Topic guide
Explore sources on rack layouts, power density and IT equipment interfaces. Review technical notes to understand how mechanical, electrical and cooling requirements meet at the rack level.
145–168 / 191
Schneider Electric 2012
Drive the cooling-architecture recommender: for a new build with IT load above 200 kW, default to room cooling + hot-aisle containment
Open Compute Project Foundation 2023
Require each vendor to fill in the parameters of importance tables for cold plates, hoses, quick disconnects, loops, manifolds and CDUs so offers can be compared.
Open Compute Project Foundation 2020
Check the delivery route against rack height plus 0.5 m, door and corridor widths, and the lift capacity, before agreeing to host or design for Open Racks.
Schneider Electric 2011
When topology is 2N but some loads are single-corded, require a rack ATS per single-corded device by default.
Vertiv 2017
In A/B (2N) racks keep each feed's design load at or below rating x 0.8 (80%-rated breaker) x 0.5; for single phase usable kW = V x I x 0.8 x 0.5.
ASHRAE TC 9.9 2016
Encode the A1-A4 table (dry bulb, dew point, altitude derate) as the canonical envelope lookup; site max inlet = classMax - (altitude-900)/derateStep.
Vertiv 2023
Calculation default: DLC flow = 1.5 L/min per kW of liquid-captured heat; to adjust by dT use flow = P/(4.18 x dT) L/s.
Schneider Electric 2011
Have the TCO engine report cost per rack and per kW over a user-selectable life (default 10 years) and split capex from opex.
European Commission JRC 2020
Ask in the specification for a designed PUE (dPUE) at a stated IT load (for example 50%) and conditions, under ISO/IEC 30134-2 or EN 50600-4-2, and write PUE demonstration at handover and the commissioning test into the contract.
Open Compute Project Foundation 2026
Check that the facility's AC feed (480, 415 or 400 V, single or dual) and the rack power range match the planned IT block, including up to 1.1 MW per sidecar and the parallel option.
NREL 2019
Use the measured capture fractions (98.3%, 93.4%, 86.1%) to estimate the residual air load for a fixed cold plate rack, remembering that power shelves, CDUs and switches stayed air-cooled.
U.S. EPA / ENERGY STAR 2024
Write ENERGY STAR Version 4.0 certification and the PSU efficiency steps (at 10% to 100% load points) into the server procurement specification; look especially at 10% and 20% load efficiency for redundant supplies that run lightly loaded.
Schneider Electric 2014
Make the primary density inputs per rack: avgRackKw and peakRackKw per row or zone, default peak/avg 2
Schneider Electric 2026
Add an AI cluster design profile with rack defaults of 750x1,200 mm, 48U, static 2,270 kg and dynamic 1,600 kg.
Schneider Electric 2024
Build an rPDU selector: from rack kW, voltage, phases and redundancy, compute PDU count with an 80% (NA) or 100% (IEC) factor.
Open Compute Project Foundation 2023
Compare vendor offers on the same template: request W32 footprint density (kW/m2), full-solution static floor load, ceiling clearance and non-IT power per kW of IT in writing.
Open Compute Project Foundation 2025
When sizing TCS capacity against electrical capacity, state the cold-plate capture fraction (70-80%) and target delta-T (10 or 20 C) explicitly, and use the roughly doubled delivery at 20 C (4,845 versus 2,422 kW) as design headroom.
Schneider Electric 2025
Model CDUs as catalog items with exchange type (LA, LL, LR), form factor (rack, floor), capacity kW, approach temperature, flow L/min and redundancy.
Open Compute Project Foundation 2019
Use the parameter tables for cold plates, CDUs, manifolds, couplings and pumps as the data sheet checklist when comparing vendor solutions.
Open Compute Project Foundation 2026
Select size (02-08) by rack or server loop flow: rated flows run from 2.27 to 17.79 L/min; estimate pressure drop from the Cv range and ask for correction or extra testing where the fluid differs from water.
Open Compute Project Foundation 2020
Compare the bill of materials of a server to be immersed (cable jackets, heat-shrink, EPDM capacitors, CMOS battery, relays, thermal paste) against the paper's problem table and obtain a compatibility statement from the fluid supplier for each item.
Open Compute Project Foundation 2026
Base floor and transport-route load checks on the 8,000 lb rack and the 15,000 lb rack-plus-sidecar combination, and include the weight of the moving equipment.
Open Compute Project Foundation 2022
In rack delivery and placement planning, check the 10-degree entry and 15-degree exit ramp angles, the 25.4 mm floor gap and the 4 mm step as rolling limits, and obtain door and shipping dimensions from the rack vendor separately.
Open Compute Project Foundation 2026
Size rack feeds by option: two independent 60 A NEC or 63 A IEC circuits, protection suited to 40 kA available short-circuit current at the tap-box, and no PDU in between.
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