During low ambient temperatures, an installation can by-pass an existing chiller giving energy savings of up to 75%, without compromising cooling requirements.
[2] Free cooling is the production of chilled water without the use of a chiller, and can be used generally in the late fall, winter and early spring, in temperate zones.
The cost savings associated with this method are due to the compressor's inactivity, since the blower, fans and pumps are all operational.
The water is partially cooled through the free cooler, then flows through the chillers to achieve the required set point temperature.
In winter, when outdoor temperatures are low enough, the water is chilled solely by the free cooling coil.
[3] United Kingdom: In 2013, Chancellor George Osborne agreed to make a concession for data centers to be exempt from Carbon Reduction Commitment (CRC) and allow them to produce their own Climate Change Agreement (CCA).
Integral chillers are ideal for sites which have limited space and can offer high energy efficiency levels.
These units feature high quality components including scroll and screw compressors, axial fans, and three-way modulating valves.
[citation needed] The other options is an independent free cooler that has a greater capacity for heat exchange, as it is sized to maximise efficiency which enables a larger area for the transfer of thermal energy.