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The Reliable Link Between Water Circulation Systems
In The Building And The Server Rack
Water supply within a data center
poses specific challenges for the
installation of cooling water systems.
Water cooling is in fact required
due to the high discharge
of thermal energy by state-of-the-art servers. Water-cooled
server racks help to minimize the
distance between cooling systems
and servers.
Knürr CoolTherm®, the closed server
rack featuring a water-cooled circulating
air system, and
Knürr CoolAdd®, the water cooled retrofit solution for a wide variety of
current server racks produced |
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by
different
manufacturers, function
on the basis of a failure-proof
connection with the cold water
supply available in any building.
It is not however simply a matter
of diverting the existing cold
water supply into the data center.
The Knürr CoolTrans® couples the
building's main cold water circulation
system with the data center's
secondary cold water system
by means of a water-to-water heat
exchanger.
The benefits are... |
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| …the cold water flow temperature
is controlled by the dew
point temperature within the
data center. In this
way, any complex
isolation of the data
center’s water circulation
system is overcome.
At the same
time, there will be no
build-up of condensation
whilst avoiding
dehydration and
the need to humidify
the data center. |
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…since the secondary
circulation system is
operated
above freezing point, use of glycol
is no longer necessary.
The
coolers may be built to a smaller
size, while maintaining the same
level of performance, in order to
avoid further investment. |
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| …the water quantity within the
data center is controlled by the
secondary circulation system.
Even the working pressure within
the installation may be adjusted
at a lower range than in the primary
system. The recommended
value is approx. 2,5 bar. |
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… temperature and pressure fluctuations
within the primary circulation
system are compensated
for. The flow temperature can be
controlled as a constant and adjustable
value. |
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| …the option of monitoring the
secondary circulation system, including
failure alarm management,
protects constant
operation and reports technical
faults within the installation. |
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Naturally,
there is a spare back-up for
all moving parts. |
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| In addition, the relatively high
flow temperature of 12°C and
over allows for a high degree of
free cooling in many climate
zones, resulting in energy savings.
In these cases, the system's
capacity factor, i.e. the ratio between
cooling performance and
power consumption, increases
drastically. The Knürr CoolTrans®
allows the mixture of cold water
produced by free cooling with the
main cold water supply. |
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Knürr CoolTrans® is available in the 50, 75 and 100 kW power class.
It indispensable
for the safe operation of
water-cooled racks by controlling
• the precise volume
• optimum pressure and
• the required temperature. |
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 Knürr CoolTrans® MicroSite |
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| Technical Data: |
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| Capacity |
Width |
Hight |
Depth |
Pipe Connection |
Differential
Pressure: ext. |
Elec. Connection
Power |
Water Volume
Flow |
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primary |
secondary |
primary |
secondary |
50 Hz |
primary |
secondary |
| 50 kW |
450 mm |
1010 mm |
820 mm |
1¼" |
5 x 1" |
1,5 bar |
0,7 bar |
230 V; 0,8 kW |
8,42m³/h |
7,16m³/h |
| 75 kW |
450 mm |
1010 mm |
1200 mm |
1½" |
5 x 1" |
1,5 bar |
1,1 bar |
400 V; 1,8 kW |
12,78m³/h |
10,74m³/h |
| 100 kW |
1640 mm |
1890 mm |
600 mm |
2xDN100 |
2xDN100 |
1,4 bar |
1,2 bar |
400 V; 1,6 kW |
16,79m³/h |
14,30m³/h |
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Primary Circuit |
Secondary Circuit |
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Conditions of Setup Site:
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Also Available:
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| Temperature Supply: |
4 – 8°C |
12 – 14°C |
Capacity 50 respectively 75 kW
(air conditioned room)
capacity 100 kW (any) |
• Pumps - 60 Hz
• 2 heat exchangers for free cooling
• Redundant electric feed |
| Temperature Return: |
11 – 14°C |
18 – 20°C |
| Operating Pressure: |
16 bar |
6 bar |
| Antifreeze Agent: |
up to 35% |
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Note: Further temperatures and diff. pressure possible on request |
| Specification subjects to change without notice / errors and omissions excepted / Electrical data as operating power input |
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