design & facilities management
the savings resulting from running
the chillers in economiser mode
have to be greater than the energy
expended in running the dry coolers,
server fans and CRAHs.
Study
Data centre operators need a better understanding
of how IT equipment operates and how its
reliability is impacted at high temperatures.
Although allowing chillers to
operate in economiser mode for a
greater part of the year produces
immediate energy savings these
are offset by the greater burden
placed on other parts of the cooling
infrastructure. Dry coolers must
operate when the chillers are in
economiser mode. Furthermore,
there is an increase in the energy
expended by fans both in the
server racks themselves and in
the computer room air handlers
(CRAH) as the airflow cubic feet/m
(CFM) requirements increase as
temperature rises.
For raised temperatures to
be successful in reducing overall
energy requirements, therefo &R