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Medium-voltage switchgear, transformer and cable trays in an electrical plant room

Stage 8 of 14 / Calculation

Build the energy model and PUE statement

Calculate annual facility energy from a genuine 8,760-hour model and state PUE with a defined boundary.

  • Advanced
  • 14 stages
  • 20 min
  • Mission-critical electrical and thermal systems
Development preview AI Data Center: Full Engineering Workbench
Development preview. The calculations on this journey run on existing EngiMetric engines, but the journey text and scope have not completed independent engineering review. The route is excluded from search while it remains a preview.
Professional review required.Engines and workbench are implemented and tested. Defaults, sources and engineering assumptions still require independent review before publication or use on a real project. Current verification state: Needs engineering review.

After this stage you can

Learning objectives
  • Calculate annual IT, cooling, auxiliary, loss and facility energy.
  • State PUE with its boundary and distinguish modelled from measured values.
  • Decide whether emissions and water metrics are supportable with the supplied data.

The engineering

PUE is a ratio, not a badge. The model defines the boundary as IT energy plus cooling plus electrical losses plus auxiliary load. Offices, external lighting and tenant loads are outside the boundary unless the user expands the inputs. The report repeats the boundary next to the number.

The hourly model uses a synthetic weekday/weekend IT shape scaled to preserve annual IT energy. Ambient temperature is a synthetic seasonal and diurnal wave. Cooling COP is adjusted from the design point by the supplied sensitivity. Cooling plant power is heat divided by COP plus fan and pump power. The result is a modelled estimate, not a metered PUE.

Emissions are reported only when the user supplies an explicit grid factor. No default factor is applied. Water intensity is reported only for evaporative heat rejection. The stage also shows monthly energy and PUE so seasonal behaviour is visible.

EngiMetric / AI data-center workbench

One project, computed from rack to report

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Preview screen. Inputs are saved in this browser only. Climate, grid, water and cost values are illustrative. Failed checks stay visible; a clean summary is not a stamped design and no Tier rating is claimed.

Your deliverable for this stage

Capstone evidence

An annual energy statement, monthly PUE table and a resource-claim boundary note.

Stage assumptions, limits and sources

Provenance

Assumptions

  • The IT shape is synthetic and preserves annual energy.
  • Ambient temperature is built from design, annual-average and diurnal inputs.
  • Electrical losses scale with IT load; auxiliary load is constant at the supplied factor.

Constraints

  • Modelled PUE, not measured performance.
  • No emissions result without an explicit factor.

Limitations

  • No measured weather year, humidity or economiser hours.
  • No hourly workload trace or demand response.
  • No site water balance or treatment metering.

Review status

  • Needs engineering review
  • Professional review is required before publication or use as a design basis.

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Stage kind: Calculation / Journey: ai-data-center / Stage: energy-pue