The 100-story Empire State Building, inaugurated in 1931 and held the title of the tallest building for 39 years, is considered a significant landmark also because of the advanced technology in its curtain walls. In 2010, the building underwent a comprehensive renovation at a total cost of 550 million dollars, with 120 million dollars invested in energy efficiency. Most of the efficiency included replacing 6,500 windows with windows that transmit light and block solar radiation*.
Today, the Empire State Building is the seventh tallest in New York, and as the growth in height continues, so does curtain wall technology meet more and more complex challenges. As there are more skyscrapers around the world and as much as there is awareness and demand for reducing the carbon footprint – the more the need for innovative construction solutions will increase, especially in the field of curtain walls – which are of enormous importance also from an aesthetic point of view but mainly because they maintain the external integrity of the building, the quality of the spaces the internal ones and the energy efficiency.
Over the years, with the advancement of technology, curtain walls have become independent systems. They wrap the building, protect it from cold and heat, and provide it with energy for self-use.
Smart glasses
One of the prominent technologies in the field of curtain walls is smart glass, which is installed on the aluminum infrastructure. Through an advanced control system, the ‘smart glass’ automatically adapts itself to changing lighting and climate conditions outside the building. Also, the combination of PV cells (photovoltaic cells) in glass curtain walls allows the skyscrapers to generate considerable energy for lighting, heating, and cooling the buildings. As a result, the curtain walls contribute significantly to reducing the carbon footprint.
Even the laminated glasses (glass consisting of two or more layers of fine glass) allow complete blocking of sunlight and blocking of cold or heat without harming the harvesting of solar energy.
Unitized curtain walls
A significant percentage of the factory’s production and assembly is done with the’ unitized curtain wall system’ method. This process includes framing, glazing, and other integral parts, which are then transported to the construction site as modular units. This method contrasts with older construction systems, where each component is transported and assembled separately in the field.
This method has many advantages, such as:
Efficiency and speed: Factory assembly ensures a faster construction process, reducing work on the construction site and simplifying logistics. This efficiency can significantly reduce the overall project timeline.
Quality Control: Manufacturing curtain wall units in a controlled factory environment improves the quality of the final product. This environment reduces the risks associated with changing site conditions.
Minimizing on-site disruptions: There is less on-site construction activity when major assembly work occurs off-site. This reduction minimizes noise, waste, and general disturbances, which is a significant advantage in dense urban environments.
Improved Safety: The factory construction of modular curtain walls offers a safer environment for assembly than on-site construction, thereby reducing the risk of accidents.
Independent of the weather: The unitized method is less affected by adverse weather conditions (rain, strong winds, or heat waves), which can significantly delay traditional construction projects.
Automatic production: the automation in factories enables precise engineering that contributes to creating more complex and aesthetic designs.
High-performance materials: The use of advanced materials such as Low-E glass and thermally efficient glazing improves buildings’ energy efficiency.
Integrated building systems: Modern systems using the Unitized method can combine several solutions, such as solar panels, smart glass, and built-in ventilation systems, which contribute to the building’s overall sustainability.
BIM integration: Using computerized information models (BIM) in designing and manufacturing curtain walls ensures greater accuracy in the construction process and better coordination between different construction teams.
Curtain walls and urban renewal
When urban renewal reaches almost every city, whether in the center or outskirts, the construction industry also focuses on creative solutions for renovating existing buildings. From an economic point of view, a thorough renovation is often more feasible than a demolition and rebuilding project and essential for making existing buildings more sustainable and cost-effective.
Renovation of residential buildings must also include improving curtain wall systems, which, as mentioned, affect both the exterior of the building and the comfort of the user. Global Market Insights Inc. estimates that by 2028, the global curtain wall market will register a growth rate of almost 9.6% in the renovation sector alone.
Impressive aesthetics
In the past, many architects felt intense frustration that photovoltaic windows on the facades (which store energy) must be particularly dark. This damaged the aesthetic appearance of the skyscrapers and required special solutions. Today, thanks to the possibility of turning photovoltaic cells into tiny absorption points, it is possible to maintain the spectacular appearance of transparent or clear glass and still store solar electricity.
The integration of curtain walls in modern architecture is beyond functionality; It is a harmonious combination of aesthetic elegance and sustainable construction methods. The use of curtain walls significantly improves the external appearance of the buildings, offering an elegant, contemporary, and attractive facade both visually and structurally. Moreover, these systems play a decisive role in maintaining the external integrity of the buildings while protecting against environmental factors. New generation curtain walls contribute to a lower carbon footprint, aligning with the growing demand for environmentally friendly construction solutions. By improving thermal efficiency, they reduce energy consumption and operating costs, making them an economically viable choice.
