solgevinsterkoeffisient

The solgevinsterkoeffisient, also known as the "solar gain coefficient" or "solar heat gain coefficient" in English, is a metric used primarily in architectural and building physics to quantify how effectively solar radiation contributes to heating a building. It is particularly relevant in passive solar design, where the goal is to optimize natural heating while minimizing unwanted heat gains.

The coefficient is expressed as a dimensionless ratio, typically ranging between 0 and 1, representing the proportion of incident solar radiation that is transmitted through a window or glazing system and subsequently absorbed by interior surfaces. It accounts for both the transmittance of the glazing material and the absorptance of interior elements, such as walls, floors, and furniture. Unlike the solar heat gain coefficient (SHGC) commonly used in the United States, the solgevinsterkoeffisient specifically emphasizes the *useful* solar gain within a space, excluding direct heat losses through the glazing itself.

In practice, the value depends on factors such as window orientation, shading devices, and interior thermal mass. For example, a south-facing window in a temperate climate may achieve a higher solgevinsterkoeffisient due to optimal solar exposure, while a north-facing window in the same region would yield a lower value. Architects and engineers use this metric to balance solar gains with thermal comfort, ensuring that buildings remain energy-efficient without overheating.

The solgevinsterkoeffisient is particularly important in regions with significant seasonal variations, where passive solar strategies can reduce reliance on artificial heating and cooling systems. It is often calculated using simulation software or empirical data from building performance studies. While related to other solar performance metrics like U-values and SHGC, it provides a more localized assessment of a building’s ability to harness solar energy effectively.