The great cooling debate - You don't need more cooling, you need less heat!

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Gary Dunlap's Take On Things

My journey through a new part of a familiar industry.

The great cooling debate - You don't need more cooling, you need less heat!

  • Comments 1

My trip to the Alcatel-Lucent facility in Plano was great. Alcatel showed us great hospitality (not to mention feeding us pretty good too) and the performance of their new modular cooling solution was just as advertised.

 

The most powerful comment I can make about it is this one, it was hot in Plano that day and after the walk over to the data center, I was warm. When we got inside and were standing in the "hot aisle" I found myself leaning into the back of the racks to cool off. I never in my entire life thought I would ever say that! The principal is simple if you don't blow all that hot air out into the room , it makes the problem much easier to deal with. There are a couple of caveats here that I should mention, The first is about the energy savings. Using chilled water especially existing chilled water can net significant energy savings.Especially if you convert from traditional cw cooling to the Modular System. Air cooled direct expansion cooling will eat into the potential savings pretty dramatically due to the electricity cost to run the compressors. The second caveat is size of installation. This system doesn't really lend itself to smaller deployments. All in all , I was very impressed with what I saw and it gives a lot of credence to the theory that CRAC cooling is really about heat rejection and not air or cooling capacity.

I have looked at lots of different ideas for server room cooling, I find Alcatel's to be the most practical and usable of them all. I mentioned to them that in some deployments, putting in a small package chiller might be a very good idea since the ROI for chilled water was so dramatic. I keep going back to something we say here a lot, sometimes you don't need more cooling you just need less heat. 

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