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繁體中文Reducing HVAC Fan Energy in a Carbonated Beverage Plant: A Practical Upgrade Story
07/15/2026Energy projects sometimes focus on chillers while leaving air movement unchanged. In many facilities, however, supply and exhaust fans operate for long periods and continue at high speed even when demand has fallen. A retrofit delivered by AISA PACIFIC SHENGRUI LIMITED for a large carbonated beverage production plant illustrates how better fan selection and control can address this hidden load.
The first step was not to select a new fan. It was to understand how the existing equipment was being used. Beverage processing and filling areas depend on stable ventilation, cleanliness, temperature, and humidity. Demand varies between production zones, so fixed high-speed operation can waste energy and create airflow imbalance. The review therefore included filters, dampers, leakage paths, duct transitions, operating schedules, and the difference between design demand and current demand.
Available project information showed that The source record contains before-and-after measurements for eight PAU/AHU units. Air volume was rebalanced to actual zone demand, while operating power was reduced substantially. Recorded unit-level savings ranged from approximately 28% to 69%. One unit increased useful airflow while power fell from about 5.34 kW to 1.66 kW; another was rebalanced from about 17.09 kW to 7.58 kW. These figures provided a traceable engineering reference, while final selection remained subject to measurement and verification.
The retrofit strategy combined efficient EC technology with airflow-path improvement. Rather than replacing motors on a one-for-one nameplate basis, the team reviewed outlet area, air velocity, current, voltage, and measured volume for each unit. EC fans and control points were selected individually, followed by system balancing to match process demand with suitable operating margin. This avoided the common mistake of installing a fan with an attractive free-air rating but insufficient pressure capability inside the real unit.
Control logic was equally important. EC fans can respond directly to speed commands, but efficiency gains depend on using that capability. Minimum ventilation, temperature or pressure feedback, scheduled setback, soft starting, and fail-safe operation were considered so that the fan would not simply run at maximum speed throughout the day.
Savings were created through efficient EC motors, removal of belt and transmission losses, and demand-based speed control. Better operating data also gives maintenance teams an earlier indication of filter loading or abnormal system resistance.
From a maintenance perspective, AISA PACIFIC SHENGRUI LIMITED considered the removal or reduction of belt-related service, easier access to fan modules, and clearer operating feedback. Trending speed and power can also help identify rising system resistance before it develops into a comfort or process complaint.
A credible retrofit closes the loop with commissioning. Airflow, pressure, power, sound, vibration, and zone conditions should be tested at representative loads. When those results are connected to operating hours and local electricity cost, the owner receives a realistic business case rather than a theoretical efficiency claim.
Frequently Asked Questions
What savings were recorded across the beverage plant units?
The eight recorded PAU and AHU duties showed unit-level fan energy savings of approximately 28% to 69%, depending on airflow and operating point.
Where do EC fan energy savings come from?
Savings can come from efficient motors, direct drive, reduced mechanical losses, improved airflow paths, and speed control that follows actual demand.
Does an EC fan retrofit require changes to the control system?
Usually yes. The project should define speed commands, minimum ventilation, sensor feedback, alarm handling, and fail-safe operation with the existing controls or BMS.
How can maintenance requirements change after the retrofit?
Direct-drive EC fans can remove belt adjustment and replacement tasks, while speed and fault feedback can make developing airflow problems easier to identify.
How should long-term savings be verified?
Compare power and operating hours under equivalent loads, and normalize results for airflow, pressure, occupancy, production level, weather, and filter condition where relevant.
