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Waste heat reclamation in datacenters has long been viewed as hard because the heat released is low grade. What this means is that rather than having a great concentration of heat, it is instead spread out and, in fact, only warm. The more concentrated the heat, the easier it is to use.  In fact, that is exactly how many power plants work. When the temperature of the cooling medium is several orders of magnitude cooler than burning fuels such LNG, Petroleum, or Coal, extracting useful energy becomes challenging.   However, data center heat reclamation si clearly a problem well worth solving since just about 100% of the power that enters each facility is released as heat into the environment.

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