The double glazed sealed units, DVH, or thermo, are one of the most common types glazing used today in construction. Patented in 1865, DVH units were implemented in applications architecture after World War II. Due to the excellent thermal and acoustic properties, these units have completely replaced the monolithic glass windows basic.
Over the decades the DVH thermal performance has been improved with the introduction of glass with a layer of low emissivity (Low-E) and low conductivity gases. Then the attention was on the edge and reducing heat loss caused by highly conductive materials. DVH Today the most common is composed of two glass plates and an aluminum spacer around the edge of the glass. The aluminum containing a desiccant moisture remover d ela. The major benefits of aluminum spacer are: low weight, durability and relative low cost. The disadvantage of the aluminum spacer is the conductive property of aluminum, which sometimes causes the edge of the unit DVH lose more heat than the center of the glass.
To overcome this limitation, the glass industry developing so-called low-conductivity spacers or warm edge spacers (Warm Edge). These are designed to improve the thermal performance of the window, reduce condensation and allow the appropriate machinery manufacturing faster and easier for the DVH. There have been several attempts to position these products in the market. However, the change was highly anticipated, big and a higher cost to the system of aluminum with a small improvement in U value of DVH.
When they took out the new legislation on energy saving in Europe in 1977, became the interest of low-conductivity spacers. Currently, there are several low-conductivity spacers on the market, however due to the facts mentioned above the classic aluminum spacer still remain the number 1 choice for DVH.
Source: http://www.glassonweb.com/articles/article/213/
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