Advanced Ventilation Acoustics Calculator

FSRS Rectangular Straight Silencer - Corrected Formulas

🎯 Enhanced Features:

✓ Corrected pressure drop formulas with adjustable coefficients
✓ Discrete cassette counting (no fractional cassettes)
✓ Real-time validation warnings for unrealistic configurations
✓ Empirical calibration from test data
✓ Engineering limits enforcement

System Parameters

System Type:

Silencer Placement:

Air Volume Q (l/s):

Silencer Dimensions

Width W (mm):

Height H (mm):

Length L (mm):

Gap Width (mm):

Pressure Drop Coefficients (Advanced)

K_friction Coefficient: Default: 0.0115 (adjustable with test data)

K_entrance Base: Default: 0.045

K_exit Base: Default: 0.5

Use Default Coefficients

Fan Selection

Fan Model:

Manual Override Lwi

Silencer Product Selection

Product:

Fan Lwi & Base Silencer IL (dB)

Frequency (Hz)	63	125	250	500	1000	2000	4000	8000
Fan Lwi
Base IL

Calibration & Test Data Integration

📊 Purpose: Upload or enter real test data from silencer measurements to calibrate the pressure drop formulas. This allows the calculator to match actual performance data and improve accuracy.

Method 1: Upload Test Data (CSV)

CSV Format Requirements:

Width_mm,Height_mm,Length_mm,Gap_mm,Airflow_ls,Measured_Pressure_Pa,Measured_Velocity_ms 600,400,1000,75,300,150,4.2 400,400,1000,75,200,120,3.5 ...

Upload Test Data CSV:

Method 2: Manual Test Data Entry

Width (mm):

Height (mm):

Length (mm):

Gap Width (mm):

Airflow (l/s):

Measured Pressure Drop (Pa):

Measured Velocity (m/s) [optional]:

Loaded Test Data

No test data loaded

Current Formula Configuration

Pressure Drop Formula:
ΔP = (K_entrance + K_friction + K_exit) × (ρ × v_gap²) / 2

K_entrance = 0.045 / (1 + h/d)
K_friction = 0.0115 × (L / h)
K_exit = 0.5 × (1 / (1 + h/d))²

Where:
• h = gap_width/2 [mm]
• d = cassette_width/2 = 100 mm
• L = Length [mm]
• ρ = 1.2 kg/m³

Room Acoustics Calculator

⚠️ No silencer data available. Please calculate silencer performance first or enter custom sound power levels.

Room Dimensions

Room Length (m):

Room Width (m):

Room Height (m):

Temperature (°C):

Room Surface Materials

Add Surface Material

Surface Name:

Material Type:

Area (m²):

Absorption Coefficients (α)

63Hz	125Hz	250Hz	500Hz	1kHz	2kHz	4kHz	8kHz

Current Room Surfaces

No surfaces added yet

Input Sound Power Levels (Lw)

Use data from Silencer Calculator

Frequency (Hz)	63	125	250	500	1000	2000	4000	8000
Sound Power Lw

Duct Velocity & Design Analysis

Duct Parameters

Duct Width (mm):

Duct Height (mm):