Posts by tr7v8 6 publicly visible posts • joined 1 Jun 2010
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.
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!"
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