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Choosing System Architecture and Cooling Fluid for High Heat Density Cooling Solutions
from Emerson Network Power

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Description:
The traditional raised floor cooling is not designed to cool high heat densities. Certain baseline measures can be taken to optimize the functioning of the traditional cooling system, primarily by optimizing air flow in the room so hot and cold air does not mix. However, adding supplemental cooling currently is the best solution to cool the hot racks and zones that occur in high density environments and generate sensible heat. Supplemental cooling can use water or refrigerant-based cooling technologies and is adaptable to open or closed system architectures. In this document, you'll learn the pros and cons of these cooling fluids and system architectures, as well as how they guide decision making about the most appropriate supplemental cooling technologies for particular data center applications.

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Most equipment manufactured today is designed to draw in air through the front and exhaust it out the rear. This allows equipment racks to be arranged to create hot aisles and cold aisles. This approach positions racks so that rows of racks face each other, with the front of each opposing row of racks drawing cold air from the same aisle (the “cold” aisle). Hot air from two rows is exhausted into a “hot” aisle, raising the temperature of the air returning to the CRAC unit and allowing it to operate more efficiently.

This approach is most effective when cold and hot air do not mix. Therefore, perforated floor tiles should be removed from hot aisles and used only in cold aisles. Blanking panels should be used to fill open spaces in racks to prevent hot air from being drawn back through the rack. Even empty spaces between racks should be filled with blanking panels or racks to prevent hot and cold air from mixing.

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