There are interesting cooling functions that can be achieved with this technology but also lots of others..

Applied Science Trompe

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trompe is a water-powered gas compressor, commonly used before the advent of the electric-powered compressor. A trompe is somewhat like an airlift pump working in reverse.

Trompes were used to provide compressed air for bloomery furnaces in Catalonia and the USA. The presence of a trompe is a signature attribute of a Catalan forge, a type of bloomery furnace.

In Paris they were used for a time to compress air to drive the city's first electricity generation scheme, and in the Alps they were used in France and Switzerland to provide compressed air for early alpine tunnels.

Trompes can be enormous. At Canadian Hydro Developers' Ragged Chute facility in New Liskeard, Ontario, water falls down a shaft 351 feet (107 m) deep and 9 ft (2.7 m) across to generate compressed air for mining equipment and ventilation.

Continue reading in wikipedia

Bill Mollison class

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Bill Mollison explains what a trompe is and how compressed air can provide limitless amounts of clean energy using technology we have had for hundreds of years.

Bruce Leavitt Presentation 

On Trompe Technology

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The October 21, 2013 Environmental Issues Forum hosted by the Joint Legislative Air and Water Pollution Control and Conservation Committee featured a presentation on 17th Century trompe technology which promises to make today's passive mine drainage treatment systems smaller, more effective and less costly.

Here Bruce Leavitt, trompe designer and developer, provided a technical presentation on how a trompe air compressor uses mine water to compress air without any outside power and without any moving parts; how the compressed air can be used to oxygenate the mine water to accelerate iron oxidation; and how to identify mine waters that can benefit from aeration. Link For More :