The engineer’s reference desk
841–864 / 1,044 sources
BRE Global 2012
In existing-site assessments, show the legacy scheme when the user records a BREEAM DC 2010 certificate.
BRE Global 2019
Metering rule: if projected PUE is below 1.2 require IT-level (PUE3) metering; at 1.2-1.5 require at least PDU-output (PUE2); otherwise UPS-output (PUE1) is acceptable.
Schneider Electric 2024
Add an efficiency-degradation factor to the opex model for run-to-fail operation (+19%/+29%/+39%/+51% cooling energy in years 2 to 5) against the maintained case.
Schneider Electric 2013
Use this paper as the template for the Design Basis form: target average kW per rack, peak kW per rack (default 2x average), density uncertainty (default 15%), managed power ratio (default 0.7) and reserve space (default 15%).
Schneider Electric 2017
Implement as the default heat-load calculator: Q = IT + (0.04 x UPS + 0.05 x IT) + (0.01 x UPS + 0.02 x IT) + 14.32 x area + 100 x people
Schneider Electric 2011
Use it as a quick-sizing calculator in novice mode: take IT kW, future kW, floor area, cooling type and UPS input type, and output service kW/A and generator kW, with the multipliers as editable defaults.
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Schneider Electric 2019
Use as a seed for the TCO/capex comparison engine: liquidTechPremiumUsdPerW = 0.77 and chillerCrahSavingsUsdPerW = 0.91 (immersion).
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
Honeywell Analytics Year not stated
In the fire module model the NFPA 75 base package as mandatory items and clean agent and VESDA as optional add-ons with cost.
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.
European Commission (Official Journal of the European Union) 2024
Build the metering architecture to the regulation: meters on every supply input for total energy (grid and back-up generator separately) and at every UPS output for IT energy, with a system that retains measurement point and device records for at least 10 years.
Schneider Electric 2011
When topology is 2N but some loads are single-corded, require a rack ATS per single-corded device by default.
Schneider Electric 2016
Offer N, isolated redundant, N+1, distributed redundant (catcher/STS), tri-redundant, 2N and 2(N+1) in the topology library, and label availability values as comparative rather than absolute.
Schneider Electric 2023
Add a dielectric-fluid catalog with family (hydrocarbon, fluorocarbon), phase (1p, 2p), flash point, boiling point, GWP, PFAS status, cost per litre and annual loss percentage.
Schneider Electric 2022
In the single-line builder, raise a warning when the transfer switch has 4 poles and the UPS neutral is not separately derived.
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.
Schneider Electric 2020
Use C-rate-dependent usable energy (Peukert-like) in the battery runtime calculator rather than nameplate kWh.
IEEE (Energy Efficient HPC Working Group paper; hosted by Lawrence Berkeley National Laboratory) 2021
Use the eight-section outline as the skeleton for the controls part of an Owner's Project Requirements before the Basis of Design starts.
Schneider Electric 2026
Add an OT-network section to the design: each monitored device class carries a protocol list and an IEC 62443 certification flag.
U.S. DOE FEMP 2025
For a small data center or server room, write metering, air management and monitoring requirements into the specification from the start, given that energy management in this class tends to be poor.
Lawrence Berkeley National Laboratory 2014
Borrow the metric set (PUE, intake temperature and humidity, RTI, cooling efficiency, airflow efficiency, distribution efficiency) as the minimum list of measurements a monitoring design must support.
Open Compute Project Foundation 2026
For a new site, write the POI LVRT/HVRT envelope and the PFAPR requirement (90% within 2 s) as design criteria, and settle which voltage measurement (line-to-neutral or line-to-line) governs during protection coordination with the utility.
Open Compute Project Foundation 2024
Build the metering plan so that PUE can be reported at the highest category possible, with IT load measured at PDU or equipment input rather than the UPS output where feasible.
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