August 27, 2026 — Air Flow merge Sensible + Pressure (rework step 2 of 4)
Path:
Why
- Four stepper items made Sensible and Pressure feel like separate tools. Techs use one CFM for both the 1.08 equation and duct velocity.
- Two CFM / L/s pairs invited conflicting numbers. Electrical Power already merged Ohm + BTU + VD without duplicate V/W.
Stepper
- Menu is now 1. Air Flow · 2. Temp Split · 3. Fan Laws.
#pressure and old work-session step 1 open the merged Air Flow step.- CLR STEP on Air Flow clears both the sensible and pressure blocks.
Shared volume
- One
air-cfm / air-lps pair. Deleted press-cfm / press-lps.
- Calculate CFM: grey outputs from BTU + ΔT; pressure may read them with Area to fill FPM. Pressure does not write volume.
- Calculate ΔT or BTU: FPM + Area may fill the shared CFM, then sensible uses it.
- Pressure last-two stays on SP / TP / VP / FPM / Area. Typing Area still keeps SP/TP/VP/FPM.
- UX: one two-column grid. Rows: BTU / Area, CFM / L/s (always typed), ΔT °F / ΔT °C, SP / TP, VP / FPM.
- Cascade: BTU + CFM fills ΔT; CFM + Area fills FPM and VP. SP/TP still need one more reading.
- Removed the “What to calculate” dropdown. All sensible fields are typed inputs and stay live-synced.
Files
app/tools/aircalc.htmjs/airflow-engine.js, airflow-calc.jsscripts/test-airflow-live.mjs, check-aircalc-html.mjs- Help:
airflow-sensible.htm, airflow-pressure.htm, airflow-tempsplit.htm, airflow-fanlaws.htm, helpindex.htm
Cache & version
- Service worker
phvac-app-v110; aircalc script ?v=15 (one 2-col grid).
- Site version 1.1.11 at push.
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