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Views: 77 Author: Site Editor Publish Time: 2022-06-27 Origin: Site
Some data centers have concrete floors with cooling systems raised above the data center, using top-down cooling. Some small number of studies have shown that in high density environments (over 250 watts per square foot), flat flooring can provide more cooling to cabinets than raised flooring.
Flat floor designs can be used in all types of data storage facilities and server rooms. Situations where a hard floor is more appropriate by far include
Very large data centers: with high density and high power. In high-density data centers: new fresh air systems and hot aisle control strategies can be used. In compact spaces: the floor cannot be raised and it is difficult to achieve the required power density.
c) Structural Summary
Most studies show that there is no real demonstrable low cost or energy savings between the two designs; however, in practice, we find that one design is much better than the other. This may be due to the fact that different facility managers experience different optimized designs in different environments. In fact, there are no studies that conclusively show that any one design is absolutely better than another.
Despite the raised floor versus flat floor debate, there is no doubt that the most efficient way to transfer cooling to server cabinets is through some form of hot or cold aisle containment. Enclosed cooling systems in server rooms build predetermined pathways for CRAC or CRAH units to precisely cool at the server without introducing heat from the external environment.
Closed hot and cold aisles significantly reduce PUE because there is no ineffective space that is neither cooled nor heated, so the data center does not need to control additional ambient temperature, only precise control of rack temperature. Essentially, we have less air to cool, and the cooling effort is significantly reduced, providing a lower PUE. such a system, when optimized, enables the facility to deliver higher power density.
Air-side chillers bring outdoor air into the building and distribute it to the data center floors. The air exiting the servers is not circulated and cooled, but sent directly outside. This is also known as "outside air cooling" or "ambient air cooling". This method usually works in conjunction with a common chiller, which brings air into the building from outside the building. Newer data centers built in areas where the average temperature stays between 18 and 27 degrees tend to use ambient air to meet most of their cooling needs. The main purpose of utilizing this cooling method is to save money. If the outside air is particularly cold, the chiller can mix the outside air with the exhaust air so that the temperature and humidity of the exhaust air will fall within the desired range for the equipment.
