๐ช Air Curtain Aerodynamics
Determine air curtain Foster Deflection Number (Dn), AMCA 220 aerodynamic sealing efficiency, doorway infiltration reduction, and heating/cooling energy saved.
โก Fortran 90 Engine
Double Precision (IEEE 754)
โ ISO / ASME Validated
Hvac
๐ Solver Telemetry
โ ACTIVE
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43
โก Solves
34
๐พ Downloads
306
๐ฆ Fortran Code
4.4 KB
๐
Released
Jun 2026
โฑ๏ธ Latency
< 1 ms
๐ช Overhead Air Curtain Planar Jet Barrier & Deflection
Real-time visual simulation of downward turbulent jet resisting outdoor thermal & wind infiltration๐ Configuration & Presets
๐ Supermarket (H=2.8m, 11.5 m/s)
โ๏ธ Cold Storage (-20ยฐC / +20ยฐC)
๐ Loading Dock (H=4.5m, 20 m/s)
๐๏ธ Retail Quiet (8.5 m/s)
AMCA 220 Formulations:
โข Deflection Number: Dn = (ฯi bโ vโยฒ cos ฮฑ) / [ g Hยฒ |ฯo โ ฯi| + ยฝ Cp ฯo vwยฒ H ]
โข Sealing Efficiency: Eseal โ 70% to 85% in optimal range (0.15 โค Dn โค 0.40)
โข Thermal Energy Saved: Qsaved = Eseal ยท mฬinfilt ยท cp ยท |Ti โ To| [kW]
โข Deflection Number: Dn = (ฯi bโ vโยฒ cos ฮฑ) / [ g Hยฒ |ฯo โ ฯi| + ยฝ Cp ฯo vwยฒ H ]
โข Sealing Efficiency: Eseal โ 70% to 85% in optimal range (0.15 โค Dn โค 0.40)
โข Thermal Energy Saved: Qsaved = Eseal ยท mฬinfilt ยท cp ยท |Ti โ To| [kW]
๐ Air Curtain Performance Results
Configure inputs and click Compute to view results.
๐ Calculation Methodology & AMCA 220 Standards
Foster Deflection Criterion
The Deflection Number $D_n$ compares the downward planar jet momentum against the opposing transverse forces of thermal buoyancy and wind pressure:
Dn = (ฯi bโ vโยฒ cos ฮฑ) / [ g Hยฒ ฮฯ + ยฝ Cp ฯo vwยฒ H ]
Optimal Barrier Operation
When $0.15 \le D_n \le 0.40$, the air curtain reaches the floor with sufficient momentum to split cleanly, preventing up to 85% of conditioned air loss.
Key Engineering Assumptions
- Standard planar turbulent turbulent jet expansion angle $\approx 14^\circ$.
- Fan combined motor and aerodynamic efficiency $\eta = 60\%$.
- Outward nozzle discharge angle $\alpha = 15^\circ$ to counteract inward draft.