valveConductance

Conductance m_flow/dp of a valve with a fixed resistance in series, its flow law linearized as Buildings does (linearized=true): m_flowm_flow_nominal = k^2dp, 1/k^2 = 1/kFixed^2 + 1/(phiKv)^2*

FastSmoothBuildings.Utilities.valveConductance, function (source)

Purpose

Conductance G = ṁ/Δp of a valve and a fixed resistance in series, the flow law linearized as Buildings does with linearized = true.

Equations

G = 1 / (ṁ_nom (Δp_fix,nom/ṁ_nom² + Δp_val,nom/(φ ṁ_nom)²)),

that is ṁ ṁ_nom = k² Δp with 1/k² = 1/k_fix² + 1/(φ K_v)², k_fix² = ṁ_nom²/Δp_fix,nom, K_v² = ṁ_nom²/Δp_val,nom. Fully open (φ = 1), the valve passes ṁ_nom under Δp_val,nom + Δp_fix,nom.

Use

φ must stay positive: the valves give the characteristic of equalPercentage, at least its leakage.

Revisions

• October 2026: moved from trano's FastModel.Utilities.