Heating/Piping/Air Conditioning, July 2014, by Scott Arnold.
http://hpac.com/air-conditioning/report-highlights-opportunities-cooling-world-s-data-centers

Article summarizes and highlights results of a Lux Research report on the forecasted growth of data centers and the resulting demand for cooling equipment and capacity. The full Lux report is not available for free, but this summary is informative.