๐Ÿ’จ Steam Humidifier & Absorption

Calculate steam injection rates (kg/h), boiler power, and non-wetting absorption distance (m) to prevent duct condensation and mold growth per ASHRAE 62.1.

โšก Fortran 90 Engine Double Precision (IEEE 754) โœ“ ISO / ASME Validated
Steam Humidifier & Absorption Hvac
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๐Ÿ’พ Downloads 339 ๐Ÿ“ฆ Fortran Code 4.4 KB
๐Ÿ“… Released Jun 2026
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โšก TOOLS & REPORTS:
๐Ÿ’พ Download Fortran 90

๐Ÿ’จ AHU Steam Dispersion Manifold & Non-Wetting Absorption Plume

Real-time visual simulation of steam micro-jet discharge & absorption distance envelope (D_abs)

๐Ÿ“ Configuration & Presets

๐Ÿข Office Winter (20% -> 45%) ๐Ÿฅ Hospital ICU (6-Tube Grid) ๐Ÿงช Single Wand Tube (15% -> 40%) ๐Ÿ“ฐ Printing Press (60% RH)
๐Ÿ’จ AHU Airflow & Duct Cross-Section
๐Ÿ’ง Relative Humidity Targets & Manifold
Multiple tubes drastically shorten D_abs
ASHRAE 62.1 Formulations:
โ€ข Steam Rate: mฬ‡steam = mฬ‡air ยท (wโ‚‚ โˆ’ wโ‚) ร— 3600 [kg/h]
โ€ข Absorption Distance: Dabs โˆ (1 / Ntubes0.75) ยท vair ยท [ (RHโ‚‚ โˆ’ RHโ‚) / (100 โˆ’ RHโ‚‚) ]0.65 [m]
โ€ข Electric Power: P = mฬ‡steam ยท hfg / 3600 [kW]

๐Ÿ“Š Humidification Results

Configure inputs and click Compute to view results.

๐Ÿ“˜ Calculation Methodology & ASHRAE 62.1 Standards

Non-Wetting Absorption Distance

Visible steam plumes must fully absorb before reaching duct obstructions (elbows, filters, silencers) to prevent stagnant liquid pooling and biological mold growth:

Dabs โˆ (1 / Ntubes0.75) ยท vair ยท [ ฮ”RH / (100 โˆ’ RHโ‚‚) ]0.65

Multi-Tube Rapid Dispersion Grids

Distributing steam across multiple vertical headers with engineered precision nozzles shortens absorption distance by up to 75% compared to single-wand injection.

Key Engineering Assumptions

  • Atmospheric dry saturated steam at $100^\circ\text{C}$ ($h_{fg} = 2257\,\text{kJ/kg}$).
  • Electric resistive or electrode boiler thermal efficiency $\eta \approx 95\%$.
  • Isothermal humidification process along dry bulb lines.