The new system was designed and installed by Devault Refrigeration, which selected a Danfoss EKC331T electronic controller to control the output of a Vilter reciprocating compressor, which is used if the lead Frick screw compressor is in anti-recycle delay and unable to turn on, or if additional cooling capacity is required.
“The controller from Danfoss allowed us to provide a unique control strategy and the company provided excellent support during the entire process,” said Bill Sauer, project engineer at Devault Refrigeration.
A Danfoss AKC21W temperature sensor monitors the refrigerant’s leaving temperature to determine when the compressors need to run. Brian Davis, Director of Sales at Danfoss Industrial Refrigeration, is pleased about the result.
“We were able to provide the link between the screw and reciprocating compressors to achieve stable control and efficiency,” he says.
The result is a far more energy-efficient end environmentally-friendly refrigeration solution.
The new system now runs entirely on propylene glycol as refrigerant and uses 25% less energy compared to the original 250,000 kWh a month used by the old setup.
In addition, the new system is safer for employees, the juice and the environment, as the 5500 pounds of ammonia and 30,000 gallons of brine that were used in the old system are no longer needed.