| 摘要 |
A tower for cooling a liquid includes an impermeable outer wall, and a flexible but non-stretchable, porous, air-permeable inner wall spaced inwardly from the outer wall to define a chamber between the two walls. The air-permeable inner wall has a multiplicity of pores through which air can pass in order to remove deposits from the internal face of the inner wall. A delivery means is provided for injecting air into the chamber between the two walls, and further delivery means injects air into the internal volume within the inner wall, this being the cooling air. A further means sprays the liquid into the internal volume surrounded by the inner wall. To provide pressurized air to the annular chamber, openings are provided in the outer wall, and a plenum external to the outer wall communicates with the openings, so that by continuously injecting air into the plenum, it will automatically and continuously pass to the annular chamber, and thence through the pores of the inner wall, in order to clean the inner wall of deposits.
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