⚡ VFD Energy Savings Calculator

Use Affinity Laws to predict performance changes and quantify cost savings from VFD speed control.

1. Initial Fan Performance (N₁)

Initial Airflow (Q₁)

Initial Static Pressure (P₁)

Initial Fan Speed (N₁)

RPM

Initial Input Power (W₁)

2. Target Flow & Economic Input

Target Flow Ratio (Q₂/Q₁) %

Annual Operating Hours (H)

hours

Electricity Price (C_elec) per kWh

RMB/kWh

Note on Affinity Laws: The formulas used are: Q₂ = Q₁(N₂/N₁), P₂ = P₁(N₂/N₁)², and W₂ = W₁(N₂/N₁)³. The Damper Power calculation uses a simplified linear model (W_Damper = W₁ ⋅ Q_ratio) for comparison, which is a conservative estimate of the power waste in mechanical throttling. **Actual savings may be higher, but this calculation provides a strong basis for VFD implementation.**

⚡ VFD Energy Savings Calculator

1. Initial Fan Performance (N1)

2. Target Flow & Economic Input

1. Initial Fan Performance (N₁)