The U.S. Navy successfully completed final production prototype shock and vibration testing for its new-generation high-efficiency super capacity (HESC) chiller system. The system consists of the HESC chiller and the HESC variable-speed drive (VSD), which integrate key components from Calnetix Technologies Cerritos, Calif.

The HESC Chiller was jointly developed by Calnetix and Johnson Controls Navy Systems. Calnetix was responsible for the high-speed permanent magnet motor, magnetic bearings, magnetic-bearing controller and backup bearing systems for the two-stage, variable-speed compressor at the heart of the system. Calnetix also provided the variable-speed power module and controls for the HESC VFD.

The HESC chiller/VSD, after the successful shock and vibration tests, is moving into the production phase, with the first shipboard installation on the USS John P. Murtha (LPD-26) scheduled for completion in December 2017. Other ship installations will continue production into the next decade.

HESC chillers are expected to reduce ship acquisition and life-cycle costs by increasing cooling capacity by at least 50 percent, improving reliability by more than 50 percent and reducing chiller fuel consumption by more than 25 percent. They will also reduce refrigerant leakage by 90 percent and eliminate hazardous oily waste.