This document provides information on upgrading walk-in cooler and freezer motors and fan blades to improve energy efficiency. It describes replacing standard shaded pole motors with electronically commutated motors (ECM) that use permanent magnet technology and electronic controls to maintain a constant speed. It also replaces aluminum fan blades with optimized carbon fiber blades that reduce load on the motor while delivering air more efficiently. The upgrades reduce energy consumption from 135 watts to 20 watts, saving over 1000 kWh per year and $110, resulting in a 85% reduction in wattage.

1. Utility Rate 0.11
301 W. 73rd St.
Kansas City, MO 64114
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Application
Walk-In Coolers and Freezers
Energy Conservation Measure
Electronically Commutated Motors (ECM)
Carbon Fiber Fan Blade
An EC motor is more efficient than a motor that uses the shaded pole or Permanent Split Capaictor (PSC)
type technology. This is due to the fact that the motor is a permanent magnet motor which has fewer losses
losses than a standard induction motor. With an integrated electronic control, similar to a Variable Frequency
Drive (VFD) in larger applications, the motor can be programmed to operate in various modes. For the
walk-in cooler and freezer, the motors are programmed to maintain a constant speed
The FridgeWize carbon fiber blade has optimized the shape to optimize for air delivery while reducing the
load on the motor. The carbon fiber blade construction is also resilient to bending and cold temperature
environments.
Savings
Shaded Pole Watts with Aluminum Fan Blade 135 watts
Electronically Commutated Motor (ECM) with Carbon Fiber Blade 20 watts
Annualized Savings 1007 kWh
110.81$ Savings/Year
85% Reduction in Watts
221.63$
40
261.63$
Savings may vary due to variables such as utility rates, variables in equipment, walk-in dimensions, and environmental factors, etc.