Cycling Refrigerated Air Dryers, 2,500 to 12,500 SCFM

Cycling Refrigerated Air Dryers, 2,500 to 12,500 SCFM

Central-plant dryers for 600 to 3,000 hp of installed compressors

Above 2,500 SCFM the dryer serves a central plant: four or six large screw compressors, or a centrifugal machine, on a sequencer that runs whatever the plant needs hour by hour. Demand in such a plant swings from a single machine on the night shift to every compressor loaded at the afternoon peak, which is precisely the profile that load-following refrigeration was built for.

Four current series use three approaches. Digital-scroll dryers unload their scroll compressors for part of every cycle, and the larger sizes split the duty across two to five refrigeration circuits. The variable-speed dryer drives inverter scroll compressors so refrigeration output tracks the air load continuously. The modular skid gangs two to six water-cooled phase-change modules behind a common header, with the redundancy a multi-module system brings.

Every model is 460 V three phase on 6 in to 12 in flanges, and every series except the skid is offered air-cooled or water-cooled.

• Rated 2,500 to 12,500 SCFM at 100 psig, 100°F inlet and 100°F ambient
• Digital-scroll, inverter-driven and modular phase-change capacity control
• 6 in to 12 in flanged headers; 460/3/60 with other voltages on request
• Networked controllers with energy monitoring on the digital-scroll and skid lines