Window classification parameters for energy efficiency

Window classification parameters for energy efficiency

Air Leakage Rate

Visible Transmittance

Solar Heat Gain Coefficient

Total heat transfer coefficient (U-Factor)

Air Leakage Rate:

The heat dissipation and the heat of the sun enters the building, causing the air to move from the openings and seams in the different parts of the window. For this purpose, the air leakage rate (AL) parameter is used to compare the efficiency of the windows. AL represents less the movement of air through the window seams.

Visible Ttansmittance:

Double Window Percentage(پنجره دوجداره)

The light transmission coefficient depends on the optical properties of the glass layer used in the window, and the light transmittance greater in the window indicates the passing of visible light throughout the day. More light windows are better for better viewing and maximum use of lighting throughout the day.

Solar Heat Gain Coefficient:

The solar thermal input coefficient (SHGC) represents a portion of the solar thermal energy that passes through the window and enters the room or is absorbed in the glass and then transported to the room. Lower SHGC indicates less heat entering the sun inside the building.

Total heat transfer coefficient (U-Factor):

The heat loss from the window is expressed by the total heat transfer coefficient of the window. The insulation value of the window against heat transfer is expressed by the thermal insulation coefficient (R-Value), which is the thermal insulation coefficient of the heat transfer coefficient image. The larger thermal insulation coefficient in the windows indicates a lower heat exchange between the room and the outside through the