‘People Are So Proud of This’: How River and Lake Water Is Cooling Buildings

The article highlights the innovative use of river and lake water to cool buildings, focusing on Paris’s extensive district cooling network that draws on the River Seine. This system is crucial for maintaining optimal temperature and humidity levels in landmarks like the Louvre, which requires significant cooling capacity to preserve priceless artworks. Water-based cooling is highly efficient due to water’s density and avoids exacerbating the urban heat island effect, unlike traditional air conditioning. Paris’s network currently serves around 800 buildings over 100 kilometers of pipes, with plans to expand to 3,000 buildings and 245 kilometers by 2042. Similar systems are emerging in cities like Toronto and Rotterdam, where river water is used to cool various public and private buildings. However, the article also discusses challenges posed by climate change. Rising temperatures increase cooling demand while simultaneously warming water sources, reducing their effectiveness for cooling. This paradox threatens the long-term viability of water-based district cooling systems. Despite these concerns, demand for such sustainable cooling solutions is growing, driven by