Modeling and Analysis of Chilled Water Systems PDF Download

Author: Shawn Eric Klawunder
Publisher:
ISBN:
Category : Cooling towers
Languages : en
Pages : 310

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Author: Anvay Joshi
Publisher:
ISBN:
Category :
Languages : en
Pages : 120

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Author: William J. Atherton
Publisher:
ISBN:
Category : Large scale systems
Languages : en
Pages : 534

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Author: Jun Liu
Publisher:
ISBN:
Category :
Languages : en
Pages : 125

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ABSTRACT Dynamic Modeling and Gain Scheduling Control of a Chilled Water Cooling System Jun Liu In this thesis, a dynamic model of a chilled water (ChW) cooling system with a stratified ChW tank was developed. The model-based analysis of the energy consumption and the cost under different control strategies were studied. The dynamic model consists of a zone, a cooling coil, a chiller, a stratified ChW tank, and a cooling tower. Nonlinear differential equations were written to describe and evaluate the performance of the entire chiller plant with the ChW tank. A PI-based gain scheduling (GS) control was designed and its performance was compared with the constant gain PI control by subjecting to setpoint changes and load disturbances. The simulation results showed that the system with GS control gives good control and has more stable performance. Five different operation strategies were simulated for comparing the energy consumption and the cost of the ChW cooling system under full load and partial load conditions. The results showed that the operating strategy with optimized chilled water setpoint saved 7.16% energy (21.5% cost) compared to the case with constant setpoint. These savings were more significant (36%) under partial load conditions. The gain scheduling control with optimal setpoint has great potential for energy savings as demonstrated by the results presented in the thesis.

Author: Faye C. McQuiston
Publisher: John Wiley & Sons
ISBN: 0471470155
Category : Technology & Engineering
Languages : en
Pages : 648

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HEATING, VENTILATING, AND AIR CONDITIONING Completely revised with the latest HVAC design practices! Based on the most recent standards from ASHRAE, this Sixth Edition provides complete and up-to-date coverage of all aspects of heating, ventilation, and air conditioning. You’ll find the latest load calculation procedures, indoor air quality procedures, and issues related to ozone depletion. Throughout the text, numerous worked examples clearly show you how to apply the concepts in realistic scenarios. In addition, several computer programs (several new to this edition) help you understand key concepts and allow you to simulate various scenarios, such as psychometrics and air quality, load calculations, piping system design, duct system design, and cooling coil simulation. Additionally, the load calculation program has been revised and updated. These computer programs are available at the book’s website: www.wiley.com/college/mcquiston Key Features of the Sixth Edition Additional new worked examples in the text and on the accompanying software. Chapters 6-9 have been extensively revised for clarity and ease of use. Chapter 8, The Cooling Load, now includes two approaches: the heat balance method, as recommended by ASHRAE, and the simpler RTS method. Both approaches include computer applications to aid in calculations. Provides complete, authoritative treatment of all aspects of HVAC, based on current ASHRAE standards. Numerous worked examples and homework problems provide realistic scenarios to apply concepts.

Author: Hoseyn Sayyaadi
Publisher: Academic Press
ISBN: 0128166576
Category : Technology & Engineering
Languages : en
Pages : 558

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Modelling, Assessment, and Optimization of Energy Systems provides comprehensive methodologies for the thermal modelling of energy systems based on thermodynamic, exergoeconomic and exergoenviromental approaches. It provides advanced analytical approaches, assessment criteria and the methodologies to obtain analytical expressions from the experimental data. The concept of single-objective and multi-objective optimization with application to energy systems is provided, along with decision-making tools for multi-objective problems, multi-criteria problems, for simplifying the optimization of large energy systems, and for exergoeconomic improvement integrated with a simulator EIS method. This book provides a comprehensive methodology for modeling, assessment, improvement of any energy system with guidance, and practical examples that provide detailed insights for energy engineering, mechanical engineering, chemical engineering and researchers in the field of analysis and optimization of energy systems. Offers comprehensive analytical tools for the modeling and simulation of energy systems with applications for decision-making tools Provides methodologies to obtain analytical models of energy systems for experimental data Covers decision-making tools in multi-objective problems

Author: F. Carl Knopf
Publisher: John Wiley & Sons
ISBN: 1118121147
Category : Technology & Engineering
Languages : en
Pages : 798

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Book Description
Energy costs impact the profitability of virtually all industrial processes. Stressing how plants use power, and how that power is actually generated, this book provides a clear and simple way to understand the energy usage in various processes, as well as methods for optimizing these processes using practical hands-on simulations and a unique approach that details solved problems utilizing actual plant data. Invaluable information offers a complete energy-saving approach essential for both the chemical and mechanical engineering curricula, as well as for practicing engineers.

Author: Ye Yao
Publisher: Springer
ISBN: 3662533138
Category : Technology & Engineering
Languages : en
Pages : 496

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Book Description
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.

Author:
Publisher:
ISBN:
Category : High pressure (Science)
Languages : en
Pages : 944

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Author: Angui Li
Publisher: Springer Science & Business Media
ISBN: 3642395813
Category : Technology & Engineering
Languages : en
Pages : 825

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Book Description
Proceedings of the 8th International Symposium on Heating, Ventilation and Air Conditioning is based on the 8th International Symposium of the same name (ISHVAC2013), which took place in Xi’an on October 19-21, 2013. The conference series was initiated at Tsinghua University in 1991 and has since become the premier international HVAC conference initiated in China, playing a significant part in the development of HVAC and indoor environmental research and industry around the world. This international conference provided an exclusive opportunity for policy-makers, designers, researchers, engineers and managers to share their experience. Considering the recent attention on building energy consumption and indoor environments, ISHVAC2013 provided a global platform for discussing recent research on and developments in different aspects of HVAC systems and components, with a focus on building energy consumption, energy efficiency and indoor environments. These categories span a broad range of topics, and the proceedings provide readers with a good general overview of recent advances in different aspects of HVAC systems and related research. As such, they offer a unique resource for further research and a valuable source of information for those interested in the subject. The proceedings are intended for researchers, engineers and graduate students in the fields of Heating, Ventilation and Air Conditioning (HVAC), indoor environments, energy systems, and building information and management. Angui Li works at Xi’an University of Architecture and Technology, Yingxin Zhu works at Tsinghua University and Yuguo Li works at The University of Hong Kong.