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Project Case｜Full VFD Retrofit of Central Air‑conditioning in Office Buildings

2026-09-03

In commercial office buildings, shopping malls, hotels and public facilities, fans, chilled water pumps, cooling water pumps and cooling tower fans account for the largest energy consumption within the entire HVAC system. Conventional setups run motors continuously at full‑speed mains frequency. Air dampers and control valves regulate air volume and water flow, wasting substantial electric power through throttling resistance. Such systems also suffer from unstable indoor temperature, heavy motor start‑up shock and high maintenance costs.

After retrofitting with variable frequency drives, the system receives real‑time load signals from temperature, pressure differential and CO₂ sensors. Built‑in closed‑loop PID control automatically adjusts motor speed to deliver air and water flow on demand. Following the fan and pump affinity laws, motor power drops significantly when rotation speed is reduced, cutting overall energy use dramatically. VFDs also smooth motor start‑stop cycles, extend equipment service life and deliver stable indoor comfort with lower operational expenditure.

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