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Propeller fans on the evaporator coil run between 60% to 80% of the time in coolers and freezers. Typically these fans have only one speed – full-on – however, full airflow is only required about half of the time. Inexpensive controllers are available that automatically slow these fans when full-speed operation is unnecessary.

Affordability

For single-phase controllers, prices start at about $500 and installation costs are typically about $100 per unit. Three-phase applications can be considerably more expensive, particularly if you need to control fans from multiple evaporators.

Cost savings

In field tests for controllers from one manufacturer, documented savings varied from 10% to 60% of overall refrigeration energy.

Environmental considerations

Reducing energy consumption means fewer energy generation plants need to be built, which reduces land disturbance, road construction and greenhouse gas emissions.

What you need to know

  • Controllers do not work for every application. Talk to your refrigeration service provider or manufacturer to ensure they will work with your refrigeration system.
  • Controllers, and the installation, for single-phase fans are relatively inexpensive and usually highly cost-effective.
  • Most controller manufacturers offer tools to help evaluate the cost-effectiveness of the application of their products.

FAQ

Does the addition of controllers have a negative effect on product quality in a walk-in cooler?
No. Anecdotal evidence suggests that the use of automated freezer systems can improve product quality in walk-in coolers. Because less air is circulated when the fan speed is reduced, items such as flowers, produce or meat do not dehydrate as readily. However, the controllers must be interfaced to the refrigeration circuit to avoid evaporator coil freeze-up.

Buyer's Guide

Learn more about walk-in cooler controllers and ice makers.

Resources

Get better informed about energy-efficient equipment, practices and incentives.

Last Modified: Aug 12, 2009

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