Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/28638
Title: Model-based optimal control of outdoor air flow rate of an air-conditioning system with primary air-handling unit
Authors: Sun, Z
Wang, S 
Zhu, N
Issue Date: 2011
Source: Indoor and built environment, 2011, v. 20, no. 6, p. 626-637
Abstract: This paper presents a model-based outdoor air flow rate optimal control strategy for multi-zone variable air volume air-conditioning systems with the primary air-handling units. An adaptive optimisation algorithm is adopted for optimising the set point of the outdoor air flow rate to minimise the energy cost, which could compromise the energy consumption of the primary fan and the cooling energy saving by the cold outdoor air. The primary fan energy consumption can be predicted using a simplified incremental fan model and the main parameters of this model are identified online. The cooling energy saving by the outdoor air is estimated online using the enthalpies of the air streams. The lower limit of the outdoor air flow rate is determined by a CO2-based adaptive demand-controlled ventilation strategy using the dynamic multi-space equation to maintain the satisfied indoor air quality (IAQ). Tests were conducted to evaluate the performance of the control strategy applied to a practical building system in simulation environment. The results show that the proposed optimal control strategy can reduce energy consumption significantly, while maintaining a satisfactory IAQ.
Keywords: Incremental adaptive model
Model-based control
Optimal control
Primary air-handling unit
VAV air conditioning
Ventilation control
Publisher: SAGE Publications
Journal: Indoor and built environment 
ISSN: 1420-326X
EISSN: 1423-0070
DOI: 10.1177/1420326X11411511
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