The special feature of climate glazing is the special coating. This ensures that a lot of daylight enters the rooms, but also that the solar energy is reflected, thus protecting against summer overheating.
Two different technical values apply in the selection of suitable glazing: The Ug value and the g value. These values are explained below in the blue box. A balanced relationship is important for a comfortable climate all year round. A high g value results in free energy gains in winter, but can cause acute danger of overheating in summer.
A low g value is therefore an advantage for large-surface glass facades.
Heat transfer coefficient - The smaller, the better
The Ug value states how much energy is transferred out from a room through the glass, measured in Watt, divided by square meters and times Kelvin. The EnEV 2009 requires Ug values of 1.1 W/m²K*. This value is undershot by Semco Klimastar with Ug values of up to 0.4 W/m²K, thereby setting new yardsticks in climate protection and energy savings.
Energy transmittance - Low g value, high living comfort
The total energy transmittance indicates which percentage of the occurring energy passes through glazing to the interior. It is based on the directly transmitted solar energy and secondary heat radiation following absorption.
The energy falling on the glazing varies dependent on the position of the sun. The higher the g value of a glass, the higher the solar gains are and the resulting building warming on sunny days.
A low g value is therefore particularly important for large glass facades to prevent rapid overheating of the rooms.