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Indexed by:
Article
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First Author:
Zhongwei Sun
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Correspondence Author:
Shengwei Wang
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Co-author:
Na Zhu
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Journal:
International Journal of Thermal Science
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Included Journals:
SCI
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Affiliation of Author(s):
The Hong Kong Polytechnic University
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Place of Publication:
United Kingdom
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Discipline:
Engineering
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First-Level Discipline:
Civil Engineering
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Funded by:
Hong Kong Research Grants Council
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Document Type:
J
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Volume:
20
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Page Number:
626-637
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ISSN No.:
1420-326X
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Key Words:
Primary air-handling unit; VAV air conditioning; Ventilation control; Model-based control; Incremental adaptive model; Optimal control
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DOI number:
10.1177/1420326X11411511
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Date of Publication:
2011-12-28
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Impact Factor:
3.067
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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.
