]

Aerogel is highly porous and insulates well because it is mainly air and not silica (basically glass). Aerogel, fiberglass, and foam insulations all operate the same way; they are mostly gas with a low thermal conductivity. The rest is there to prevent gas movement (convection). For this reason, all these insulating materials work much better at preventing heat transfer downwards than upwards, and have different R ratings in these positions.

 

[IRstuff]

Aerogel has a bit of a cloudy appearance, which might be annoying, for a window:

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[r13]

It is what I see on my leaky window glass.