* Posts by tr7v8

6 publicly visible posts • joined 1 Jun 2010

Swedish data centre offers rack-scale dielectric immersion cooling


Re: This would only work for cloud computing

Nope, you just remove the one server. Then dependent on coolant if its something like Novec you fix it immediately if it is oil then you let it drain & then service it. The later is one of the issues with using oil as a cooling medium


Coolants used are typically things like 3M Novec which is actually used as an extinguishing liquid or synthetic oils. No chance of condensation as you design so it doesn't go through dew point.

As regards heat out if you can achieve an inlet temp in the 50s then you can use it to provide building heating via an underfloor system, generally using a heat exchanger.

Even at lower temps you can use a heat exchanger to raise the outlet temp. to enable heat reuse. Minor problem is that generally when you want maximum DC cooling is in the summer & yu don't need building heating then.

Some issues are technology lock in. You're beholden to whatever server model & technology they use. Also if using oil servicing is a truly horrible job. Novec is much better but is horrifically expensive, $50 a litre when I last looked.

Oh, the weather outside is frightful, but the data centre temp's delightful


I do DC design, audit & troubleshooting for Dell across EMEA. We regularly get asked to convert Watts or KiloWatts to BTu and not just UK customers either. Tons of cooling is still used occasionally in the US but not by us.

Generally for cooling it is Kilowatts, although Temps are quoted in Deg F & Deg C. Airflow is interesting I see Cubic Feet per Minute, Cubic Metres per Hour, Litres per second & other variations on a them.

Luckily I'm old enough to have been taught Imperial & the variations on Metric so can normally sort it out enough to get an answer for the customer.

I always quote Murphy's Law. Units will always be expressed in the least usable form. For example "speed will be expressed as Furlongs per fortnight!"

Dell finds liquid cooling tech on eBay, now wants you to buy it


Re: Call out break-fix now requires a plumber too

Water has been in DCs for years, in the 80's big mainframes used it to cool CPU modules. (Dell employee but not directly associated with the Tech)


Re: Hey, what could possibly go wrong with ...

Yup normal working pressure is 70PSI as I understand it.

(Dell employee but not directly associated with the Tech)

Blunkett threatens to sue for £30 ID card refund


Schaedenfraude in my view

Surely he must have seen this coming......