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简体中文HVAC Retrofit Case Study: Upgrading Traditional AHUs with EC Fan Wall Technology
In a recent Beijing Hengrui’s hotel HVAC retrofit project, several existing MAU/AHU units were still operating normally — but their long-term operating costs and maintenance demands had become increasingly difficult to ignore.
The original system used traditional belt-driven AC fans, resulting in:
Instead of replacing the entire AHU system, the project focused on upgrading the air-side structure itself.The solution: Converting the units into a fan wall configuration using EC fans from ebm-papst.
One of the upgraded units originally operated at:
Additional reductions included belt replacement costs,bearing maintenance ,labor costs and auxiliary control equipment consumption.
Across multiple units, the estimated annual energy savings exceeded 90,000 RMB.But beyond energy savings, the bigger value came from:
In HVAC retrofit projects, upgrading the fan alone is not enough.The real challenge is how fan selection, airflow behavior, and existing system constraints work together under actual operating conditions.
Beijing Hengrui supports HVAC retrofit projects through application-focused fan selection and system-level optimization, helping existing systems achieve more reliable and energy-efficient performance without full replacement.
We’re also seeing more facilities re-evaluating traditional belt-driven systems in favor of EC fan wall solutions.
Have you encountered similar retrofit challenges in older AHU or MAU systems?Let’s talk.
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