GRC & Minimus Servers Blog

GRC’s Oil Immersion Cooling System at PIC Supports Data Processing for The Large Hadron Collider at CERN

Posted by Dhruv Varma on April 19, 2017

PIC in Barcelona, Spain shares key performance and reliability results from its immersion cooled data-intensive cluster.

[April 19, 2017 – Austin, TX] Green Revolution Cooling (GRC), a leader in immersion cooling, today announced key performance and reliability results from its installation at Port d’Informació Científica (PIC) in Barcelona, Spain. The ultra-efficient cluster installed in October 2015 has since been used to process dozens of Petabytes of data from CERN's Large Hadron Collider, and leading-edge astrophysics projects.

Read More

Topics: data center efficiency, hardware, cost, cost optimization, efficiency, power, data center, News & Events, sustainability, reliability, press release

Transformer Efficiency

Posted by Christiaan Best on June 8, 2016

Transformer Efficiency: Is it worth it?

PUE often encompasses all of the losses from the utility down to the server. This includes transformers that convert power down to 400 or 208, 3 phase power. To get an understanding of your "total" efficiency, transformer efficiency and costs have to first be understood.

Here are few things of interest to data center operators:
  • There are several factors that affect transformer inefficiency (electrical losses):
    • Hysteresis due to charging the field in the iron core (which is NOT proportional to load).
    • Line losses through the coil (which are proportional to load).
  • There are several different type of transformers:
    • "Standard temperature rise" – More efficient at partial loads, where data centers actually operate.
    • "Low temperature rise" – This means there is a low surface temperature (less heat coming off the transformer). These transformers have larger iron cores, which make them more efficient at transferring energy at high loads, but less efficient at partial loads, where data centers actually operate.
    • DOE 2016” – In the US, the Department of Energy released a new efficiency standard for all transformers sold. These transformers are more efficient across the board.
Below, Figure 1 shows a typical efficiency curve for a 225 kVA transformer from Square D. This is juxtaposed against older, standard temperature rise, and low temperature rise transformers.

Figure 1: Transformer efficiency curves for standard, low temperature, and DOE 2016 type transformers
Read More

Topics: data center efficiency, transformers, cost, efficiency, power