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Systems & Data Center · Intermediate

ASHRAE Thermal Guidelines

ASHRAE TC 9.9 recommendations for data center temperature and humidity, with a recommended inlet range of 18-27 degrees C.

Definition

ASHRAE defines recommended and allowable envelopes and equipment classes (A1-A4, plus H1 for high-density). Measurements are taken at server inlets, and running warmer within the envelope reduces cooling energy.

Example

Supply air setpoints are raised from 20 to 24 degrees C to save energy while staying within the recommended range.

Exam tip

Temperature is measured at the server inlet, not the room return air.

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