Feeds

Hitachi refrigerates rack rears

Nearly no fans? Cool

Combat fraud and increase customer satisfaction

Hitachi is mounting refrigerators on the rear doors of racks to suck out heat at a much lower cost.

The Hitachi Data Centre Solutions Group idea, announced at yesterday's Datacenter Dynamics conference in London, is to treat a rack as a quasi-refrigerated cabinet and have its heat turn refrigerator liquid into a gas.

Air is pulled through the rack by fans set into the rear door and heats the dual coil air-refrigerant-heat exchangers fixed to it. Continuing evaporation pushes the gas along pipes to a heat-exchanger where it loses its heat, turns back to liquid and is then gravity fed back to the rear door refrigerator unit.

Colocation operator Telehouse West is using this NC (Natural Circulation) system and likes the idea of a natural circulation with no pumps and compressors needed. In its London Docklands facility the gas is piped to a riser shaft in the building and passes through a chilled water heat exchanger, giving up its heat as it returns to a liquid state, and then flows back to the rack it started out from.

Bob Harris, Technical Services Director for Telehouse, said: "This system uses only a very small amount of fan power to move the air. So the coefficient of performance (COP) of the system is 43.5. For every kilowatt of power you put in it produces 43.5 kilowatts of cooling capacity. Normally for a data centre you get 5 to 6 kilowatts out for every kilowatt in. The Hitachi scheme is extremely more efficient."

Hitachi also has an in-row unit that uses the same principle to cool a row of racks. Its COP is 29.5. Harris said: "The door unit cools ten kilowatts and the in- row unit cools 23 kilowatts. At the 2.3 normal rack level there is a marginal differential. Beyond that the in-row unit is more effective."

There are other rack-level cooling technologies but they all use use pumps or compressors, Hitachi being unique in its approach. Harris said the rear door unit can be deployed to a number of different vendor's racks, which Telehouse West has already done. It can attach to a 600mm wide unit or an 800mm one or other rack widths.

He said: "It's very easy to install [and] connect to existing chilled water networks that were there. You need no more skills than those needed for a water-cooled rack. The benefit is that there is no water associated with it at the rack position. It's a refrigerant gas. As a data centre operator we don't like water and customer equipment to mix."

Hitachi can supply the technology as a complete system or as components, and there is built-in redundancy at the component level. ®

3 Big data security analytics techniques

More from The Register

next story
This time it's 'Personal': new Office 365 sub covers just two devices
Redmond also brings Office into Google's back yard
Kingston DataTraveler MicroDuo: Turn your phone into a 72GB beast
USB-usiness in the front, micro-USB party in the back
Dropbox defends fantastically badly timed Condoleezza Rice appointment
'Nothing is going to change with Dr. Rice's appointment,' file sharer promises
BOFH: Oh DO tell us what you think. *CLICK*
$%%&amp Oh dear, we've been cut *CLICK* Well hello *CLICK* You're breaking up...
AMD's 'Seattle' 64-bit ARM server chips now sampling, set to launch in late 2014
But they won't appear in SeaMicro Fabric Compute Systems anytime soon
Cisco reps flog Whiptail's Invicta arrays against EMC and Pure
Storage reseller report reveals who's selling what
prev story

Whitepapers

SANS - Survey on application security programs
In this whitepaper learn about the state of application security programs and practices of 488 surveyed respondents, and discover how mature and effective these programs are.
Combat fraud and increase customer satisfaction
Based on their experience using HP ArcSight Enterprise Security Manager for IT security operations, Finansbank moved to HP ArcSight ESM for fraud management.
The benefits of software based PBX
Why you should break free from your proprietary PBX and how to leverage your existing server hardware.
Top three mobile application threats
Learn about three of the top mobile application security threats facing businesses today and recommendations on how to mitigate the risk.
3 Big data security analytics techniques
Applying these Big Data security analytics techniques can help you make your business safer by detecting attacks early, before significant damage is done.