Comtec v2 19/12/08 12:55 Page 29
Facilities
close-coupled cooling design principle ARCCA to remain in full control over The ‘free cooling’ aspect of the overall
which locates cooling equipment the conditions within its computing solution was of particular interest to
close to the heat source ensuring that environment, and to adapt to change ARCCA, as it validated their original
heat removal can be more efficient and capacity requirements rapidly. desire to seek a highly-efficient water
and predictable. based cooling system.
Intelligent approach under
ARCCA worked with APC Gold pressure Where the need for cooling continues
Partner Comtec to create a design Working within the constraints of during colder ambient temperatures
that would coordinate power, cooling, available space, limited access, self- and when the ambient temperature
rack, protection, management and imposed electrical power limits and is lower than the return liquid
services within a dense footprint, noise restrictions, Comtec and temperature, there is a large potential
using APC’s standardised and ARCCA worked in close partnership to reduce the energy consumption of
modular approach to datacentre to overcome a series of planned and the liquid chiller by utilising the benefit
design and installation. The unforeseen challenges in order to of these lower ambient temperatures
advantages of APC technology bring the project in on time and on for substantial proportions of the year.
include the quick deployment of budget. For example:
additional cooling which can be xrhombus Confronted with the need to situate Comtec recommended purose-
achieved allowing the datacentre’s the external ‘free cooling’ chillers with designed free-cooling chillers capable
physical layer to adapt to change and a confined space so as to not disturb of providing low energy consumption.
expansion. Greater efficiency can sensitive laboratory experiments and During periods where free-cooling
therefore be achieved through teaching lectures nearby, Comtec cannot completely satisfy the cooling
rightsizing cooling to the IT load. advised and evaluated the most load, the solution chosen will also
Specifically, Comtec enabled ARCCA appropriate location and alignment operate on partial free-cooling which
to capitalise upon: is topped up with an element of
xrhombus Required to address stringent mechanical cooling to meet the
Precise scalability and total energy efficiency parameters in cooling demand. This feature means
resilience parallel with maximum scalability and that the solution only needs to
By utilising the UK’s first deployment resilience, Comtec collaborated with operate completely on mechanical
of APC Symmetra ® PX 160 UPS’s, APC to deliver the UK’s first ever cooling for about 38% of the year and
ARCCA enjoy high availability deployment of APC Symmetra ® PX typically saves 35% of the energy
safeguards that are continually ‘right- 160 UPS’s, amongst other similarly consumed by a conventional air
sized’ to their evolving uninterrupted advanced technologies cooled liquid chiller.
power requirements.
Intelligent, contained design
APC Hot Aisle Containment System
incorporating In-Row™ RCs served by
chilled water are capable of
supporting high density environments
of c. 20kW per cabinet.
Highly efficient cooling
Carbon Trust Energy Technology List
compliant chillers situated outside the
datacentre are configured to provide
chilled water for ‘free’ during periods
when the outside ambient
temperature is sufficient cool/cold.
Total control and manageability
The nature of the APC InfraStruXure®
datacentre components used and the
deployment of sensitive probes allows
Winter 2008 www.datacentresols.com | DATA CENTRE SOLUTIONS | 29
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