The Frigitek is an energy saving device designed for walk-in or industrial refrigerators and freezers.
The purpose of a refrigeration compressor and related equipment is to pump heat out of a box. Often, more than 30% of that heat is generated by the evaporator fan motors. Frigitek reduces this heat load approximately 75-80% by lowering the voltage to the evaporator fan motors when the box is not being actively cooled. The result is a significant saving in operation costs. The dramatic energy saving produced by the Frigitek have been confirmed by more than ten years of extensive laboratory and field testing and satisfied customers.
Lowering the voltage on a compressor motor, or any motor driving a fixed load, will cause the motor to draw excess current and overheat. But, lowering the voltage on a motor with a variable load, such as a fan, will not cause the motor to draw more current. This is because, as the motor power is reduced, the motor turns slower, and the slower rotation of the fan reduces the load which the motor must drive. Thus the motor does not draw more current. Tests in our laboratory confirm that, when operating fan motors at lower voltages, they draw less current and produce significantly less heat. This reduces the operating cost of both the fan motors and the compressor.
The single-phase Frigitek is designed to be used in walk-in refrigerators and freezers typically found in food-service businesses, florists, and markets. Reach-in coolers with storage behind the doors can also benefit from the Frigitek. Industrial-size coolers normally use the three-phase Frigitek. Frigiteks are not applicable to HVAC systems, home air-conditioners, or small, stand-alone reach-in boxes.
The Frigitek does not interfere with the refrigeration cycle nor directly control the compressor, thus it cannot harm the compressor or any of the other equipment. Because operation of the Frigitek causes the compressor duty cycle to be reduced, it can only have a beneficial effect on the equipment and should extend its life accordingly.
The Frigitek follows the thermostat's cycling of the system to control the speed of the fans in the evaporator coils, and does not directly affect any other portion of the refrigeration system. The refrigeration system continues to function normally.
While there are a number of conditions that affect the amount saved by Frigitek in any particular installation, typical energy and cost savings are in the 25-35% range.
The actual dollar savings resulting from use of the Frigitek will depend on the cost of electricity in your area. For an electricity cost of 12 cents per kilowatt-hour, typical payback time for a Single-Phase Frigitek is about 18 months; for a Three-Phase unit, about 12 months.
Installation time is typically about 45 minutes to one hour for Single-Phase systems, and may average two hours for Three-phase equipment. Only qualified persons, familiar with electrical wiring, should do the installation of the Frigitek.
For installation information, see the appropriate Single-Phase or Three-Phase manual elsewhere on this website.
A five-year warranty on all Frigitek equipment is found in the back of each owner's manual.
The Frigitek will not contribute to any tendency for the evaporator coils to ice up. Because it operates the fans at high speed whenever the system is in cooling mode, the evaporator heat transfer characteristics are unchanged. In fact, the Frigitek has an Ice Sensor feature, which will continue to operate the fans at high speed if ice is detected in the coils.
Extensive testing, and actual customer experience, verify that there is more than adequate air movement to prevent stratification with the fans running at low speed under Frigitek control.
The Frigitek should outlast your refrigeration system. Properly installed, there is no reason for it to fail under normal operation.
For certain applications, other benefits can equal or exceed that of energy savings. The reduced air movement extends the shelf life of perishables such as meat, fish, produce, pizza dough, and flowers, by slowing the dehydration process. In addition, the reduced running of the compressor will add to its lifetime, putting off the day that this expensive unit will need to be replaced. And, in large industrial warehouses, the reduced fan noise contributes to a safe work environment.
Single- and Three-Phase Frigiteks are available for all voltages in common use in the United States, including 480 VAC single-phase.
The Frigitek can be used on some pressure-controlled systems. Contact your sales representative or ECE for details.