Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/19559
Title: A novel hybrid steady-state model based controller for simultaneous indoor air temperature and humidity control
Authors: Xu, X
Deng, S 
Han, X
Zhang, X
Keywords: Air conditioning
Control mechanism
Direct expansion
Humidity
Steady state
Variable speed
Issue Date: 2014
Publisher: Elsevier
Source: Energy and buildings, 2014, v. 68, no. parta, p. 593-602 How to cite?
Journal: Energy and buildings 
Abstract: Due to the strong coupling between two control loops, it is always a challenge to develop appropriate control algorithm for simultaneously controlling indoor air temperature and humidity using a direct expansion (DX) air conditioning (A/C) system, making it an engineering application where no expert experience is available. Although the control performance of a steady state model based controller (SSMBC) was normally regarded to be not comparable to that of a dynamic model based controller, the successful development of a SSMBC may provide new insights of the control mechanism. In this paper, a SSMBC was developed based on a previous developed steady state model of a DX A/C system. Its control performance was theoretically analyzed and experimentally tested. It was proven that by utilizing a specific activating method, the SSMBC could achieve much better control performance than that of a traditional On-Off control method. However, the SSMBC could be further improved. Based on the theoretical analysis of the interaction between the changes of system operating states and those of indoor air thermal states, a hybrid SSMBC, which consisted of a SSMBC and a stabilizing controller, was further developed. The accuracy and sensitivity of the novel hybrid SSMBC are experimentally validated.
URI: http://hdl.handle.net/10397/19559
ISSN: 0378-7788
EISSN: 1872-6178
DOI: 10.1016/j.enbuild.2013.09.048
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