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Comparing constant-speed and variable-speed centrifugal chillers.

Author(s) : SULLIVAN B.

Type of article: Article

Summary

This column compares the performance of a typical constant-speed, two-stage centrifugal chiller with a comparable variable-speed centrifugal chiller at similar price points. In an attempt to do a comparative performance benefit based on similar chiller price, the
base efficiency of the constant-speed chiller was improved by 10% by taking the additional dollars spent on a variable-speed drive and applying it to improve the design performance for the constant-speed unit (generally in the form of more effective heat exchangers). In addition, a 3% efficiency penalty was used for the variable-speed chiller to account for inverter losses. The overall performance for the constant-speed chiller is 13% better than that of the variable-speed chiller at design conditions.

Details

  • Original title: Comparing constant-speed and variable-speed centrifugal chillers.
  • Record ID : 30013957
  • Languages: English
  • Source: ASHRAE Journal - vol. 56 - n. 12
  • Publication date: 2014/12

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