HVAC 3D Design Learning Studio

HVAC3D is a professional-grade HVAC reference and learning tool built around an interactive 3D model of a fully engineered 3-story commercial building. Tap any component — AHU, chiller, VAV box, DDC controller — to see its specs, code references, and system connections in real time.
Version 3.0 adds six major tools:
Duct Sizing Calculator — SMACNA equal-friction and velocity method sizing for round and rectangular ducts, with live ASHRAE velocity and friction limit checking.
ASHRAE 62.1 Ventilation Calculator — Multi-zone Ventilation Rate Procedure (VRP) with space-type lookup from Table 6-1, zone-by-zone breathing zone OA, and system outdoor air (Vot) output.
Hydronic Pipe Sizing — Darcy-Weisbach pipe sizing for chilled water, hot water, and condenser water. Input GPM, tons, or MBH and get a recommended pipe size with Reynolds number and friction factor.
Sequence of Operations Library — Six complete BAS control sequences: Economizer, DCV, Supply Air Temperature Reset, Morning Warm-Up, Chiller Staging, and VAV Box Control — all per ASHRAE Guideline 36.
A2L Refrigerant Safety Guide — 2025 installation requirements for R-454B and R-32 including detector placement, machinery room ventilation, charge limits, and EPA AIM Act compliance per ASHRAE 15-2022.
PDF Export — Share the Equipment Schedule, ASHRAE 180 Inspection Checklist, and Calc Sheets as formatted PDFs via AirDrop, email, or Files.
The full feature set includes:
3D interactive building model • Floor-by-floor and system filtering • Component info panels with code citations • Learning Hub (Quiz, Glossary, Fault Simulator, Load Calculator, Guided Tour, Violations, Inspection Checklist) • Psychrometric Chart (SI + IP) • System Design Wizard • Refrigerant Phase-Out Guide • Floor Plans • Riser Diagrams • Equipment Schedule • Operation Matrix • Gallery of 49 professional HVAC diagrams
Standards covered: ASHRAE 62.1 / 90.1 / 15 / 180 / Guideline 36 • IMC • SMACNA • ACCA Manual J • NFPA 90A / 92 / 96 • EPA AIM Act

For educational and reference use only. All system designs must be reviewed and stamped by a licensed mechanical engineer before implementation. ASHRAE, SMACNA, NFPA, ACCA, ANSI, ASME, IMC, IBC, UL, and EPA are trademarks or registered trademarks of their respective organizations. HVAC3D is an independent educational application and is not affiliated with, endorsed by, or sponsored by any of these organizations. All standard references are cited for informational purposes only and do not constitute legal or engineering advice.