brisoleil

A brise-soleil, French for "sun breaker," is an architectural feature designed to reduce heat gain within a building. It typically consists of a series of blades or fins, often made of metal, wood, or concrete, which are attached to the exterior of a building. These elements are angled to block direct sunlight during the hottest parts of the day, while still allowing natural light to penetrate the interior.

The primary function of a brise-soleil is to improve the thermal performance of a building. By deflecting solar radiation before it reaches the windows, it significantly reduces the cooling load required by air conditioning systems, leading to energy savings and a more comfortable indoor environment. The effectiveness of a brise-soleil depends on its orientation, the angle of the blades, and the latitude of the building's location.

Beyond its functional benefits, the brise-soleil can also contribute to the aesthetic appeal of a building. Its repetitive geometric patterns and textural qualities can create a dynamic and visually interesting facade. Historically, the concept has been used in various forms across different cultures, but it gained prominence in modern architecture during the mid-20th century. Architects often integrate brise-soleils as a prominent design element, influencing the overall composition and character of a structure.