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	<title>Comments on: High humidity in the Data Center. Any advice?</title>
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		<title>By: lamd</title>
		<link>http://itknowledgeexchange.techtarget.com/itanswers/high-humidity-in-the-data-center-any-advice/#comment-94148</link>
		<dc:creator>lamd</dc:creator>
		<pubDate>Tue, 12 Jul 2011 13:15:22 +0000</pubDate>
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		<description><![CDATA[Is there a way to determine when the humidity in my data center is becoming critical? Is there any tell tale signs i will observe?]]></description>
		<content:encoded><![CDATA[<p>Is there a way to determine when the humidity in my data center is becoming critical? Is there any tell tale signs i will observe?</p>
]]></content:encoded>
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		<title>By: dfarlow</title>
		<link>http://itknowledgeexchange.techtarget.com/itanswers/high-humidity-in-the-data-center-any-advice/#comment-58296</link>
		<dc:creator>dfarlow</dc:creator>
		<pubDate>Wed, 03 Dec 2008 14:42:04 +0000</pubDate>
		<guid isPermaLink="false">#comment-58296</guid>
		<description><![CDATA[The one recommendation that I have is what ever you do, make the changes in small steps.  Change a setpoint by one or two degrees and then let things settle down for a day or two.  If you go making too many changes to quickly, you never know what fixed the problem or what made it go the wrong way.]]></description>
		<content:encoded><![CDATA[<p>The one recommendation that I have is what ever you do, make the changes in small steps.  Change a setpoint by one or two degrees and then let things settle down for a day or two.  If you go making too many changes to quickly, you never know what fixed the problem or what made it go the wrong way.</p>
]]></content:encoded>
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		<title>By: ue</title>
		<link>http://itknowledgeexchange.techtarget.com/itanswers/high-humidity-in-the-data-center-any-advice/#comment-57786</link>
		<dc:creator>ue</dc:creator>
		<pubDate>Sat, 15 Nov 2008 07:52:27 +0000</pubDate>
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		<description><![CDATA[In the literature, I generally see recommended relative humidity ranges  listed as 40%  to 55%, with ranges of  20% to 80% usually considered acceptable.  

You should investigate, however, why you are having humidity problems in your data center.  Since servers don&#039;t sweat, most data centers have few people working in them, and cooling coils dehumidify, where is the excess moisture coming from?  The only two places I can think of are unconditioned outside air, and CRAC (computer room air conditioner) units fighting each other.

The more commmon problem is CRAC units fighting each other:  some units are cooling while others are humidifying.  Adjusting the controls or replacing the CRACs with a central system would generally solve the problem.

The other possibility I only saw once:  a building originally designed as a warehouse was converted to a data center, and the owners tried to save money by keeping some of the original AC equipment.  Air handlers dumped filtered but unconditioned air into the space for ventilation.  Since this was a costal city many times the air was humid.  When the humidity level rose they had to shut off the air handlers until the AC system could get the moisture out of the air.   I recommended a variable speed drive on the air handler to slow down the rate of delivery of outside air to something the AC system could handle but still deliver enough cfm for ventilation.]]></description>
		<content:encoded><![CDATA[<p>In the literature, I generally see recommended relative humidity ranges  listed as 40%  to 55%, with ranges of  20% to 80% usually considered acceptable.  </p>
<p>You should investigate, however, why you are having humidity problems in your data center.  Since servers don&#8217;t sweat, most data centers have few people working in them, and cooling coils dehumidify, where is the excess moisture coming from?  The only two places I can think of are unconditioned outside air, and CRAC (computer room air conditioner) units fighting each other.</p>
<p>The more commmon problem is CRAC units fighting each other:  some units are cooling while others are humidifying.  Adjusting the controls or replacing the CRACs with a central system would generally solve the problem.</p>
<p>The other possibility I only saw once:  a building originally designed as a warehouse was converted to a data center, and the owners tried to save money by keeping some of the original AC equipment.  Air handlers dumped filtered but unconditioned air into the space for ventilation.  Since this was a costal city many times the air was humid.  When the humidity level rose they had to shut off the air handlers until the AC system could get the moisture out of the air.   I recommended a variable speed drive on the air handler to slow down the rate of delivery of outside air to something the AC system could handle but still deliver enough cfm for ventilation.</p>
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