METHOD OF RETROFITTING COMPUTER ROOM AIR CONDITIONER TO INCREASE A MAXIMUM TEMPERATURE DELTA
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United States of America Patent
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Issued Date -
Jul 30, 2015
app pub date -
Apr 13, 2015
filing date -
May 21, 2010
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Abstract
A method of retrofitting a computer room air conditioner having a direct expansion refrigeration circuit to increase a maximum temperature delta of the computer room air conditioner includes adding an upstream cooling circuit that is a pumped refrigerant cooling circuit having a cooling coil disposed upstream of a cooling coil of the direct expansion refrigeration circuit. Air to be cooled is passed in serial fashion across the cooling coil of the upstream cooling circuit and then the cooling coil of the direct expansion refrigeration circuit. The upstream cooling circuit is controlled to cool the air flowing across the cooling coil of the upstream cooling circuit to provide only sensible cooling and so that a temperature of the upstream cooling coil is always above a dewpoint of the air flowing across the upstream cooling coil. The direction direct expansion refrigeration circuit is controlled to provide any latent cooling that is needed.
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