In large power electronics industrial parks, AHU/MAU systems often operate under continuous high-load conditions — where airflow stability, energy efficiency, and system reliability directly impact daily operations.

Yet many facilities are still relying on traditional belt-driven fan systems, which gradually lead to higher energy consumption, increased maintenance, and limited airflow control.

Recently, we supported an AHU retrofit evaluation project for a large-scale power electronics industrial park, upgrading traditional fan systems to high-efficiency EC fan wall solutions.

The existing AHU systems were operating with:

In addition, long-term belt wear introduced:

For high-load industrial HVAC environments, these issues directly impact operational cost and system reliability.

The upgrade plan replaced the original belt-driven system with an EC fan wall solution using backward-curved centrifugal EC fans.

The goal was simple:

Maintain the original airflow and static pressure requirements

while significantly improving overall system efficiency.

Target operating conditions included:

      • Airflow: 60,000 m³/h

      • Static pressure: up to 1700 Pa

      • Continuous industrial operation

Pic.1 Comparison photo taken before and after renovation

♦ Measured Improvement Results

Under equivalent operating conditions, the upgraded EC fan wall achieved substantial energy savings. The table below outlines the measured performance data across three typical operating scenarios:

Pic.2 Energy saving and consumption reducing effect

            

Beyond power reduction, the retrofit also improved: airflow stability/ controllability/ maintenance accessibility/ system cleanliness/ operational redundancy (system stays online even if a single fan fails.

♦ A Growing Trend in Industrial HVAC Upgrades

Across data centers, industrial facilities, and high-efficiency HVAC projects, Beijing Hengrui is seeing a growing shift toward EC retrofit solutions — especially in applications where energy efficiency, controllability, and lifecycle cost are becoming critical priorities.

And in many retrofit projects, the challenge is no longer simply “moving air.”

It’s about:

     • optimizing airflow efficiency,

     • reducing operational cost,

     • and improving long-term system reliability.

♦ Let’s Exchange Insights

Have you faced similar challenges with traditional belt-driven AHU systems in industrial facilities?

We’d be interested to hear how others are approaching EC retrofit projects, airflow optimization, or HVAC energy reduction in industrial environments.