"Blinds between glass" refers to an innovative window system that features blinds or shades that are permanently sealed Blinds between glass and the Myth of Energy Efficiency

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In a double-glazed cavity. Surprisingly, they have been there for a long time. According to Pella, one of the leading window manufacturers in America, they first introduced between glass blinds in 1966. This is only in recent years, however, They have grown in popularity to become a main window option for owners who love a clean and modern look and the idea of ​​minimal maintenance.

The companies that manufacture them cite their hygienic convenience, maintenance – free, uniform and elegant appearance and innovative sun protection and privacy features. With regard to owners with children or pets, their wireless design is a particularly attractive security feature. For people with allergies, elimination of dust drapes and airborn allergens seems to be an incentive to purchase.

But are they energy efficient? In these days when energy bills and resources are decreasing, both personal and planetary, the whole homeowner is most concerned about energy efficiency when purchasing doors Or replacement windows. This is the only issue that can be the victory of all the others, because no one wants to see their hard-earned dollars disappear through the window.

So, the question must be asked: Are the blinds between the windows and the doors really energetic? – Effective as the assert some? The only way to actually answer this question is to understand (a) what energy efficiency means in terms of windows and doors specifically and (b) how this type of window option is put in place .

Window and Door Efficiency Efficiency 101

Modern windows are smart windows, and the science of the window have completely changed the way we understand the " energetic efficiency. The measuring stick that we use to measure the energy efficiency of a window is indeed sophisticated.

We have known for some time that glass in itself is a poor insulator; However, double-panel windows have created a revolution in the window market. With double-glazed windows, the two pieces of glass seal an air layer between them, providing extra insulation.

But there has been another energy efficiency revolution in the horizon thanks to Low-E glass and argon gas. Low-E (low emissivity) is a thin coating of transparent metallic material applied to the glazing for insulating purposes. The Low-E coating avoids gaining heat (or loss) in your home by acting as a kind of reflective shield, pushing the radiant heat that tries to pass through the glass to the source from which it comes . Argon is a heavy, invisible and non – toxic gas that is a much better insulator than air: the weight of this gas greatly reduces the amount of heat that can go through the space between two windows.

Today's windows are largely energy efficient because of treated glass and the use of argon gas. By using stainless steel spacers for insulating performance and paying particular attention to framing materials that allow only a low coefficient of thermal expansion, temperature variations do not allow the connection to be loosened or To create gaps. But a Low-E coating is the essential element to make Windows energy efficient.

How do they do this?

A popular television ad asks, How do they get the caramel in the bar of Caramilk? One could very well ask the same question of blinds: between the windows and the glass doors. How do they have the blinds between the glass?

There are two ways to make these windows and doors. First, many blinds, between glass and glass doors are constructed as a "sandwich" glass. In other words, the blinds are inserted between two windows. A Low-E coating is not applied because the silver oxide is particularly susceptible to scratches. And there is a minimal place in a glass sandwich with a blind for the maximum of an argon gas filling. In comparison, there is simply no way a window with blinds between glasses can reduce your energy bills as much as a sealed two-pane window.

Triple Pane Option

With time, and in order to make windows with blinds between glass more energy efficient, some window companies Transformed them into triple pane windows. This means that they have three pieces of glass with two spaces between them: one space contains the inter-glass blinds, while the other space has a Low-E coating and an argon refill .

While triple panel windows With blinds between the glass can be more energy efficient, just know that the extra piece of glass makes the windows more bulky. The biggest disadvantage of triple pane windows is however the cost. They cost a lot more because you pay essentially two windows: one with a modern technology and energy efficient, and one with blinds between the glasses.

The Blinds Between: Innovation without the Science

One of the arguments advanced asserts that Low-E glass and internal blinds contribute to making the " 39 set of the most energy-efficient glass unit, as the internal blinds absorb the solar heat gain. Let us examine this statement more closely.

There are no blinds or windows of any kind whatsoever – which can dramatically increase thermal efficiency and match those of a sealed glass unit with An argon gas fill and a Low-E coating. In fact, the blinds between the glass actually decrease the amount of argon gas you can put in between these two pieces of glass, eventually compromising the overall energy efficiency of the whole.

But the most remarkable of all is this very simple fact: blinds, curtains, shades and all other window coverings have a marginal impact on energy efficiency in a way : By blocking the transmission of visible light. In other words, sunlight! So even if your blinds are inside the glass this is equivalent to the same reduction in heat and reduction in light you will get by simply pulling out the curtains or drawing a normal blind on a sunny day. You are simply blocking the light without increasing the actual energy efficiency of the window.

The Bottom Line

To summarize, this "increased" energy efficiency derives from the blinds between glass is largely unfounded, and for two main reasons: Can not absorb solar heat gain and Low-E is absolutely essential for any kind of significant energy efficiency. This is the only way to reflect the radiant heat towards the source. Otherwise, heat transfers easily through sandwich blinds in sandwich or no blinds. Inside or outside!

You can save a lot of money and achieve equal or better energy performance through energy efficient double-pane windows with Low-E coatings and argon gas. But if you really like the look, then, by all means, go for it. Just know that your best energy efficiency option will be the triple pane solution.

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Source by Gerry Rogers

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