USE OF FREE COOLING IN COOLING GROUPS WITH AIR COOLED CONDENSERS

USE OF FREE COOLING IN COOLING GROUPS WITH AIR COOLED CONDENSERS

As opposed to conventional cooling groups with air cooled condensers, use of groups with integrated free cooling coils has gained popularity of late. Free Cooling is obtaining cooling water without operating or partially operating the chiller compressor of the group by taking advantage of the low ambient temperature. For example in Great Britain, the use of integrated free cooling coil water cooling groups have a significant role in the fact that 62% of the annual cooling demand is met through free cooling. In the country, only 38% of the annual cooling requirement is obtained from mechanical cooling .

Groups with integrated free cooling coils are alternative systems for cooling applications used in large computer and server rooms, Internet and telecommunication data centers. They have the capacity for both mechanical and free cooling (partial and complete) [7]. Figure 4.A shows a view of the cased unit of the water cooling group with integrated free cooling coil, and Figure 4 B shows a simplified representation of the structure of this type of unit. The free cooling coil is placed in the front section – according to the air intake direction of the unit- of the air cooled condenser coil. As the ambient temperature drops below that of the return water, the control valve sends the return water to the free cooling coil for pre-cooling or for complete free cooling.

Figure 4.A Air cooled water cooling group with Integrated Free Cooling coil	Figure 4.B Schematic for air cooled water cooling group with Integrated Free Cooling coil

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