3 Device description
EN
6
Rittal Liquid Cooling Package
3
Device description
3.1
General functional description
The LCP Hybrid is essentially an air/water heat exchang-
er. It cools the room by cooling the hot air from devices
in a server enclosure to the ambient temperature. This
prevents the temperature at the installation site from ris-
ing as a result of heat loss from the IT components. To
this end, the device is fitted to the rear of a server enclo-
sure.
Air routing follows the "front to back" cooling principle,
and is effected by the device fans built into the server en-
closure. The expelled warm air is routed through the air/
water heat exchanger of the Liquid Cooling Package. To
this end, the fans of the built-in 482.6 mm (19") equip-
ment must be capable of overcoming the airside pres-
sure loss from the LCP Hybrid.
Fig. 1:
Air routing on the LCP Hybrid – Side view
Key
1
Cold ambient air
2
Server rack with installed equipment
3
Hot airflow from 482.6 mm (19
"
) equipment
4
LCP Hybrid with air/water heat exchanger
5
Cooled air
Immediately in front of the heat exchanger is a row of
heat pipes. These heat pipes support even distribution
of the thermal load over the entire height of the heat ex-
changer.
In the heat exchanger, the thermal energy (heat loss
from the devices) is transferred to a cold water system.
There, the air is cooled and then flows out into the am-
bient air at the rear.
be
ne
Server
erver
r
HD
Patchpanel
Patchp
p
panel
Patchpanel
Patchp
panel
HDD
D
Patchp
p
panel
Server
Server
Server
Switch
S
Serv
L
CP Hybrid
Server rack
1
2
3
4
5
Note:
The water inlet temperature must always be
selected (controlled) to be above the dew
point for the existing ambient temperature
and humidity in the data centre. The dew
point can be found in the Mollier h-x diagram
(fig. 2).
Furthermore, we advise compliance with the
ASHRAE standard "ASHRAE TC 9.9, 2011
Thermal Guidelines for Data Processing Envi-
ronments".
Note:
As an alternative to use of the h-x diagram, in
section 13.2.2 "Determination of the dew
point", you will find tables showing the dew
point for selected temperatures and air hu-
midity levels.
