U_w-Value, g-Value, Frame Width – Three Key Factors for a Good Energy Balance!

A good window does more than keep heat inside. It also lets the sun heat our homes. That is why the energy performance of a window depends not on a single value, but on how several properties work together. The U_w-value describes the heat loss through the entire window. The lower, the better. However, it depends on the window size and glazing. We therefore prefer to work with the U_f-value, as it describes the thermal insulation performance of the frame independently of the glazing and window size. 

The g-value indicates how much solar energy passes through the glass. With g = 0.60, it is 60%; with g = 0.40, only 40%. That means 50% more free solar heat! In winter, these solar gains reduce heating demand. Frame width determines how much glazing area is available. Slim frames allow more solar heat, daylight and views. The window industry has paid too little attention to this aspect in recent years. After all, isn't the original purpose of a window to let light into our homes? A wide frame allows neither daylight nor solar heat to pass through and can therefore worsen the energy balance. In summer, external shading protects against overheating. This way, we use the sun when we need it and block it when it gets too warm. smartwin combines excellent thermal insulation with high solar gains and exceptionally slim frames. Because what really matters is the overall energy balance of the window.

Im Sommer schützt eine außenliegende Verschattung vor zu viel Sonne und Hitze. So nutzen wir die kostenlose Sonnenwärme im Winter und halten sie im Sommer draußen.

smartwin verbindet hervorragende Wärmedämmung mit viel kostenloser Sonnenwärme. Besonders schlanke Rahmen schaffen mehr Platz für Glas und lassen dadurch mehr Sonnenenergie ins Haus. Denn entscheidend ist nicht ein einzelner Wert, sondern wie gut das gesamte Fenster hilft, Heizkosten zu sparen.

 הניוזלטר „רכיבים מוסמכים לבית פסיבי – 1/2018“ מוכיח את ההובלה הטכנולוגית שלנו.

מערכת החלונות המוכחת שלנו, smartwin, היא הראשונה שזוכה בפרס החדש והנחשק.

-Zertifikat Fenstersystem smartwin         -Produktinformationen

smartwin entrance זכתה אף היא, כדלת הכניסה הראשונה, בהסמכה כמערכת דלתות לאקלים קר כבר בניסיון הראשון.

-Zertifikat Türsystem smartwin entrance  -Produktinformationen

בשנת 2022 הצטרפה גם smartwin solar עם הסמכה כמערכת חלונות.

-Zertifikat Fenstersystem smartwin solar  -Produktinformationen

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