Do not present facility PUE as the whole efficiency story: add an optional server-overhead factor (sPUE) to the energy model and show an 'effective PUE' = PUE x sPUE next to PUE.
Idle servers gave sPUE > 4; on a Dell R640 under rising CPU load the average sPUE was 3.1 and the lowest 2.7.
In waste-heat use, first match technology to source temperature (heat pump 20-55 °C, absorption cooling 30-85 °C) and think of electricity, heat, cooling and storage together rather than a single technology.
Heat pumps for WHR are listed for source temperatures of 20-55 °C and absorption refrigeration for 30-85 °C.
In the sustainability panel compute operational CO2e = IT MWh x PUE x grid EF, with a grid-EF catalog by country/region (default US 454 kg CO2e/MWh incl. upstream) and a renewable-PPA toggle.
Total GHG falls from 84,100 to 11,300 t CO2e (-87%).
Take AI rack and node power assumptions (3.4 to 12.2 kW per 8-GPU server, 20% idle) as a cross-check on IT load models, not as a substitute for vendor data.
U.S. data centers used about 76 TWh (1.9% of U.S. electricity) in 2018 and 176 TWh (4.4%) in 2023.
Design the facility to operate within the ASHRAE Class A2 allowable range and require A2 operation within warranty in IT procurement; plan separate environmental zones (practice 5.3.4) for legacy equipment.
IT equipment AC/DC power converters should be rated at 90% efficiency or better across expected load ranges.
In the operations module attach a maintenance strategy and default PM interval (quarterly/semi-annual/annual) to each catalog asset class, with a condition-based monitoring option.
In the commissioning and operations module, generate a TCS fluid-quality test plan with these acceptance limits (conductivity, pH, turbidity, total viable count) at fill and at periodic intervals (default quarterly).
Weigh the supply air setpoint against server fan energy: raise it in small steps within the ASHRAE recommended range so the most demanding inlet nears 80 °F, only after air management is in place, and control to IT inlet temperature rather than return temperature.
Compute racks reached 60 kW in 2013, and recent liquid-cooled racks exceed 125 kW.
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