Completion of server
room air conditioning project for IQ Unity (01/05/15)
Orion air conditioning has completed the
installation of a replacement server room air conditioning system for IQ
Unity, Bedford Technology Park, Bedfordshire, UK. The existing Fujitsu
air conditioning wall mounted air conditioning units were reaching a
critically bad condition with one having a failed compressor, it was
initially installed in 1998 !. Fujitsu air Conditioning is renowned for
its long reliable life and are ideal for server rooms and coms rooms
were a failure can mean the complete shutdown of important parts of a
business. The old Fujitsu air conditioning units were running on R22
refrigerant which is now banned for use in the UK and the EU since
January 2015. The new units are energy efficient inverter air
conditioning systems which have high COP's and modulated inverter DC
compressor which can save up to 40% on server room air conditioning that
will run 24 hours / 7 days a week.
What air conditioning unit was installed in IQ Unity's server room:
2 x Fujitsu
Air conditioning ASYG24LFCC (7.1Kw / 24000Btu) Wall Heat pump Inverter Air
were installed which provided enough cooling for the 50 meter squared
area in the server room. These units have an amazing COP (3.61 initial
electrical input) which means that every 1000w of electrical energy
going in produces 3610 watts of cooling power.
Server room air conditioning efficiency and CO2 emissions:
Fujitsu air conditioning systems took around 60 minutes to fully cool
the server room from 30DegC to 19 DegC and once the server room had
cooled to set temperature the outdoor inverter units slowed down because
the temperature had been reached, therefore just pumping small
amounts of cooling in to maintain the server room temperature. This is
why inverter air conditioning is so efficient at cooling server rooms,
because a serverís heat load is constantly changing due to use the
inverter effectively matches the heat load by speeding up or slowing
down the compressor. Where the old fixed speed air conditioning models
were either on or off according to the thermostat, they often would draw
a huge in-surge current of electricity which costs money and requires a
huge chunk of a buildings electrical fuse rating which maybe only 80Amps
Server room equipment efficiency: 85%
Total estimated power of servers: 6000
Total heat loss: 900 Watts@85%
Room heat load in Square Meters: 4800
Total Heat Load: 5700 Watts
Key points to think about when getting air conditioning for server rooms:
Inverter air conditioning will save
energy. Cheap air conditioning units do not work in cold weather because
they do not have a outside fan speed controller (low ambient kit), once
the ambient falls below 0 DegC outside they fail to cool. Use a
established brand so if a part fails on you server room air conditioning
system you are not waiting 8 weeks for the spare part. It is worth
having two server room air conditioning systems or add twice the
estimated heat load because if one air conditioning unit fails you still
have some cooling back up. If your server room is temporary (ie short
term lease on building) or has building restrictions then portable
air conditioning maybe your only option. Always use auto-restart
units for server room air conditioning units as power failures can shut
budget air conditioning down. We advice never to use over cabinet style
air conditioning, these units tend to leak water which if directly over
the server rack will drip water in to the top.
Establishing the Heat Load Of Your Server Room:
To establish the heat load of you
servers add up all the power supplies of the serverís rack and assume
a 15% loss to heat due to efficiency of the power supplies.
If you have 10 racks within a cabinet
with say a 400-watt power supply requirement for each, the total watts
required will be 4000 watts of electrical supply. Assuming the 15%
efficiency loss on each racks the heat load will be 600 watts.
Establishing the Server Rooms Basic
Work on a average watts per/Msq of
125watts, so if your server room is 5 x 5 meters (25Msq) you will
require a air conditioning unit as close to 3.125 kW.
Advised manufactures for server room
air conditioning: Mitsubishi, Daikin, Fujitsu and Lg.
Sales Installation and Service
UK: +44 (0)1234 841221
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Last updated - 14/03/2019