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Equation 1 · Part 2 · Comparing the Main Approaches to AI Datacenter Power and Cooling

Symbol E_IT

WUEsite=VwaterEIT\mathrm{WUE_{site}} = \frac{V_{\mathrm{water}}}{E_{\mathrm{IT}}}
EITE_{\mathrm{IT}}

What this part means

the electricity delivered to IT equipment, giving WUE units of litres per kilowatt-hour rather than PUE’s dimensionless ratio [ 4 ].

Its job in the formula

EIE_IT occurs below the fraction bar. The quantity above the bar is divided by this expression; zero is excluded as a denominator.

Where the article explains it

where VwaterV_{\mathrm{water}} is total on-site water consumption in litres and EITE_{\mathrm{IT}} is the electricity delivered to IT equipment, giving WUE units of litres per kilowatt-hour rather than PUE’s dimensionless ratio [ 4 ] .

The passage around this formula

…the metric LBNL uses throughout its modeling, is defined analogously to the more familiar Power Usage Effectiveness: WUEsite=VwaterEIT\mathrm{WUE_{site}} = \frac{V_{\mathrm{water}}}{E_{\mathrm{IT}}}. where VwaterV_{\mathrm{water}} is total on-site water consumption in litres and EITE_{\mathrm{IT}} is the electricity delivered to IT equipment, giving WUE units of litres per kilowatt-hour rather than PUE’s dimensionless ratio [ 4 ] . What LBNL’s simulations across roughly 965 US weather stations and multiple facility archetypes show is that this number is driven overwhelmingly…

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Learn the underlying idea

A subscript is a label attached below a symbol. It often selects a time step, component, category, or member of a sequence.

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Sources cited in the surrounding passage

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