Densification: Power & Cooling

Another option that continues to grow year-over-year is not going up or out at all, but solving the need for more compute by increasing IT density. The computing power density has risen from 5 kW per rack a decade ago to an average closer to 15 kW per rack for today’s new data centers. The…

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Adding Cooling

There are a number of ways to effectively and efficiently cool a data center.  Below are some considerations when looking to add cooling to your critical space. Strategy: Understand the cooling methodology for your data center: air and/or water; raised floor; hot/cold aisle; containment; perimeter cooling; localized cooling; liquid cooling; etc.  Establishing a new cooling…

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CRAC vs. CRAH

I had this come up recently… what is a CRAC (pronounced ‘crack’)?  What is different from it than a CRAH (pronounced ‘craw’ or ‘cray’)? CRAC = Computer Room Air Conditioner A CRAC is often thought of as having an internal compressor, thus not needing the support of a centralized chilled water system.  But this also…

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What do we want from CFD?

Computational Fluid Dynamics (CFD) analysis of data centers has been going on for some time, but how does it help us?  For an existing data center, do you want a CFD model to show you things you already know, such as hot or cold spots? 90% of the time we are using a CFD report…

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Cooling Tower Water Storage

When operating your data center, often there are backup measures to keep things running during a power outage.  Generators may be the first thing that comes to mind, as they bring power back during an outage, but along with that the cooling systems also need operate.  As the heat is rejected through the mechanical systems,…

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Warmer Chilled Water on Existing Systems

So we are looking to save energy, and one of those ways is increasing the chilled water temperature.  But how does that save anything?  Increasing the chilled water temperature brings it closer to the condenser water temperature and thereby reduces the amount of work (lift) a chiller has to perform.  Since the chiller usually has…

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Glycol & your system

Using glycol for your chilled water system will have dramatic effects and understanding how painful it can be to your efficiency is a must. Why are we using glycol? In most applications the use of glycol is to lower the fluid (most often water) freezing point. The more glycol that is used, the lower the…

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Ice Storage Systems?

The ASHRAE technical committee Datacom book series makes mention of ice storage for consideration.  While ice storage is useful if you have the up-and-downs that a normal office building has, it has much less application for a data center where load runs much more evenly throughout 24 hours.  The amount of ice stored would amount…

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Rack & Cabinet Airflow Considerations

What should you be looking for in a rack or cabinet in your data center?  Focusing on the important features will save you time and money in the years to come, so take the time to know what you have and where you might be headed. Although most data centers are supported by standard racks…

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Longevity of Geothermal

On rare occasion I run across a system that, although smaller in size, supports a mission critical facility and supporting spaces with geothermal.  In one instance, open loop geothermal-sourced cooling was serving a smaller network operations center that had a large screen wall with a small data center behind it.  The building had two central…

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