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Stage 10 of 15 / Calculation

Account for plant utilities and cooling

Show balance-of-plant and cooling auxiliary power as explicit utilities, not as a hidden adder on stack kWh/kg.

  • Advanced
  • 15 stages
  • 12 min
  • Process and energy systems
In development Green Hydrogen Plant
Draft development workbench (noindex). These stages are exercisable on a direct development route for learning and review. The journey remains a draft: not published, excluded from search/sitemap by existing protections, and not independently engineering-approved. Quantitative outputs are screening/educational where implemented and must not be treated as certified design, OEM guarantees, project approval, or bankable results.
Professional review required.Engines and workbench are implemented for draft development use. Defaults, sources, heating-value basis and engineering assumptions still require independent review. The journey must not be published or sitemap-indexed from this phase. Current verification state: Needs engineering review.

After this stage you can

Learning objectives
  • Separate BOP kW from cooling auxiliary kW.
  • State waste heat as stack power minus H₂ LHV power.
  • Name which utilities remain unmodelled.

The engineering

Balance-of-plant kilowatts are the owned auxiliary input: water pumps, HVAC, controls and other plant loads inside the hydrogen battery limit you choose. Cooling auxiliary is modelled as a fraction of stack waste heat, where waste heat is stack power minus hydrogen LHV power.

That cooling ratio is an assumption, not a chiller COP map. If you have equipment data, change the ratio or fold proven loads into BOP. Do not bury them in the stack specific-electricity figure.

Transformer, rectifier and grid-connection losses are outside the stack unless you enter them as BOP.

EngiMetric / green hydrogen educational workbench

Green Hydrogen Plant — Educational Screening Workbench

Loading the hydrogen project state...

Draft development workbench (noindex). Inputs are saved in this browser only. Calculations shown are screening/educational outputs from the existing model where implemented; missing or unsupported quantitative areas remain explicit. Completing stages records self-declared learning progress only — it is not quantitative engineering capability, not an OEM guarantee, and not industrial/project approval.

Stage

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Inputs

Saved in this browser

Edit the screening inputs for this stage, then calculate. Values you enter are marked as user-entered in the local project state; defaults remain illustrative until replaced.

Screening results

Educational model output

Results come from the existing hydrogen screening model. Unsupported quantitative areas, missing evidence, and review requirements remain explicit; outputs are not certified design or approval decisions.

Process & balance context

Textual screening views

This educational workbench presents stage-specific calculated outputs and limitations. Detailed interactive diagrams are not required for journey completion; use the stage results and assumptions panels to review boundaries, flows, energy, storage, and economics context.

Assumptions, limitations & review

From journey definition

Your deliverable for this stage

Capstone evidence

A utilities statement with BOP and cooling power called out.

Stage assumptions, limits and sources

Provenance

Assumptions

  • Cooling power is a fixed fraction of stack waste heat.
  • BOP is a design-point kW, not a load list.

Constraints

  • Cooling ratio is checked against a 20–60 % screening band.

Limitations

  • No chiller, cooling-tower or heat-rejection equipment sizing.
  • No instrument-air, nitrogen or chemical-dosing model.

Review status

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

Stage progress is stored in this browser only. The explanation and every limit on this page remain readable with JavaScript disabled; the calculators need it to run.

Stage kind: Calculation / Journey: green-hydrogen / Stage: utilities