Dynamic Modeling And Multivariable Control Of Vapor Compression Cycles In Air Conditioning Systems
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Dynamic Modeling And Multivariable Control Of Vapor Compression Cycles In Air Conditioning Systems
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Author : Xiang-Dong He
language : en
Publisher:
Release Date : 1996
Dynamic Modeling And Multivariable Control Of Vapor Compression Cycles In Air Conditioning Systems written by Xiang-Dong He and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.
Dynamic Modeling Of Vapor Compression Cycle Systems
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Author : Eric S. Miller
language : en
Publisher:
Release Date : 2012
Dynamic Modeling Of Vapor Compression Cycle Systems written by Eric S. Miller and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Vapor compression cycles (VCS) based thermal management systems are being considered in modern aircraft where dynamic changes in heat loads are very common. Predicting dynamic behavior of vapor compression systems is critical to design, sizing, and control of aircraft thermal management systems. A novel Lagrangian method to model the dynamic behavior of vapor compression cycles is presented in this thesis. Fluid flowing through a vapor compression cycle is divided into a large number of material volumes (or mass elements). The mass contained in each element is fixed while the size of the material volume is allowed to change based on its density. At every time step, heat transfer to each mass element is determined and corresponding changes in the thermodynamic properties are evaluated. Each mass element is tracked as it moves through the evaporator, the compressor, the condenser, the expansion valve, and the piping connecting these components. This approach improves on previous models by accounting for spatial mass and enthalpy distribution, meaning that transport delays are reflected in the model result. The model predicts the transient variation during normal operation as well as start-up and shut-down modes. Model results were compared to experimental data at steady state. The model was then validated by comparing the predicted system behavior with experimental data. Results are presented and explained for three major operating condition variations : change in heat load, change in sink availability, and changes in system throttling via the expansion valve and compressor. The results depict extensive coupling of system parameters and significant response to exogenous inputs. The resulting model is modular, adaptable and runs cases faster than real time. Many opportunities exist for its utilization.
Encyclopedia Of Two Phase Heat Transfer And Flow Iii Macro And Micro Flow Boiling And Numerical Modeling Fundamentals A 4 Volume Set
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Author : Thome John R
language : en
Publisher: World Scientific
Release Date : 2018-03-13
Encyclopedia Of Two Phase Heat Transfer And Flow Iii Macro And Micro Flow Boiling And Numerical Modeling Fundamentals A 4 Volume Set written by Thome John R and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-03-13 with Technology & Engineering categories.
Set III of this encyclopedia is a new addition to the previous Sets I and II. It contains 26 invited chapters from international specialists on the topics of numerical modeling of two-phase flows and evaporation, fundamentals of evaporation and condensation in microchannels and macrochannels, development and testing of micro two-phase cooling systems for electronics, and various special topics (surface wetting effects, microfin tubes, two-phase flow vibration across tube bundles). The chapters are written both by renowned university researchers and by well-known engineers from leading corporate research laboratories. Numerous 'must read' chapters cover the fundamentals of research and engineering practice on boiling, condensation and two-phase flows, two-phase heat transfer equipment, electronics cooling systems, case studies and so forth. Set III constitutes a 'must have' reference together with Sets I and II for thermal engineering researchers and practitioners.
Dynamic Modeling And Control Of Vapor Compression Cycle Systems With Shut Down And Start Up Operations
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Author : Bin Li
language : en
Publisher:
Release Date : 2009
Dynamic Modeling And Control Of Vapor Compression Cycle Systems With Shut Down And Start Up Operations written by Bin Li and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Modeling And Control In Air Conditioning Systems
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Author : Ye Yao
language : en
Publisher: Springer
Release Date : 2016-10-01
Modeling And Control In Air Conditioning Systems written by Ye Yao and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-10-01 with Technology & Engineering categories.
This book investigates the latest modeling and control technologies in the context of air-conditioning systems. Firstly, it introduces the state-space method for developing dynamic models of all components in a central air-conditioning system. The models are primarily nonlinear and based on the fundamental principle of energy and mass conservation, and are transformed into state-space form through linearization. The book goes on to describe and discuss the state-space models with the help of graph theory and the structure-matrix theory. Subsequently, virtual sensor calibration and virtual sensing methods (which are very useful for real system control) are illustrated together with a case study. Model-based predictive control and state-space feedback control are applied to air-conditioning systems to yield better local control, while the air-side synergic control scheme and a global optimization strategy based on the decomposition-coordination method are developed so as to achieve energy conservation in the central air-conditioning system. Lastly, control strategies for VAV systems including total air volume control and trim & response static pressure control are investigated in practice.
Automotive Air Conditioning
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Author : Quansheng Zhang
language : en
Publisher: Springer
Release Date : 2016-08-10
Automotive Air Conditioning written by Quansheng Zhang and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-08-10 with Technology & Engineering categories.
This book presents research advances in automotive AC systems using an interdisciplinary approach combining both thermal science, and automotive engineering. It covers a variety of topics, such as: control strategies, optimization algorithms, and diagnosis schemes developed for when automotive air condition systems interact with powertrain dynamics. In contrast to the rapid advances in the fields of building HVAC and automotive separately, an interdisciplinary examination of both areas has long been neglected. The content presented in this book not only reveals opportunities when interaction between on-board HVAC and powertrain is considered, but also provides new findings to achieve performance improvement using model-based methodologies.
The Control Handbook Three Volume Set
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Author : William S. Levine
language : en
Publisher: CRC Press
Release Date : 2018-10-08
The Control Handbook Three Volume Set written by William S. Levine and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-10-08 with Technology & Engineering categories.
At publication, The Control Handbook immediately became the definitive resource that engineers working with modern control systems required. Among its many accolades, that first edition was cited by the AAP as the Best Engineering Handbook of 1996. Now, 15 years later, William Levine has once again compiled the most comprehensive and authoritative resource on control engineering. He has fully reorganized the text to reflect the technical advances achieved since the last edition and has expanded its contents to include the multidisciplinary perspective that is making control engineering a critical component in so many fields. Now expanded from one to three volumes, The Control Handbook, Second Edition brilliantly organizes cutting-edge contributions from more than 200 leading experts representing every corner of the globe. They cover everything from basic closed-loop systems to multi-agent adaptive systems and from the control of electric motors to the control of complex networks. Progressively organized, the three volume set includes: Control System Fundamentals Control System Applications Control System Advanced Methods Any practicing engineer, student, or researcher working in fields as diverse as electronics, aeronautics, or biomedicine will find this handbook to be a time-saving resource filled with invaluable formulas, models, methods, and innovative thinking. In fact, any physicist, biologist, mathematician, or researcher in any number of fields developing or improving products and systems will find the answers and ideas they need. As with the first edition, the new edition not only stands as a record of accomplishment in control engineering but provides researchers with the means to make further advances.
Gray Box Dynamic Modeling Of Vapor Compression Systems For Control Optimization
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Author : Haopeng Liu
language : en
Publisher:
Release Date : 2022
Gray Box Dynamic Modeling Of Vapor Compression Systems For Control Optimization written by Haopeng Liu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with Air conditioning categories.
Dynamic Modeling Validation And Control For Vapor Compression Systems
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Author :
language : en
Publisher:
Release Date : 2015
Dynamic Modeling Validation And Control For Vapor Compression Systems written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Optimization Of Air Conditioning Cycling
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Author : Swarooph Nirmal Seshadri
language : en
Publisher:
Release Date : 2012
Optimization Of Air Conditioning Cycling written by Swarooph Nirmal Seshadri and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Systems based on the vapor compression cycle are the most widely used in a variety of air conditioning applications. Despite the vast growth of modern control systems in the field of air conditioning systems, industry standard control is still thermostat based on-off control, in other words cycle control. This thesis proposes an approach to find the optimal profiles for the expansion valve and the evaporator fan for an air conditioning system for a given period of on-off cycle of the compressor. The research will consist of two phases, the development of a simulation model and an experimental analysis. In this thesis, the profiles for the expansion valve and the evaporator fan are parameterized by an S-curve equation so that the optimization problem will have less numbers of parameters. The first step is a simulation model that predicts startup/shutdown characteristics. This model is used as a tool to understand the effect that the S-curve parameters has on the system cycle efficiency. Several key vapor compression system dynamics are identified as causes for increasing/decreasing system's cyclic efficiency. Refrigerant migration and fan delay at shutdown are determined as crucial issues that have an effect on the A direct search optimization algorithm, namely the simplex search algorithm, is then used to search for the optimal S-curve parameters. Valve/fan strategies that ultimately resulted in a better superheat control are assessed as the most energy efficient. Extensive experimental tests conducted on a 3-ton residential air conditioner are then presented to intuitively understand the effect of expansion valve and evaporator fan cycling in a real system. A real time optimization method is explored and the feasibility, recommendations for a successful online method are proposed. The heuristics for the expansion valve and evaporator fan profiles from the optimization results could be easily hard coded into any commercial air conditioning system to perform the much preferred cycle control. Thus a significant improvement in the energy performance was observed without the use of any advanced control techniques.