White Paper

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Closed-loop cooling systems
Closed-loop systems are designed specifically for cooling IT equipment. They are the best solution for
high-density systems consuming many kilowatts of power. These systems have separate cool air
distribution and warm air return paths that are isolated from the open room air. Closed-loop systems
typically use heat exchangers that use chilled water for removing heat created by IT equipment
(Figure 9).
Figure 9: Closed-loop cooling system
Since they are self-contained, closed-loop cooling systems offer flexibility and are adaptable to a wide
range of locations and environments. Closed-loop cooling systems can also accommodate a wide
range of server and power densities.
We offer two closed-loop cooling systems:
• HP Modular Cooling System
• HP Performance-Optimized Datacenter
HP Modular Cooling System
The HP Modular Cooling System (MCS) Generation 2 (G2) is a closed-loop system contained within a
modified HP 10000 Series G2 rack. Using a chilled water supply and integrating a heat exchanger,
the HP MCS G2 can cool IT equipment consuming up to 35 kW. The system is entirely self-contained.
Heat
exchanger
Basic requirement:
Chilled water supply
Heat
exchanger
Chilled
water
cooling
system