racks below about 10 kW. Today’s high-density IT racks can generate significantly more heat, creating hot spots that need supplemental cooling or specific air channeling. Letting the entire facility run colder to compensate for hot spots is not a cost-effective option.

The increasing heat loads require carefully planned cooling strategies such as hot-air containment and closed-loop cooling. We designed the HP 10000 G2 Rack Air Duct and the HP Modular Cooling System G2 around these strategies to improve cooling efficiency and eliminate hot spots.

HP 10000 G2 Rack Air Duct

The HP 10000 G2 Rack Air Duct increases cooling efficiency by containing hot air at the rear of the rack. The Rack Air Duct channels hot exhaust air directly into the air return system, eliminating hot air recirculation and mixing with the cold air (Figure 3). The Rack Air Duct increases the temperature of the air returned to the computer room air handler (CRAH), allowing more efficient heat transfer. Strategically, less mixing of hot and cold allows you to better and more predictably cool your IT systems. For example, you can increase cooling efficiency by raising the CRAH output temperature or the chiller water temperature with fewer unexpected side effects. You can also add new loads or move old ones with fewer problems.

The HP 10000 G2 Rack Air Duct also has some other distinct advantages:

It has no moving parts.

It can be retrofitted into existing data centers that use HP racks.

It can increase efficiency enough to support cooling 10-15 kW rack configurations.

Figure 3: HP 10000 G2 Rack Air Duct

HP Modular Cooling System G2

The HP Modular Cooling System (MCS) G2 is a ―closed loop‖ system that can cool two 17.5 kW racks or one rack up to 35 kW. The MCS G2 lets you add computing power without adding to the data center heat load. It extends the life of your facility when floor space is limited, when you need to isolate existing high-density racks, or when you’re retrofitting an open-aisle data center. The totally enclosed airflow within the MCS G2 does not affect other racks and vice versa.

The MCS G2 is highly efficient with a partial power usage effectiveness (PUE) of 1.05 to 1.07 at full load, depending on the input voltage (200 – 240v). It uses an enclosed air-to-water heat exchanger connected to the chilled water system to deliver cold air to the front of the racks. Fan modules at the rear of the rack re-direct warm air back to the internal heat exchanger where it is cooled and re-

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