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Nonlinear robust control of air handling units to improve the indoor air quality & CO2 concentration: A comparison between H∞ & decoupled sliding mode controls

Setayesh, H ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1016/j.applthermaleng.2019.113958
  3. Publisher: Elsevier Ltd , 2019
  4. Abstract:
  5. Air-handling units (AHUs) are the installations responsible for the control of temperature and humidity inside a space using the heating, cooling, humidifier and drying air components. In this research, a multivariable nonlinear dynamic model of the AHU with one zone in the VAV (variable air volume) system for working in the summer is considered. The indoor temperature, relative humidity and carbon dioxide concentration are controlled via manipulation of the valve positions of the air flow rate, cold water flow rate and fresh air percent. Due to the complexity and nonlinearity of AHU model and also the existence of various operating points and uncertainty, model uncertainties are included. Then, two effective robust control strategies are designed to achieve the less energy consumption and providing the indoor comfort conditions. For this purpose, the indoor temperature, relative humidity and CO2 concentration are controlled in a desirable manner. In this study, linear optimal robust H∞ technique based on the μ̃-DKiteration algorithm is implemented on nonlinear model. Results are compared with the nonlinear decoupled sliding mode control approach. According to the results, for desired tracking objectives in terms of the robust performance specifications, the sliding-mode controller performs better than the linear optimal robust H∞ controller. © 2019 Elsevier Ltd
  6. Keywords:
  7. Air handling unit ; Decoupled sliding mode control ; Multivariate nonlinear model ; Robust H∞ control ; Temperature-humidity-CO2 concentration ; Uncertainty ; Air quality ; Carbon dioxide ; Controllers ; Energy utilization ; Flow of water ; Humidity control ; Indoor air pollution ; Nonlinear systems ; Robust control ; Sliding mode control ; Space heating ; Uncertainty analysis ; Air handling units ; CO2 concentration ; Decoupled sliding mode controls ; Non-linear model ; Robust H
  8. Source: Applied Thermal Engineering ; Volume 160 , 2019 ; 13594311 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S1359431118355297