High COP Inverter air conditioning will save money in a short space of time:
Because server rooms require cooling 24 hours / 7 days a week service it is advised when purchasing server room air conditioning units to use a well-known brand and energy efficient inverter air conditioning systems. Inverter air conditioning units will save energy and help prevent equipment failure while offering a long service life. All server rooms and COMM'S equipment even modern blades give off heat and need to be constantly cooled otherwise the equipment overheats and shut down causing major problems for your business. Some Mitsubishi Electric inverter air conditioning units boast a 0.15 GBP a day running cost (Mitsubishi Electric MSZ-FD25VA Wall Mounted (2.5kW / 9000Btu) High COP Inverter Air Conditioning) so the payback time over a year would be within 6 months compared to fixed speed equipment, advised for a small server rooms no bigger than 15M/sq. All information a server room manager will already know. Below are a few bits of advice we have learnt through years of fixing and installing air conditioning in server rooms.
In Case Of
If your server room
offers critical service it may be worthwhile having some portable
air conditioning units available for emergency breakdowns or if you
are awaiting a part. Some manufactures have parts available from stock
other may have a lead time of 6 weeks.
Cheap Air Conditioning Units Have Issues:
The cheaper air
conditioning units have issues with parts so if your unit breaks down
the part required may take weeks to source or may require a complete
replacement. Cheaper air conditioning equipment rarely come with an
outdoor cold weather / low ambient kit because they are purely
designed for residential / comfort cooling applications not year round
cooling (so if the temperature gets to cold outside then the
indoor unit will not cool properly because the inside temperature is
hotter than the outside), a common fault in northern Europe
winters. They also have a fatal floor, many do not have "auto power
restart" so if there is a power cut they will not restart !!
It is always advised
to have spare capacity of cooling in the server room. That means
either two of the same capacity air conditioning units units
fitted with the aim of either sharing the capacity or equalling it when
one unit fails or a portable air conditioning unit. The later always
works out better for future server room expansion as a new air
conditioning unit will now be required to meet the new heat load.
How Much Cooling
Capacity Is Required?
The server equipment
is only as good as your power supplies or system efficiency. If you have
a small server room of around 10 Sq/M and operate modern server room
equipment which is electrically rated at 10kw including power supplies
with a coefficient of performance of 85% (Google's server
power supplies are more than 90% efficient.
HP's server power supplies have reached
94% efficiency) then you can expect to lose 15% to heat
or 1500 watts. Take into account the size of the room and add 130 watts
/ square meter or 1300 watts. The server room will require 2800 watts of
cooling. It is good practice to go slightly larger in case the server
room is expanded with equipment at a later date.
Server Room Air
Conditioning Case Study and Running Costs:
A client's server
room using a fixed speed air conditioning unit for
cooling was in need of re-newel. We advised using a Mitsubishi
Heavy Industrial - SRK71ZE-S1 Wall Mounted (7.1kW 24000 Btu) hyper
inverter wall air conditioning unit which is a hyper efficient air
conditioning unit with a category "A" energy product label and
designed for continual use which many server rooms require. The old
fixed speed (non inverter) air conditioning units used a lot of energy
because of the start-up current associated with inductive loads of a
fixed speed compressor. The Mitsubishi Heavy Industrial - SRK71ZE-S1
Wall Mounted (7.1kW 24000 Btu) hyper inverter saved money as it only
cost £2.88p / day to run at full capacity. The unit has excellent parts
and service back up and has an expected life span of 10 years depending
Total power of
servers: 10000 Watts
Total heat loss:
Room in Square
Meters: 1300 Watts
Total Heat Load:
The Main Key
Points to Think About When Purchasing Air Conditioning for Server Rooms:
Use inverter air
conditioning as it will save energy in the long run.
conditioning units do not work in cold weather because they do not have
an outside fan speed controller (low ambient kit)
Use an established
brand so if a part fails on you Server room air conditioning you are not
waiting 8 weeks for a part.
Sometimes it is
worth having two server room air conditioning units because if one fails
you still have some cooling.
To establish the
heat load of you servers add up all the power supplies of your serverís
rack and assume a 40% loss to heat. i.e- If you have 10 servers with
400watt power supply the total watts will be 4000 watts. assuming a 40%
loss the heat load will be 1600 watts.
Work on an average
watts per/Msq of 125watts, so if you server room is 5 x 5 meters you
will require a base of 3.5kw/12000btu + the heat load.
for server room air conditioning Mitsubishi, Daikin, Fujitsu.
If your server room
is temporary (ie short term lease on building) or has building
restrictions then portable
air conditioning maybe your only option.
If using portable
air conditioning for your server room then make sure it recycles the
water for better cooling performance of that it has a integral
We offer a complete
service to IT Managers, Building Managers and Server Room / Computer /
COMM'S room managers.
Call us for a
comprehensive quotation on
varied air conditioning manufactures to suit any budget on new
installations. We have worked with many Blue-chip organisations in
helping them develop their server room air conditioning.
Sales Installation and Service
UK: +44 (0)1234 841221
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Last updated - 17/12/2020