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Stability limit of room air temperature of a VAV system.

Author(s) : MATSUBA T., KASAHARA M., MURASAWA I., et al.

Summary

When conventional PID (proportional-integral-derivative) controllers are replaced with new digital controllers by selecting the same PID parameters as before, the control loops have often got into hunting phenomena. Unstable control characteristics are thought to be one of the crucial problems faced by field operators. The PID parameters must be carefully selected to avoid instabilities. In the study, a room space is simulated as a thermal system that is air-conditioned by a variable-air-volume control system. A dynamic room model is developed. To explore the possible existence of huntings, a numerical system model is formulated and a parametric analysis of the stability limit is presented.

Details

  • Original title: Stability limit of room air temperature of a VAV system.
  • Record ID : 2000-0911
  • 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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