In both instances, the skin air have to be much less energetic than the return air for the system to enter the economizer mode. Free cooling techniques can have very excessive efficiencies, and are sometimes mixed with seasonal thermal energy storage in order that the chilly of winter can be used for summer time air-con. Common storage mediums are deep aquifers or a natural underground rock mass accessed via a cluster of small-diameter, heat-exchanger-equipped boreholes. Some techniques with small storages are hybrids, using free cooling early within the cooling season, and later using a heat pump to relax the circulation coming from the storage.
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