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Measuring the performance of a variable-speed drive retrofit on a fixed-speed centrifugal chiller.

Author(s) : LENARDUZZI F. J., YAP S. S.

Summary

Variable-speed drives (VSDs) offer many advantages in a heating, ventilating, and air-conditioning (HVAC) system. However, they are seldom used with centrifugal chiller systems. One of the reasons for the low number of VSDs in chiller systems is unfamiliarity with these systems. This research project was initiated to establish a base of accurate and detailed information for building owners and HVAC consultants to realize the benefits of VSDs. A 200 hp variable-speed drive was retrofitted to a 615-kilowatt centrifugal chiller and monitored for one cooling season. Results show that VSD operated without problems during the test period and successfully met the air-conditioning requirements of the building. Energy savings are estimated to be approximately 41% at this particular site. The power quality effects also were studied and do not appear to be a concern. The total harmonic distortion is less than 2.5%.

Details

  • Original title: Measuring the performance of a variable-speed drive retrofit on a fixed-speed centrifugal chiller.
  • Record ID : 1999-3786
  • Languages: English
  • Source: ASHRAE Transactions. 1998 annual Meeting, Toronto, Ontario + CD-ROM.
  • Publication date: 1998
  • Document available for consultation in the library of the IIR headquarters only.

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