KAPLEVENT
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Questionnaire

Pressure drop ΔP calculation from the ζ factor

ΔP from the ζ of your source — without "typical" coefficients

Pressure drop ΔP from ζ

ζ comes from the datasheet or another source for a specific model. No ζ — no calculation.

ζ comes from the model datasheet or a supplier calculation for that specific model and duty. Typical values are never substituted.

For example: “model X datasheet, table 3”. Optional, but it makes verification easier.

—Па

Enter ζ, ρ and v_ref. Worked example (educational only): ζ=2, ρ=1.2, v=3 → ΔP=10.8 Pa. ζ=2 is not a “KAPLEVENT norm”.

Pressure drop across the sectionA duct section with a mist eliminator: total pressure before the unit is higher, after — lower by ΔP; formula ΔP = ζ·ρ·v²/2.ΔP = ζ · ρ · v² / 2before the unitafter the unitζ — from the datasheet/source, not a typical value
## Method ```text ΔP = ζ × ρ × v_ref² / 2 [Pa] ``` ζ is a dimensionless resistance coefficient of the **specific model** at a given reference section. ρ is the density of the medium at operating conditions. v_ref is the velocity in the same section to which the ζ is referenced (face or free — state it in the questionnaire). ## Worked example ζ = 2 (entered by a person), ρ = 1.2 kg/m³, v_ref = 3 m/s → **ΔP = 10.8 Pa**. This is a training input: ζ = 2 is not a "KAPLEVENT norm". ## Where to get ζ - the model data sheet or the manufacturer catalog; - a supplier calculation for your duty; - on-site measurements — with the methodology documented. ## Limitations - No ζ — no calculation: the tool does not substitute "typical" values and does not generate curves. - ΔP depends on velocity nonlinearly (v²): recalculate to the operating point, do not transfer values "from memory". - Interpolation of a data sheet curve is allowed only between verified points of one model and duty, without extrapolation.