Author Archives: Henry Hsu

About Henry Hsu

In many different capacities at Raritan, Henry Hsu has consulted with data centers all over the United States through two building cycles -- with particular focus on power and infrastructure management. Beyond the data center, Henry is an avid photographer and gadget nerd. He earned his undergraduate degree in economics and computer science; and graduate degree in industrial engineering, both from Stanford University.

How to Calculate Current on a 3-phase, 208V Rack PDU (Power Strip)

Problem Statement In recent years, extending 3-phase power distribution all the way to server cabinets and racks has become extremely popular in new data center builds — for many good reasons. Principally, for cabinet power capacities above 5kVA, utilizing 3-phase … Continue reading

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Google Discloses Datacenter PUE of 1.21

While Google has typically closely-guarded details regarding their datacenters as a competitive advantage, the company recently disclosed a weighted-average PUE of 1.21. This is nothing short of astounding; one datacenter even posted a quarterly average PUE of 1.13! Google shares … Continue reading

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