New Zealand designer Henry Glogau developed an innovative sustainability project called the Solar Desalination Skylight, a multifunctional system designed to provide clean drinking water, natural lighting, and renewable energy using only seawater and sunlight.

 

New Zealand designer Henry Glogau developed an innovative sustainability project called the Solar Desalination Skylight, a multifunctional system designed to provide clean drinking water, natural lighting, and renewable energy using only seawater and sunlight. The concept gained international recognition as a finalist in the 2021 Lexus Design Award and was also honored in several major design competitions for its potential to address resource scarcity in vulnerable communities. Inspired by the challenges faced by residents of informal coastal settlements in northern Chile, Glogau designed the skylight as a practical and affordable solution that could be integrated directly into homes. Rather than relying on expensive infrastructure, the device uses natural environmental processes to generate essential resources in regions where access to safe water and electricity is limited.

The Solar Desalination Skylight operates through a simple yet highly effective desalination process. During the day, seawater is pumped into a bowl-shaped structure mounted on a roof. Solar heat causes the water to evaporate, leaving behind salt and impurities. The evaporated water then condenses on specially designed surfaces and is collected as clean drinking water, which can be accessed through a tap at the base of the device. In addition to producing fresh water, the skylight creates a soft, diffused natural light inside the home, reducing dependence on conventional lighting systems during daylight hours. The design transforms an ordinary architectural element into a source of multiple essential resources.

One of the most remarkable features of the project is its ability to generate energy from the leftover salt brine. Instead of treating the remaining concentrated saltwater as waste, the system uses it to create seawater batteries through a chemical reaction involving metal electrodes. These batteries help power LED lighting during the night, extending the usefulness of the skylight beyond daytime operation. By combining water purification, illumination, and energy production into a single device, the project demonstrates a circular and sustainable approach to resource management.

The design was tested in collaboration with local communities in Chile and showed promising results in producing safe drinking water while improving living conditions. Its low-tech construction, reliance on abundant natural resources, and adaptability to different environments make it a compelling example of how thoughtful design can address global challenges. As climate change and water shortages continue to affect millions of people worldwide, innovations like the Solar Desalination Skylight highlight the potential of sustainable technologies to improve quality of life while reducing environmental impact.

Planet Warriors