Datacenter Thermal Guidelines: ASHRAE_A4
ASHRAE TC9.9 thermal environment guidelines for datacenter equipment classes (A1-A4, B, C, HI air-cooled; W17-W45 liquid-cooled) — recommended and allowable operating envelopes for inlet dry-bulb temperature, humidity, dew point, elevation, and rate of change. Also includes IEEE 3003.2-2014 grounding electrode resistance, conductor impedance, shock voltage, and voltage drop data; IEEE 3003.1-2019 grounding method selection table; and IEEE 3004.11-2019 dual-tie bus differential protection fault scenarios.
| standard class | parameter | allowable max | allowable min | envelope | recommended max | recommended min | unit |
|---|---|---|---|---|---|---|---|
| ASHRAE_A4 | dry_bulb_temp_allowable | 45 | 5 | allowable | — | — | degC |
| ASHRAE_A4 | dry_bulb_temp_recommended | — | — | recommended | 27 | 18 | degC |
| ASHRAE_A4 | max_dew_point_upper_allowable | 24 | — | allowable | — | — | degC |
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