Modeling of Vapor Compression Cycles for Multivariable Feedback Control of HVAC Systems

He, Xiangdong; Liu, Sheng; Asada, H. Harry

doi:10.1115/1.2801231

Cited by 135 publications

(80 citation statements)

References 11 publications

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“…A somewhat richer literature exists on dynamic modeling and control of vapor compression cycles, the "reverse" of Rankine cycle, for air conditioning systems (see, for instance, [16] and the numerous papers of the Alleyne Research Group [17], [18], [19]). More particularly, in [18], a solid approach is presented for both modeling, with the use of simplified (movingboundary) heat exchanger models, and control design, with the development of control systems of increasing complexity (from decentralized PI-based control to multivariable H ∞ synthesis) to improve performance.…”

Section: State Of the Artmentioning

confidence: 99%

Supervision and control prototyping for an engine exhaust gas heat recovery system based on a steam Rankine cycle

Tona

Peralez

Sciarretta

2012

2012 IEEE/ASME International Conference on Advanced Intelligent Mechatronics (AIM)

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Abstract-Rankine-cycle waste heat recovery systems for automotive applications have been the focus of intensive research in recent years, as they seem to offer considerable potential for fuel consumption reduction. Because of the highly transient conditions they are subject to, control plays a fundamental role to enable viability and efficiency of those systems. Yet, surprising little research has been devoted to this topic. This paper illustrates the design of a practical supervision and control system for a pilot Rankine steam process for exhaust gas heat recovery from a spark-ignition engine. The proposed control strategy for power production focuses more on ensuring continuity of operation than on the pursuit of optimality. The resulting decentralized control system is implemented via two anti-wind up controllers with feedforward action.Performance has been assessed in simulation on a motorway driving cycle using real engine exhaust data. Despite very transient exhaust gas conditions, we show that the expander can produce power throughout the cycle, avoiding start-stop procedures, which would greatly reduce the global efficiency.

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Section: State Of the Artmentioning

confidence: 99%

Supervision and control prototyping for an engine exhaust gas heat recovery system based on a steam Rankine cycle

Tona

Peralez

Sciarretta

2012

2012 IEEE/ASME International Conference on Advanced Intelligent Mechatronics (AIM)

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“…A somewhat richer literature is available on dynamic modelling and control of vapor compression cycles, the "reverse" of Rankine cycles ( [10], [11], [12]). …”

Section: State Of the Artmentioning

confidence: 99%

Improving the control performance of an Organic Rankine Cycle system for waste heat recovery from a heavy-duty diesel engine using a model-based approach

Peralez

Tona

Lepreux

et al. 2013

52nd IEEE Conference on Decision and Control

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Abstract-In recent years, waste heat recovery (WHR) systems based on Rankine cycles have been the focus of intensive research for transport applications, as they seem to offer considerable potential for fuel consumption reduction. Because of the highly transient conditions they are subject to, control plays a fundamental role to enable viability and efficiency of those systems.The system considered here is an Organic Rankine Cycle (ORC) for recovering waste heat from a heavyduty diesel engine. For this system, a hierarchical and modular control structure has been designed, implemented and validated experimentally on an engine testbed cell.The paper focuses more particularly on improving the baseline control strategy using a model-based approach. The improvements come from an extensive system identification campaign allowing model-based tuning of PID controllers and, more particularly, from a dynamic feedforward term computed from a nonlinear reduced model of the high-pressure part of the system.Experimental results illustrate the enhanced performance in terms of disturbance rejection.

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“…The one-dimensional partial differential equations of the refrigerant flowing through the heat exchanger is as follows [1] [4] .…”

Section: Modelmentioning

confidence: 99%

“…Through the dynamic adjustment of these state variables can not only achieve the purpose of energy conservation, but also extend the service life of equipment [1] . Among them, in the air-conditioning and refrigeration control system, the compressor speed control and evaporator superheat degree control are the most basic and most important link.…”

Section: Introductionmentioning

confidence: 99%

Switching Optimal Controller For Evaporation Temperature And Superheat Of Air-Conditioning Cooling System

Zheng¹,

Li²,

Wang³

2017

Proceedings of the 2017 2nd Joint International Information Technology, Mechanical and Electronic Engineering Conference (JIMEC

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In this paper, a 2 input-2 output dynamic lumped parameter model of the refrigeration cycle is established for residential air-conditioning equipment. Based on the nonlinear characteristics of the refrigeration system and the idea of switching control, the system model is linearized at some selected stable operating points, and respectively a set of linear system models are obtained. By using the linear quadratic optimal control, the optimal state feedback controller is designed for each sub-model, and then the switching controller is designed. The simulation results show the effectiveness of the designed controller. IntroductionIn the air-conditioning control system, the control of both evaporation temperature and superheat degree is an important part. The rapid and stable control of the evaporating temperature and superheat degree is also the key to realize the high efficiency and energy saving operation.Theoretically, the vapor compression cycle can be described by the amount of evaporation temperature, condensation temperature, superheat degree at the outlet of the evaporator, and subcooling degree at the outlet of the condenser. Through the dynamic adjustment of these state variables can not only achieve the purpose of energy conservation, but also extend the service life of equipment [1] . Among them, in the air-conditioning and refrigeration control system, the compressor speed control and evaporator superheat degree control are the most basic and most important link. In the control of variable speed compressor and electronic expansion valve, the traditional single-input single-output control system can not describe this control system well because the refrigeration system has many control components and strong coupling between parameters. Therefore, in order to achieve better control effect, multi-input multi-output control system must be referenced [2] .In this paper, firstly, the mechanism model of air conditioning refrigeration system is deduced according to the law of conservation of mass, energy and momentum in physics. Then, the non-linear model obtained after modeling the mechanism is linearized at multiple stable operating points, and a set of linearized models are obtained. Finally, the corresponding optimal state feedback controller is designed for each sub-model, and then the switching rules are designed to realize the switching control [3] . ModelThe schematic diagram of the vapor compression cycle system for residential air-conditioning with six state variables is shown in Figure 1. Based on the laws of conservation of mass, energy and momentum, under the assumption conditions: 1) The heat exchanger is a long, thin, horizontal tube.2) The refrigerant flowing through the heat exchanger tube is in one dimension.3) The axial heat transfer of the heat exchanger is neglected. The one-dimensional partial differential equations of the refrigerant flowing through the heat exchanger is as follows [1][4] .Where  :density, u : velocity,  : friction coefficient, P : pressure, i D : inner di...

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Modeling of Vapor Compression Cycles for Multivariable Feedback Control of HVAC Systems

Cited by 135 publications

References 11 publications

Supervision and control prototyping for an engine exhaust gas heat recovery system based on a steam Rankine cycle

Supervision and control prototyping for an engine exhaust gas heat recovery system based on a steam Rankine cycle

Improving the control performance of an Organic Rankine Cycle system for waste heat recovery from a heavy-duty diesel engine using a model-based approach

Switching Optimal Controller For Evaporation Temperature And Superheat Of Air-Conditioning Cooling System

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