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Efficiency improvements of air-cooled chillers equipped with high static condenser fans.

Author(s) : YU F. W., CHAN K. T., CHU H. Y.

Summary

This paper presents a simulation study on how to increase the COP of an air-cooled screw chiller equipped with high static condenser fans. A thermodynamic chiller model was developed and validated using the operating data and specifications of the chiller. It includes an algorithm which makes use of a set point of condensing temperature to determine the number and speed of condenser fans staged to provide the heat rejection airflow required for any given operating condition. The simulation results show that reducing the condensing temperature as low as possible is incapable of maximizing the chiller COP when the rated condenser fan power is high by up to 77 W per kW cooling capacity. To minimize chiller power, the condensing temperature should be reset in response to the increase of condenser fan power and changes of chiller load and outdoor temperature. Depending on the load conditions, the chiller COP could increase by 1.7-84.8% when variable speed condenser fans and the optimum set point of condensing temperature are applied to existing air-cooled screw chillers. This study provides important insights into the low-energy design and operation of air-cooled chillers.

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Details

  • Original title: Efficiency improvements of air-cooled chillers equipped with high static condenser fans.
  • Record ID : 2007-1689
  • Languages: English
  • Source: 2006 Purdue Conferences. 18th International Compressor Engineering Conference at Purdue & 11th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
  • Publication date: 2006/07/17

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