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A DDC-based capacity controller of a direct expansion (DX) air-conditioning unit for simultaneous indoor air temperature and humidity control. II. Further development of the controller to improve control sensitivity.

Author(s) : LI Z., DENG S.

Type of article: Article, IJR article

Summary

The development of the novel direct digital control (DDC)-based capacity controller for a direct expansion (DX) air conditioning (A/C) unit having variable-speed compressor and supply fan to simultaneously control indoor air temperature and relative humidity in a conditioned space served by the DX A/C unit has been reported in Part I of this two-part series (see this Bulletin, reference 2006-3122). The results of preliminary controllability tests for the novel capacity controller presented in Part I, however, suggested that the controller developed was operational, with acceptable control accuracy but rooms for improvement with respect to control sensitivity. This second part reports on the further development of the controller to improve its control sensitivity and the associated controllability test results. Both control accuracy and reasonable control sensitivity were achieved by incorporating a traditional proportional-integral controller into the DDC-based capacity controller.

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Pages: 124-133

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Details

  • Original title: A DDC-based capacity controller of a direct expansion (DX) air-conditioning unit for simultaneous indoor air temperature and humidity control. II. Further development of the controller to improve control sensitivity.
  • Record ID : 2006-3123
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 30 - n. 1
  • Publication date: 2007/01

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