Pairs with the generalFunctions curve-file rewrite — all supplier
curves now share one X-axis: specific air flux through the membrane,
Nm³/(h·m² membrane). specificClass._calcOtrPressure computes the flux
from the existing n_flow and i_n_elements plus a new i_membrane_area
field, and queries the OTR / DWP curves at that flux instead of at
flow per element.
i_membrane_area resolution (precedence top-down):
1. config.diffuser.membraneAreaPerElement (new optional override)
2. specs._meta.membraneArea_m2_per_element (curve-file source of truth)
3. 0.18 m² (Jäger TD-65 / GVA placeholder)
_loadSpecs now preserves the curve's full _meta block so the area
metadata reaches configure(). Output schema gains oFluxPerM2 alongside
the existing oFlowElement (kept for user-readability — both numbers
are useful on a dashboard).
_checkLimits compares specific flux against the curve's minX / maxX
(also in canonical units now), so warning / alarm thresholds remain
self-consistent.
8/8 tests pass. Verified across all 5 suppliers (gva-elastox-r,
jaeger-jetflex, aerostrip-phoenix, pik300, prk300) that the resolved
flux + SSOTR + DWP numbers match hand-computed expectations.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
37a85690d1