Calculator
Enter stream flows and purities. Flows share the same basis. Purity applies to gas streams; “pure equivalent” inputs are already hydrogen-only.
Example data table
A realistic sample case to verify your setup.
| Item | Value | Notes |
|---|---|---|
| Fresh hydrogen | 1000 Nm³/h @ 99.9% | Typical make‑up |
| Recycle gas | 3000 Nm³/h @ 75% | Hydrogen-rich recycle |
| Recovery gas | 400 Nm³/h @ 90% | Recovered from offgas |
| Consumption (pure eq.) | 2200 Nm³/h | Reaction demand |
| Purge/Vent | 600 Nm³/h @ 55% | Loss to fuel/flare |
| H₂ in products | 30 Nm³/h | Exported in products |
| Dissolved loss | 15 Nm³/h | Solubility/entrainment |
| Accumulation | 0 Nm³/h | No inventory change |
If your result differs, confirm units and purities first.
Formula used
All streams are converted to pure hydrogen equivalents.
Pure hydrogen for a stream
H₂(pure) = Flow × (Purity ÷ 100)
Use purity for mixed gases. For “pure equivalent” fields, purity is assumed 100%.
Overall balance
In − Out − Accumulation = 0
Accumulation is storage change. Positive means extra hydrogen is required.
Make‑up required
Max(0, Out + Acc − In)
Shows shortfall after accounting for all demands and inventory change.
Key performance indicators
Utilization = Consumption ÷ In
Loss fraction = Losses ÷ In
Useful consumption excludes purge and exported hydrogen.
Conversions used: 1 kmol H₂ = 22.414 Nm³, and 1 Nm³ H₂ = 0.08988 kg.
How to use this calculator
- Choose a flow basis and keep all inputs consistent.
- Enter each source stream’s flow and hydrogen purity.
- Enter demands as pure equivalents for consumption, products, and dissolved losses.
- For purge and other mixed sinks, provide flow and purity.
- If storage changes, enter accumulation (positive or negative).
- Press Calculate to view results and download reports.