Patent ID: 7661274
Filing Date: 2010-02-16
Classification: F25B,Y02B

Abstract:
1. A multiple compressor chiller system comprising: a plurality of compressors, each compressor of the plurality of compressors being driven by a corresponding motor; at least one refrigerant circuit comprising at least one compressor of the plurality of compressors, a condenser and an evaporator connected in a closed loop; a variable speed drive to power the corresponding motors of the plurality of compressors, the variable speed drive comprising a converter, a DC link and a plurality of inverters each electrically connected in parallel to the DC link and each powering a corresponding motor of the plurality of compressors; and a control panel to control the variable speed drive to generate a preselected system capacity from the plurality of compressors, the control panel being configured to determine a number of inverters of the plurality of inverters to operate in the variable speed drive and configured to determine an operating frequency for the number of operating inverters of the plurality of inverters in the variable speed drive to generate the preselected system capacity from the plurality of compressors.