Tiny channels of water could cool windows and cut down on air conditioning bills


Like blood circulating through the human body, a new system out of Harvard harnesses channels of running water to cool windows that receive a lot of sun. The water carries away heat, leading to less work for air conditioners and a lower electricity bill.

The channels are ultra-thin and encased in a sheet of clear silicone rubber that is stretched over a window. They crisscross to create a mesh-like pattern. While the channels are visible when empty, they become transparent when they contain water.

Cooling windows with water

The project grew out of the Wyss Institute at Harvard, where researchers were using water channels to cool small medical and research devices. A team led by Wyss Institute founding director Don Ingber figured out a way to scale up the channels, making the material ideal for windows.

In the lab, the team tested the system by heating a small window panel to 100 degrees. The circulating…

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