Three-Phase Technical Comments
1) A comparison of the Three-Phase Frigitek and VFDs in evaporator fan service. (PDF)
2) Comments about using VFDs in retrofit situations (LINK)
Motor Facts
We often receive questions about how the Frigitek saves so much energy. The answer is that, beyond the basic electrical saving, when we reduce the voltage to the motor, there is also a large reduction in the heat output from the motor. In fact, for shaded-pole motors (used in most small walk-in refrigerators) the heat reduction is the source of most of the savings.
Why is this heat reduction significant, you might ask? It's because the compressor will operate less once the Frigitek is in place. The heat from the motors (all of which goes into the cooled chamber) must be removed by the compressor system. If we put less heat into the chamber, the compressor doesn't have to run as much - it's as simple as that!
But do those little motors really put out that much heat? They really do - and here's the proof. We did a series of tests on some of the most widely-used motors to see how much heat they produced, and how much that heat could be reduced by the Frigitek. The ECE test report included here shows conclusively that most of the electricity used by single-phase motors is converted directly to heat, and that the Frigitek dramatically reduces the heat from the motors.
Single-Phase Technical Comments
1) A discussion of the heat and power reduction provided by operating single-phase fan motors at reduced voltage. (PDF)
2) Comments about certain motors which cannot be operated with the Single-Phase Frigitek. (PDF)
