A comparison between the minimum-order &amp; full-order observers in robust control of the air handling units in the presence of uncertainty

Setayesh, Hassan; Moradi, Hamed; Alasty, Aria

doi:10.1016/j.enbuild.2015.01.016

Cited by 23 publications

(15 citation statements)

References 27 publications

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“…All these effects can be described using the heat balance of the zone. In particular, after ignoring the influence of humidity on temperature (in line with [5] and [6]), the following differential equations describe the evolution of temperature in the system:…”

Section: Problem Formulation and Preliminariesmentioning

confidence: 99%

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Switched Adaptive Control of Air Handling Units With Discrete and Saturated Actuators

Yuan

Zhang

Holub

et al. 2018

IEEE Control Syst. Lett.

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This letter introduces a new switched adaptive control mechanism that can cope with parametric uncertainty while using discrete and saturated actuators. Control of air handling units (AHUs), where air and water supply have discrete and saturated characteristics, is the motivational drive behind this letter. We show that the cheap actuation and low computational requirements of building automation installations can be met after recasting the AHU thermal dynamics as a switched linear system with discrete working modes. Adaptive laws with antiwindup compensation and a switching law based on dwell time are introduced to cope with the uncertainties and input constraints of the switched linear system. Tracking performance is shown analytically and demonstrated via a numerical test case. Index Terms-Air handling units, switched adaptive control, input saturation, discrete input, dwell time. I. INTRODUCTION A T THE core of heating, ventilating and airconditioning (HVAC) systems in modern buildings are air handling units (AHUs), whose task is to provide air at desired temperature and humidity [1]-[3]. Considerable efforts have been made to provide efficient control for AHUs, where at least two intrinsic features of AHUs stand out [4]: first, the interaction between the air circuit and the water circuit in the heating/cooling coil gives rise to nonlinear dynamics; second, custom installation settings and variable operating conditions induce substantial uncertainty and several undetermined operating parameters. As a way to address nonlinearities and uncertainties, intelligent control techniques,

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Section: Problem Formulation and Preliminariesmentioning

confidence: 99%

“…such as fuzzy logic and/or genetic algorithm have been proposed for AHUs [5], [6]. Genetic-based optimal control was adopted in [7] and [8] to maintain the temperature set point.…”

mentioning

confidence: 99%

Switched Adaptive Control of Air Handling Units With Discrete and Saturated Actuators

Yuan

Zhang

Holub

et al. 2018

IEEE Control Syst. Lett.

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“…According to the National Association of Corrosion Engineers (NACE), the global corrosion cost, through direct and indirect losses, was $US 552 billion in 2001, which increased to $US 1.3 trillion in 2009 [7]. Direct and indirect damage to the environment is massive if corrosionrelated problems are overlooked in sensitive oil/gas industries and nuclear power plants.…”

Section: Literature Reviewmentioning

confidence: 99%

Introducing New Coating Material Alloy with Potential Elements for High Corrosion Resistance for Oil and Gas Application

Akhtari-Zavareh¹,

Sarhan²

2016

Advances in Tribology

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In petroleum and petrochemical industries, offshore and onshore systems have to function in an aggressive environment that exposes the production equipment components to thermal cycling and wear and corrosion. Although maintenance of material degradation in oil and gas is costly, internal and external parts of the equipment and pipelines must be well inspected and continually maintained. For this reason, highly advanced corrosion and wear-monitoring systems must be installed in the critical areas of the plant to protect pipes and equipment from seawater and crude oil. Therefore, researchers are in search of advanced materials and methods that could be applied in oil and gas pipelines and accessories for increasing their working time. The common manufacturing processing method for improving the surface of piping and accessories is overlay welding or cladding. This method has some limitations, such as its limitation for choosing materials. In addition, the high temperature of welding causes some defects on the final surface, such as thermal residual stress, cracking, and distortion in the substrate. The method is also time consuming and costly. However, the coating method provides a blend of unique properties with low cost. Thermal spray methods are cold spraying techniques that have a considerably less thermal stress, residual stress, and other defects. Among different thermal spray coating techniques, high-velocity oxygen fuel (HVOF) and plasma are the most commonly used thermal spraying coating processes to produce anti-wear and corrosion coatings with different types of materials such as metal, alloys, and ceramic composite. Furthermore, HVOF and plasma thermally sprayed coating processes induce microstructure heterogeneities, which increase the corrosion and wear resistance. In this research, one type of alloy with chemical composition NiCrCoAlY was chosen for increasing corrosion resistivity of carbon steel piping. A corrosion behavior of coated samples in seawater was investigated for 30 days. Potentiodynamic polarization and electrochemical impedance

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“…Many control strategies have been implemented to improve the dynamic behavior of air conditioners. Model based analysis and simulation of airflow control of AHUs using PI and adaptive self-tuning PI controllers [6], model predictive control [7], optimal control [8,9], feedback linearization control and robust observer of VAV-AHU [10], energy optimization of HVAC system [11], a hybrid MPC optimization [12], improving the robust performance of air-conditioning systems [13], regulation of building temperature via MPC [14], handling of the model uncertainties in buildings via MPC [15], flatness control of a fractional thermal system [16], adaptive and robust control for nonlinear HVAC system [17] and robust path tracking using flatness for fractional linear MIMO thermal system [18] have been presented.…”

Section: Introductionmentioning

confidence: 99%

PID-Fuzzy control of air handling units in the presence of uncertainty

Moradi

Setayesh

Alasty

2016

International Journal of Thermal Sciences

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A comparison between the minimum-order & full-order observers in robust control of the air handling units in the presence of uncertainty

Cited by 23 publications

References 27 publications

Switched Adaptive Control of Air Handling Units With Discrete and Saturated Actuators

Switched Adaptive Control of Air Handling Units With Discrete and Saturated Actuators

Introducing New Coating Material Alloy with Potential Elements for High Corrosion Resistance for Oil and Gas Application

PID-Fuzzy control of air handling units in the presence of uncertainty

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