Feeds

Hitachi refrigerates rack rears

Nearly no fans? Cool

Next gen security for virtualised datacentres

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. ®

5 things you didn’t know about cloud backup

More from The Register

next story
The Return of BSOD: Does ANYONE trust Microsoft patches?
Sysadmins, you're either fighting fires or seen as incompetents now
Oracle reveals 32-core, 10 BEEELLION-transistor SPARC M7
New chip scales to 1024 cores, 8192 threads 64 TB RAM, at speeds over 3.6GHz
Docker kicks KVM's butt in IBM tests
Big Blue finds containers are speedy, but may not have much room to improve
US regulators OK sale of IBM's x86 server biz to Lenovo
Now all that remains is for gov't offices to ban the boxes
Gartner's Special Report: Should you believe the hype?
Enough hot air to carry a balloon to the Moon
Flash could be CHEAPER than SAS DISK? Come off it, NetApp
Stats analysis reckons we'll hit that point in just three years
Dell The Man shrieks: 'We've got a Bitcoin order, we've got a Bitcoin order'
$50k of PowerEdge servers? That'll be 85 coins in digi-dosh
prev story

Whitepapers

Endpoint data privacy in the cloud is easier than you think
Innovations in encryption and storage resolve issues of data privacy and key requirements for companies to look for in a solution.
Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
Top 8 considerations to enable and simplify mobility
In this whitepaper learn how to successfully add mobile capabilities simply and cost effectively.
Solving today's distributed Big Data backup challenges
Enable IT efficiency and allow a firm to access and reuse corporate information for competitive advantage, ultimately changing business outcomes.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.