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A comment on This tech eliminates the need for water for air-conditioning of buildings. Parent comment

Re:This tech eliminates the need for water for air-condition... by JshWright on Friday May 27, 2016 @08:02PM (#11789943)
The amount of surface area you would need to have underground to expose the air to would be tremendous. The reason heat exchangers work is because they substantially concentrate the heat (or the 'cold'), reducing the surface area needed.
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