Steady State And Dynamic Simulation Of Large Thermal Systems
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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
Thermal Electrical Co Simulation Of Shipboard Integrated Power Systems On An All Electric Ship
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Author : Matthew Andrew Pruske
language : en
Publisher:
Release Date : 2009
Thermal Electrical Co Simulation Of Shipboard Integrated Power Systems On An All Electric Ship written by Matthew Andrew Pruske 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.
The goal of the work reported herein has been to model aspects of the electrical distribution system of an all-electric ship (AES) and to couple electrical load behavior with the thermal management network aboard the ship. The development of a thermally dependent electrical network has built upon an in-house thermal management simulation environment to replace the existing steady state heat loads with dynamic, thermally dependent, electrical heat loads. Quantifying the close relationship between thermal and electrical systems is of fundamental importance in a large, integrated system like the AES. This in-house thermal management environment, called the Dynamic Thermal Modeling and Simulation (DTMS) framework, provided the fundamental capabilities for modeling thermal systems and subsystems relevant to the AES. The motivation behind the initial work on DTMS was to understand the dynamics of thermal management aboard the ship. The first version, developed in 2007, captured the fundamental aspects of system-level thermal management while maintaining modularity and allowing for further development into other energy domains. The reconfigurable nature of the DTMS framework allowed for the expansion into the electrical domain with the creation of an electrical distribution network in support of thermal simulations. The dynamics of the electrical distribution system of the AES were captured using reconfigurable and physics-based circuit elements that allow for thermal feedback to affect the behavior of the system. Following the creation of the electrical network, subsystems and systems were created to simulate electrical distribution. Then, again using the modularity features of DTMS, a thermal resistive heat flow network was created to capture the transient behavior of heat flow from the electrical network to the existing thermal management framework. This network provides the intimate link between the thermal management framework and the electrical distribution system. Finally, the three frameworks (electrical, thermal resistive, and thermal management) were combined to quantify the impact that each system has relative to system-level operation. Simulations provide an indication of the unlimited configurations and potential design space a user of DTMS can explore to explore the design of an AES.
Electrical Thermal Modeling And Simulation For Three Dimensional Integrated Systems
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Author : Jianyong Xie
language : en
Publisher:
Release Date : 2013
Electrical Thermal Modeling And Simulation For Three Dimensional Integrated Systems written by Jianyong Xie and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Interconnects (Integrated circuit technology) categories.
The continuous miniaturization of electronic systems using the three-dimensional (3D) integration technique has brought in new challenges for the computer-aided design and modeling of 3D integrated circuits (ICs) and systems. The major challenges for the modeling and analysis of 3D integrated systems mainly stem from four aspects: (a) the interaction between the electrical and thermal domains in an integrated system, (b) the increasing modeling complexity arising from 3D systems requires the development of multiscale techniques for the modeling and analysis of DC voltage drop, thermal gradients, and electromagnetic behaviors, (c) efficient modeling of microfluidic cooling, and (d) the demand of performing fast thermal simulation with varying design parameters. Addressing these challenges for the electrical/thermal modeling and analysis of 3D systems necessitates the development of novel numerical modeling methods. This dissertation mainly focuses on developing efficient electrical and thermal numerical modeling and co-simulation methods for 3D integrated systems. The developed numerical methods can be classified into three categories. The first category aims to investigate the interaction between electrical and thermal characteristics for power delivery networks (PDNs) in steady state and the thermal effect on characteristics of through-silicon via (TSV) arrays at high frequencies. The steady-state electrical-thermal interaction for PDNs is addressed by developing a voltage drop-thermal co-simulation method while the thermal effect on TSV characteristics is studied by proposing a thermal-electrical analysis approach for TSV arrays. The second category of numerical methods focuses on developing multiscale modeling approaches for the voltage drop and thermal analysis. A multiscale modeling method based on the finite-element non-conformal domain decomposition technique has been developed for the voltage drop and thermal analysis of 3D systems. The proposed method allows the modeling of a 3D multiscale system using independent mesh grids in sub-domains. As a result, the system unknowns can be greatly reduced. In addition, to improve the simulation efficiency, the cascadic multigrid solving approach has been adopted for the voltage drop-thermal co-simulation with a large number of unknowns. The focus of the last category is to develop fast thermal simulation methods using compact models and model order reduction (MOR). To overcome the computational cost using the computational fluid dynamics simulation, a finite-volume compact thermal model has been developed for the microchannel-based fluidic cooling. This compact thermal model enables the fast thermal simulation of 3D ICs with a large number of microchannels for early-stage design. In addition, a system-level thermal modeling method using domain decomposition and model order reduction is developed for both the steady-state and transient thermal analysis. The proposed approach can efficiently support thermal modeling with varying design parameters without using parameterized MOR techniques.
Design And Optimization Of Thermal Systems Third Edition
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Author : Yogesh Jaluria
language : en
Publisher: CRC Press
Release Date : 2019-09-06
Design And Optimization Of Thermal Systems Third Edition written by Yogesh Jaluria and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-09-06 with Mathematics categories.
Design and Optimization of Thermal Systems, Third Edition: with MATLAB® Applications provides systematic and efficient approaches to the design of thermal systems, which are of interest in a wide range of applications. It presents basic concepts and procedures for conceptual design, problem formulation, modeling, simulation, design evaluation, achieving feasible design, and optimization. Emphasizing modeling and simulation, with experimentation for physical insight and model validation, the third edition covers the areas of material selection, manufacturability, economic aspects, sensitivity, genetic and gradient search methods, knowledge-based design methodology, uncertainty, and other aspects that arise in practical situations. This edition features many new and revised examples and problems from diverse application areas and more extensive coverage of analysis and simulation with MATLAB®.
Tdist A Program For Community Energy Demand Analysis And Total Energy System Response Simulation User S Manual
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Author : John W. Stetkar
language : en
Publisher:
Release Date : 1976
Tdist A Program For Community Energy Demand Analysis And Total Energy System Response Simulation User S Manual written by John W. Stetkar and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with categories.
TDIST, the Thermal Distribution System Simulation Code, is a computer program developed at MIT to aid in the design and dynamic performance analysis of a large integrated Total Energy System (TES) supplying thermal and electrical energy to a multi-consumer-type metropolitan area. Included in this User's Manual are derivations of the detailed consumer energy demand models and of the Thermal Utility System (TUS) component models developed in each of the system analysis subroutines. Comprehensive modelling scenarios are presented to illustrate how these program components are combined to yield a range of steady-state and dynamic system analysis options. Program execution information includes descriptions of the three primary modes of program operation, complete documentation of input requirements and data card formats, examples of available data output options, and a listing of the code. Sample data is included for the execution of a 24-hour dynamic simulation of a TES serving a community of 50,000. (Author).
Development Of A Modular Software System For The Dynamic Simulation Of Coal Conversion Plants
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Author : United States. Department of Energy
language : en
Publisher:
Release Date : 1977
Development Of A Modular Software System For The Dynamic Simulation Of Coal Conversion Plants written by United States. Department of Energy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Coal gasification categories.
Computational Methods For Process Simulation
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Author : W. Fred Ramirez
language : en
Publisher: Butterworth-Heinemann
Release Date : 1997-11-20
Computational Methods For Process Simulation written by W. Fred Ramirez and has been published by Butterworth-Heinemann this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997-11-20 with Science categories.
Process Modelling and simulation have proved to be extremely successful engineering tools for the design and optimisation of physical, chemical and biochemical processes. The use of simulation has expanded rapidly over the last two decades because of the availability of large high-speed computers and indeed has become even more widespread with the rise of the desk-top PC resources now available to nearly every engineer and student. In the chemical industry large, realistic non-linear problems are routinely solved with the aid of computer simulation. This has a number of benefits, including easy assessment of the economic desirability of a project, convenient investigation of the effects of changes to system variables, and finally the introduction of mathematical rigour into the design process and inherent assumptions that may not have been there before. Computational Methods for Process Simulation develops the methods needed for the simulation of real processes to be found in the process industries. It also stresses the engineering fundamentals used in developing process models. Steady state and dynamic systems are considered, for both spatially lumped and spatially distributed problems. It develops analytical and numerical computational techniques for algebraic, ordinary and partial differential equations, and makes use of computer software routines that are widely available. Dedicated software examples are available via the internet. Written for a compulsory course element in the US Includes examples using software used in academia and industry Software available via the Internet
Previews Of Heat And Mass Transfer
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Author :
language : en
Publisher:
Release Date : 1989
Previews Of Heat And Mass Transfer written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Heat categories.
Engineering Economics Of Alternative Energy Sources
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Author : Khalil Denno
language : en
Publisher: CRC Press
Release Date : 2018-01-18
Engineering Economics Of Alternative Energy Sources written by Khalil Denno and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-01-18 with Technology & Engineering categories.
This text book presents a comprehensive picture for the economic aspects, feasibility and adaptability as well as modelling of alternative energy sources and their interconnections. The economic analysis for each mode of energy source is preceded by the introduction of the sources basic structural components and operational as well as fuel characteristics.
Dynamic Model For Small Capacity Ammonia Water Absorption Chiller
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Author : Vinodh Kumar Viswanathan
language : en
Publisher:
Release Date : 2013
Dynamic Model For Small Capacity Ammonia Water Absorption Chiller written by Vinodh Kumar Viswanathan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Air conditioning categories.
Optimization of the performance of absorption systems during transient operations such as start-up and shut-down is particularly important for small-capacity chillers and heat pumps to minimize lifecycle costs. Dynamic models in the literature have been used to study responses to step changes in a single parameter, but more complex processes such as system start-up have not been studied in detail. A robust system-level model for simulating the transient behavior of an absorption chiller is developed here. Individual heat and mass exchangers are modeled using detailed segmental models. The UA-values and thermal masses of heat exchangers used in the model are representative of a practical operational chiller. Thermal masses of the heat exchangers and energy storage in the heat exchanging fluids are accounted for to achieve realistic transient simulation of the heat transfer processes in the chiller. The pressure drop due to fluid flow across the heat exchangers is considered negligible in comparison to the pressure difference between the high- and low-side components (~ 1.5 MPa). In components with significant mass transfer effects, reduced-order models are employed to decrease computational costs while also maintaining accurate system response. Mass and species storage in the cycle are modeled using storage devices. The storage devices account for expansion and contraction of the refrigerant and solution in the cycle as the system goes through start-up, shut-down, and other transient events. A counterflow falling film desorber model is employed to account for the heat and mass transfer interactions between the liquid and vapor phases, inside the desorber. The liquid film flows down counter to the rising vapor, thereby exchanging heat with the counterflowing heated coupling fluid. A segmented model is used to account for these processes, and a solver is developed for performing rapid iteration and quick estimation of unknown vapor and liquid states at the outlet of each segment of the desorber. Other components such as the rectifier, expansion valves and solution pump are modeled as quasi-steady devices. System start-up is simulated from ambient conditions, and the coupling fluid temperatures are assumed to start up to their steady-state values within the first 90 s of simulation. It is observed that the system attains steady-state in approximately 550 s. The evaporator cooling duty and COP of the chiller during steady-state are observed to be 3.41 kW and 0.60, respectively. Steady-state parameters such as flow rates, heat transfer rates and concentrations are found to match closely with results from simulations using corresponding steady-state models. Several control responses are investigated using this dynamic simulation model. System responses to step changes in the desorber coupling fluid temperature and flow rate, solution pumping rate, and valve setting are used to study the effects of several control strategies on system behavior. Results from this analysis can be used to optimize start-up and steady state performances. The model can also be used for devising and testing control strategies in commercial applications.