The Nave Air Conditioning system can cool a room without power. Israeli designer Yael Issacharov was inspired by the "'jarrah"', a traditional Palestinian terra-cotta drinking water container that is hung in a room to cool the water and the living space itself. This clay is full of small pores, from which water filters very slowly, evaporating using the heat in the water. That heat, transferred to the air, makes the water progressively cooler. She wanted to integrate this cooling phenomenon within the building itself. Inspired by architect Hassan Fathy, who brought traditional adobe and mud building methods back to modern Egyptian architecture, Issacharov turned the jara into active walls. Its building block is a terra-cotta tile made of hollow tubes, resembling a piece of woven chain mail or fabric. The intricate design is filled with water which cools as it slowly evaporates, and the room temperature drops as the wall itself cools. The Nave could be a perfect solution for towns in any desert areas, from Texas to Iran, Issacharov says.

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