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White Paper: Is data center free cooling feasible in the middle east?

Posted By Administration, Thursday, 18 June 2015

Check out the link provided by one of our members, Asean Engineer Noriel Ong, a member of PSME UAE Chapter.

This case study will evaluate the feasibility of data center free cooling in the Middle East using indirect evaporative cooling (IEC).

General Assumptions:
• 1MW Data Center IT LOAD
• Cooling demand at 100% IT LOAD
• The data center is pressurized, with no infiltration of outside air into the white space
• The analysis focuses on the white space only
• Energy consumption of cooling requirements of other spaces are not part of this case study
• Data center cabinets are in hot and cold aisle configuration with containment

Evaporative Cooling

Evaporative cooling uses water as a medium to cool the air through its evaporation. The adiabatic evaporation of water provides the cooling effect which requires less energy than the typical vapor compression system used for air conditioning. There are two types of Evaporative Cooling - Direct and Indirect. According to ASHRAE HVAC Systems and Equipment Handbook, “With direct evaporative cooling, water evaporates directly into the airstream, reducing the air’s dry-bulb temperature and raising its humidity. Direct evaporative equipment cools air by direct contact with the water, either by an extended wetted-surface material (e.g., packaged air coolers) or with a series of sprays (e.g., an air washer).”

On the other hand, according to ASHRAE: “With indirect evaporative cooling, secondary air removes heat from primary air using a heat exchanger. The water does not make any contact with the primary air, in this case, the data center air. In one indirect method, water is evaporatively cooled by a cooling tower and circulated through a heat exchanger. Supply air to the space passes over the other side of the heat exchanger. In another common method, one side of an air-to-air heat exchanger is wetted and removes heat from the conditioned supply airstream on the dry side.” See Figure 1.

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Hi Noriel!
In the first place, thankful for your post. I do agree with that and nice point to our fellow engineer for that issue. A learning process through by your white paper is an added factor.
Thanks for your sharing.
Cheers!
Ronald
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