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

Stage 7 of 14 / Calculation

Select heat rejection and cooling equipment

Size cooling units and heat rejection from the calculated duty, and expose the water and ambient assumptions behind the selection.

  • Advanced
  • 14 stages
  • 16 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
  • Size cooling units against duty, reserve and topology.
  • Quantify post-failure cooling capacity and the load it can still serve.
  • State when water consumption applies and when it does not.

The engineering

The cooling plant is sized from the required duty including reserve and the selected unit rating. The topology check requires a spare unit for N+1 or two full paths for 2N. Post-failure capacity is reported separately from installed capacity.

Chiller performance is never invented. The learner supplies design COP at a stated ambient and a COP sensitivity. The energy stage uses those values hour by hour. If the selection cannot support an honest result, the model reports missing inputs instead of a hidden default.

Water is calculated only for heat rejection that actually evaporates water. The estimate uses latent heat, cycles of concentration and drift. It is a screening water balance, not a permit application. Air-cooled and dry heat rejection report no evaporative demand in this boundary.

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

A cooling equipment schedule and a heat-rejection concept with its water boundary.

Stage assumptions, limits and sources

Provenance

Assumptions

  • Chiller COP is a user-supplied design value, adjusted by the stated ambient sensitivity.
  • Cooling units share duty equally.
  • Evaporative make-up is estimated from latent heat, cycles and drift.

Constraints

  • No vendor performance curve, chiller selection or water permit is produced.

Limitations

  • No condenser approach, fouling, refrigerant, noise or water-treatment design.
  • No part-load chiller sequencing or thermal storage.

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: cooling-equipment