ENERGY
COMPARISON BETWEEN SYSTEMS
CRAC’s
Can provide very close control of
temperature and humidity.
Typically uses energy intensive
centrifugal fans
In many cases hot spots are
present due to poor air
distribution.
CRAC’s are normally large duty
items resulting in expensive N+1
and 2N solutions.
Energy use varies from 33% to
100% of equipment installed
capacity.
Cannot normally be
accommodated by UPS.
Expensive equipment is required
for rapid recovery from power
outage.
EcoCooling
Can provide ASHRAE and
manufacturer compliant
conditions.
Uses low energy axial fan
technology
Hot and cold aisle arrangements
are ideal for EcoCooling systems.
now obsolete. There is much debate within rows with all of the air intakes and hot Small modules offer low capital
the industry about the value of humidity aisles with all of the air discharges. cost solutions to differing tiered
control. Implementing good static EcoCooling have recognised the need reliability requirements.
management practices, particularly with for more energy efficient cooling in this Energy use is typically 10% of
technicians working on equipment, can sector and have been working with data installed capacity dependent
remove many of the potential problems. centres and server room equipment upon ambient conditions.
The EcoCooling system can help avoid manufacturers to develop this new UPS is normally capable of
static problems as humidity is higher. modular system which can be retrofitted to maintaining supply to
All server cooling systems are more existing facilities. Comprehensive process EcoCoolers. In case of power
efficient if air flow to and from the servers controls maintain compliant temperatures outage cooling recovery is
is uncompromised by mixing. The together with all of the connectivity practically instantaneous.
arrangement of servers in ‘hot and cold’ required for the secure and safe operation
aisles goes a long way to achieving this. of the total package.
This system provides an ideal solution for For further information or a free 01284 810586 or visit our web site at
the EcoCooling system where the servers quotation please email us on www.ecocooling.org where you will find
are arranged in alternating hot and cold sales@ecocooling.org or call us on further information and case studies.
Warwickshire County Council Case study
Two EcoCooling evaporative cooling hours a day to cover a 30Kw load. has not been used at all. The reduction in
units have been used at Kings House The solution involved the installation costs is enormous as are the carbon
Bedworth for Warwickshire County Council of two evaporative cooling units which are savings. See table 1.
to cool their server room and reduce used to cool the air most of the time with
energy costs and the associated carbon the CRACS only being used as an
footprint automatic back up when the evaporative
The room was being cooled by three coolers cannot maintain temperature
existing CRACS and costs were becoming So far the units have been up and
too high as the unit had to be on 24 running for over 12 months and back up
CRAC EcoCooler Saving
Annual kWhr 150,000 14,000 136,000
Cost £18,000 £1,680 £16,320
Carbon Kg 80,500 7,500 73,000
Table 1
SUSTAINABLE FM | NOVEMBER/DECEMBER 2009
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