Dynamic Modeling Of Vapor Compression Cycle Systems

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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.

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.

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.

Dynamic Modeling And Cascaded Control For A Multi Evaporator Supermarket Refrigeration System

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Author : Ankush Gupta
language : en
Publisher:
Release Date : 2013

Dynamic Modeling And Cascaded Control For A Multi Evaporator Supermarket Refrigeration System written by Ankush Gupta and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.

The survey from US Department of Energy showed that about one-third of energy consumption in US is due to air conditioning and refrigeration systems. This significant usage of electricity in the HVAC industry has prompted researchers to develop dynamic models for the HVAC components, which leads to implementation of better control and optimization techniques. In this research, efforts are made to model a multi-evaporator system. A novel dynamic modeling technique is proposed based on moving boundary method, which can be generalized for any number of evaporators in a vapor compression cycle. The models were validated experimentally on a commercial supermarket refrigeration unit. Simulation results showed that the models capture the major dynamics of the system in both the steady state and transient external disturbances. Furthermore the use of MEMS (microelectromechanical) based Silicon Expansion Valves (SEVs) have reportedly shown power savings as compared to the Thermal Expansion Valves (TEVs). Experimental tests were conducted on a supermarket refrigeration unit fitted with the MEMS valves to explain the cause of these potential energy savings. In this study an advanced cascaded control algorithm was also designed to control the MEMS valves. The performance of the cascaded control architecture was compared with the standard Thermal Expansion Valves (TEVs) and a commercially available Microstaq (MS) Superheat Controller (SHC). The results reveal that the significant efficiency gains derived on the SEVs are due to better superheat regulation, tighter superheat control and superior cooling effects in shorter time period which reduces the total run-time of the compressor. It was also observed that the duty cycle was least for the cascaded control algorithm. The reduction in duty cycle indicates early shut-off for the compressor resulting in maximum power savings for the cascaded control, followed by the Microstaq controller and then the Thermal Expansion Valves. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/148111

Parameter Estimation And Dynamic State Observer Design For Vapor Compression Systems

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Author : Travis D. Pruitt
language : en
Publisher:
Release Date : 2019

Parameter Estimation And Dynamic State Observer Design For Vapor Compression Systems written by Travis D. Pruitt and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Air conditioning categories.

"Between cooling our house, our workplace, and keeping our food cold both in home and commercially (among other uses), the vapor compression cycle (VCC) is a common method for removing heat from various environments and it accounts for a significant amount of the energy used throughout the world. Therefore, with an ever-growing demand for more efficient processes and reduced energy consumption, improving the ability to accurately model, predict the performance of, and control VCC systems is beneficial to society as whole. While there is much information available regarding the performance for some of the components found in VCC systems, much of the challenge associated with modelling the VCC lies within the complex behavior of the heat exchangers found within the system. Over the years, lumped parameter models have been developed for the VCC. However, many of these rely on simplified geometry (mainly a bare tube assumption), and neglect to capture the effect of the fins found throughout those heat exchangers. This thesis builds upon approaches used in the past by identifying effective heat transfer coefficients that capture this effect. Using this approach, a 2-ton residential air-conditioning unit was modelled, which was able to predict the heat removed by the VCC system within ±4% error when compared to published performance data from the manufacturer. Furthermore, these coefficients, along with the complete dynamic model, form the basis of a nonlinear state observer which can be used to further the ability to accurately predict and monitor system performance."--Boise State University ScholarWorks.

Steady State And Dynamic Simulation Of Large Thermal Systems

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Author : Scott Thomas Haag
language : en
Publisher:
Release Date : 2005

Steady State And Dynamic Simulation Of Large Thermal Systems written by Scott Thomas Haag and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.

The United States Navy has made a corporate decision to develop all-electric technology for inclusion in all future classes of its warships. In anticipation of this, the Office of Naval Research (ONR) continues to support fundamental and applied research in power and thermal management aboard such ships. Thus, as one avenue of activity, ONR is involved in an on-going process to develop transient modeling and simulation tools that may be used to investigate coupled electrical-thermal management issues for its future all-electric ships. The Navy is interested in dynamic models because many of the thermal loads on future all-electric ships have the potential to be heavily dynamic in nature, e.g., electric weaponry and pulsed sensors. The overarching theme of this thesis is thermal management modeling and simulation for large naval ship systems. The work reported here evaluates and utilizes two simulation tools, one steady-state and one dynamic, that were found suitable for modeling surface ship thermal systems. The current Arleigh Burke class destroyer (DDG-51) was used to baseline this modeling activity. The steady-state modeling tool, Cycle-Tempo, was first used in a demonstration – validation problem of a fuel cell – gas turbine hybrid system. Then, as an element of the mainstream work, Cycle-Tempo was used to model and simulate major portions of the DDG-51 thermal management system. Next, Cycle-Tempo was used, along with fundamental thermal analyses, to evaluate a novel cooling scheme that permits heat rejection directly through the hull and into the sea. The dynamic modeling tool of choice, ProTRAX, is a well established commercial product used principally to simulate thermal components and control aspects of conventional power plants. Operation and use of the ProTRAX simulation system is reviewed and discussed. To support the work reported here, the refrigerant R134a was introduced into ProTRAX and validated against established thermodynamic property representations. Finally, ProTRAX was adapted and used to construct a dynamic model of the Navy’s existing 200-ton, vapor compression refrigeration chiller. The model includes the baseline chiller and associated controls and is exercised against sudden and gradual changes in cooling load

Thermodynamic Analysis For Industrial Refrigeration Systems

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Author : John Gardner
language : en
Publisher: Springer Nature
Release Date : 2022-05-31

Thermodynamic Analysis For Industrial Refrigeration Systems written by John Gardner and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-05-31 with Technology & Engineering categories.

The vapor compression cycle (VCC) underpins the vast majority of refrigeration systems throughout the world. Most undergraduate thermodynamics courses cover the VCC, albeit in a cursory fashion. This book is designed to offer an in-depth look at the analysis, design and operation of large-scale industrial ammonia-based refrigeration systems. An important feature of this work is a treatment of computer-aided analysis using CoolProp, an open source resource for evaluating thermodynamic properties. CoolProp can be incorporated into a large number of common computational platforms including Microsfot Excel, Python, and Matlab, all of which are covered in this book.

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.

Object Oriented Modeling Of Vapor Compression Systems And Components

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Author : Anurag Tandon
language : en
Publisher:
Release Date : 1999

Object Oriented Modeling Of Vapor Compression Systems And Components written by Anurag Tandon and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.