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German Technology
 
Glasses
 
Glass plays a very important role as a room divider, both indoors and outdoors. Its transparency allows it to be permeable to light, while allowing visual lightness. Technological advancements position it as a suitable material for almost any ubication. In combination with wood, it provides comfort, security and privacy.

The most commonly used types of glasses are: Clear Glass, Laminated Glass, Tempered Glass, Insulated Glass and Low-E Glasses.

 
Recommendations for choosing glazing

• Is a planibel clear glass adequate?
• Is protection against direct solar and UV Energy with a coated glass requested, to prevent health and material damages, caused by UV light transmission?


To make the correct decision, it is important to verify the positioning of each individual element. Shaded elements do not require UV protection. Solar Radiation (UV) are direct and reflected rays of energy.

• Is a Thermal Isolation needed to isolate the inside temperature from the outside temperature?*
• Is Acoustic Isolation needed?*
• Is Safety Glass requested?*
 

* When using thermal or acoustic isolating glass, the correct sealing system between wall and frame must be used. Non-professional installation significantly decreases the thermal- or acoustic isolation due to gaps in the isolation. The same applies for all framing and sealing of mobile elements. Each element functions individually as isolating element as good as its weakest link.

 
What to know about glasses, isolation and its effects

Light Transmission (Tv) Factor


The light transmission (Tv) factor is the percentage (%) of light, i.e. visible rays, passing through the glass; the rest is reflected or absorbed. Because of the high light intensity in the tropics, it is recommended to dose the amount of direct light that enters into the house. The higher the Tv value, the more light passes through the glass.


Solar Factor (g-Value)

The g-value is the percentage (%) of total solar energy transmission that enters through the glass. There are three types of radiation in the solar spectrum: rays that can be seen by the naked eye (50%), ultraviolet rays (5%) and infrared rays (45%).

Ultraviolet and infrared rays are invisible, but all three types of ray emit energy and, therefore, act as heat sources.


 
The higher the g-value, the more heat is released into the inner room. The lower the g-value is, the better energy efficiency is reached.  
UV Transmission (Ultraviolet Light)

Ultraviolet (UV) light is electromagnetic radiation with a wavelength shorter than that of visible light, in the range of 10 nm to 400 nm. Although UV light is invisible to the human eye, most people are aware of the effects of UV through the painful condition of sunburn, but the UV spectrum has many other effects, damaging to human health as skin cancer, premature aging, irritation, wrinkles, blemishes or loss of elasticity.

The lower the UV-value is, the more efficient protection is reached.

Light / Radiation Reflection

Reflection is defined as the bouncing back of rays of light on the surface. It occurs on almost all surfaces. Some reflect a major fraction of the impacting light, for example water; others reflect only a small part of it, while absorbing the rest (Black colored materials).

When the sun shines, light and solar radiation is reflected, especially from surfaces that cause a mirror effect, such as water. The angle at which the sun ray impacts on the surface equals the angle at which it is reflected. Therefore, the lower the sun angle the greater the percentage of additional solar radiation and light is reflected.
Surfaces like, sand, tiles and water reflect much of the UV radiation that reaches them. Because of this reflection, UV intensity can be deceptively high even in shaded areas.
 
Thermal Insulation (Ug-Value)
The Ug-value indicates the heat flow rate through a given glass(cooling loss through the glass) due to the difference between indoor and outdoor temperatures, EXCLUDING THE SOLAR RADIATION HEAT (Value g).

The lower the Ug-value, the less heat transmits through the glazing material and the more cooling efficiency is reached.

For instance, the Ug-value of single glazing is 5.8, compared to 2.8 for insulated glazing and just 1.1 for Low-e glass.
 
 

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