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Mathematical Problems in Engineering
Volume 2018, Article ID 6389438, 12 pages
https://doi.org/10.1155/2018/6389438
Research Article

A Hybrid Dynamical Modelling and Control Approach for Energy Saving of Central Air Conditioning

1School of Electric Power, South China University of Technology, Guangzhou, Guangdong, China
2Faculty of Development and Educational Technology Centre, Guangdong University of Finance and Economics, Guangzhou, Guangdong, China

Correspondence should be addressed to Yang Liu; nc.ude.tucs.liam@69y.l

Received 1 February 2018; Revised 7 June 2018; Accepted 14 June 2018; Published 8 July 2018

Academic Editor: Bin Jiang

Copyright © 2018 Yan Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Currently in China, energy conservation and emission reduction are important initiatives for society. Because of its large proportion of building energy consumption, several methods for building energy conservation have been introduced for central air conditioning. This paper presents a hybrid system for a modelling and control approach. By analysing the cooling capacity transfer process and the electromagnetic properties of pumps, the modelling is performed in a hybrid system framework. Pumps are classified as fixed-frequency pumps, variable-frequency pumps, and switchable pumps; a switch control strategy is used in the chilled water system for supplying cooling capacity. In order to adjust indoor temperature and save electrical energy, the cooling capacity allocation and average temperature methods are presented, which satisfy the goal of optimal control of real-time energy consumption. As a numerical example, the temperature variation and cold regulation processes are simulated. Three rooms are the control objects that lower the setting points, and pumps waste as little electrical energy as possible. The results show 49.4% of water pump power consumption when compared with constant water volume technology. The modelling and control approach is more advantageous in ensuring the success of reconstruction projects for central air conditioning.