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Dynamic performance of an electronic zone air temperature control loop in a typical variable-air-volume air conditioning system.

Author(s) : HUNG C. Y. S., LAM H. N., DUNN A.

Type of article: Article

Summary

Few detailed stability studies have been conducted on a practical or typical VAV zone air temperature control loop. In this study, numerical nonlinear dynamic models were built from validated component models of a commercially available thermostat, damper controller-actuators, terminal unit in a typical branch duct, and a simplified fully-mixed zone model from literature. The simulation models were employed to study the dynamic response of a typical VAV electronic zone air temperature control loop to a step disturbance in the zone cooling load. The thermal storage effect associated with the total zone interior surface area including its contents (e.g. furniture) stabilizes the zone air temperature dynamics. With steady branch-duct inlet static pressure, both pressure-dependent and pressure-independent flow controls provided stable zone air temperature control, with slightly superior performance given by the latter. With large fluctuating branch-duct inlet static pressure, the dynamic performance by pressure-independent flow control is much better than by pressure dependent flow control.

Details

  • Original title: Dynamic performance of an electronic zone air temperature control loop in a typical variable-air-volume air conditioning system.
  • Record ID : 2001-0412
  • Languages: English
  • Source: HVAC&R Research - vol. 5 - n. 4
  • Publication date: 1999/10
  • Document available for consultation in the library of the IIR headquarters only.

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