Numerator: Annual Site Water Usage
The complete quantity above the fraction bar.
Read this term in its guide →Published equation contexts
Why this formula appears here
Water usage effectiveness fills that second gap, introduced by the same organization a few years before this decade’s AI buildout made it urgent: . reported in litres per kilowatt-hour and deliberately built to use “the same value… as the denominator for this new metric” as PUE, “to both ensure the metrics stay linked and speed their adoption” [ 6 ] . WUE exists because the cheapest way to reject a given amount of heat is very often evaporative — cooling towers and adiabatic assistance work against the wet-bulb temperature rather than the dry-bulb temperature, so they can reach a lower effective cooling temperature for less fan and compressor energy than a fully dry system…
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Denominator: IT Equipment Energy
The complete quantity below the fraction bar; it must be nonzero for this division.
Read this term in its guide →How to interpret it
With a fixed numerator, increasing a nonzero denominator reduces the fraction. Read it with the definitions, units, and assumptions supplied by the article.
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Published contexts (1)
A symbol can carry a different meaning in another article. Each occurrence keeps its own guide and term definitions.
Equation 6 · Datacenters
AI Datacenter Power and Cooling: A First-Principles Introduction
This equation states an equality: the expressions on both sides have the same value under the article’s assumptions.
Water usage effectiveness fills that second gap, introduced by the same organization a few years before this decade’s AI buildout made it urgent: . reported in litres per kilowatt-hour and deliberately built to use “the same value… as the denominator for this new metric” as PUE, “to both ensure the metrics stay linked and speed their adoption” [ 6 ] . WUE exists because the cheapest way to reject a given amount of heat is very often evaporative — cooling towers and adiabatic assistance work against the wet-bulb temperature rather than the dry-bulb temperature, so they can reach a lower effective cooling temperature for less fan and compressor energy than a fully dry system…
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