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Application And Design Of Air To Air Variable Refrigerant Flow Systems
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Book Synopsis Application and Design of Air-to-air Variable Refrigerant Flow Systems by : Paul Wicoff
Download or read book Application and Design of Air-to-air Variable Refrigerant Flow Systems written by Paul Wicoff and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This report addresses the operation, use, and design of air-to-air variable refrigerant flow systems, also known as VRF. Relatively new to the United States, these HVAC systems have potential to reduce energy consumption and utility costs in the correct applications. Although useful in many applications, the best building types for VRF are those requiring a large number of zones and with low ventilation air requirements. The report explains design and system selection considerations and accordingly presents two flowcharts to help designers implement this system. To show how the system compares to traditional technologies in terms of efficiency and cost, the report presents results from several studies comparing VRF to other systems. In addition, an energy modeling study is conducted to clarify the effect of climate on the system; this study established air-to-air VRF as having highest energy consumption in dry, southern climates, based on energy use and operating costs. With this report, HVAC designers can learn when air-to-air VRF is an acceptable method for providing heating and cooling in a building.
Book Synopsis HVAC - Variable Refrigerant Flow (VRF) Systems by : A. Bhatia
Download or read book HVAC - Variable Refrigerant Flow (VRF) Systems written by A. Bhatia and published by CreateSpace. This book was released on 2014-12-06 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: VRF (Variable refrigerant flow) is an air-condition system configuration where there is one outdoor condensing unit and multiple indoor units. The term variable refrigerant flow (VRF) refers to the ability of the system to control the amount of refrigerant flowing to the multiple evaporators (indoor units), enabling the use of many evaporators of differing capacities and configurations connected to single condensing unit. The arrangement provides an individualized comfort control, and simultaneous heating and cooling in different zones. Currently widely applied in large buildings especially in Japan and Europe, these systems are just starting to be introduced in the U.S. The VRF technology/system was developed and designed by Daikin Industries, Japan who named and protected the term variable refrigerant volume (VRV) system so other manufacturers use the term VRF "variable refrigerant flow". In essence both are same. With a higher efficiency and increased controllability, the VRF system can help achieve a sustainable design. Unfortunately, the design of VRF systems is more complicated and requires additional work compared to designing a conventional direct expansion (DX) system. This 3 -hour quick book provides an overview of VRF system technology. Emphasis is placed on the control principles, terminology, basic components, advantages and design limitations. This course is aimed at the personnel who have some limited background in the air conditioning field and is suitable for mechanical, electrical, controls and HVAC engineers, architects, building designers, contractors, estimators, energy auditors and facility managers.The course includes a multiple-choice quiz consisting of fifteen (15) questions at the end. Learning ObjectiveAt the conclusion of this course, the reader will: * Understand the difference between multi-split air conditioning system and VRF systems;* Understand the operating principle of direct expansion split and VRF system;* Understand the concept of thermal zone;* Understand how VRF with heat recovery are different from ordinary heat pump systems;* Understand the operation of thermostatic expansion valve (TXV) and electronic expansion valve (EEV);* Understand the influence of building characteristics and load profile on selection of VRF system;* Learn the advantages and application of VRF systems;* Understand the design limitations and challenges in design of VRF systems.
Book Synopsis Variable Refrigerant Flow Systems by : Napoleon Enteria
Download or read book Variable Refrigerant Flow Systems written by Napoleon Enteria and published by Springer Nature. This book was released on 2023-01-31 with total page 251 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book compiles the latest research, development, and application of VRF systems with contributions from various experts who pioneered and contributed to the development of the VRF system. This book presents the fundamental issues related to the real application and behaviour of the VRF system based on the long-term monitoring of the installed system. With our experience of pandemic which COVID-19 is an airborne, the spread of the virus is very fast. With this, the heating, ventilating and air-conditioning (HVAC) system is a major player in the maintenance and control of indoor environment to minimize the spread of the virus. As the variable refrigerant flow (VRF) system is a versatile HVAC system in which it can operate at different conditions, the application of the VRF system is very important to control the indoor environmental conditions. Thus, the publication of this book is important with the present situation and the future possible situation which the control of indoor spaces is very important. With this, this book will serve as a reference for building designer, contractors, building regulators and students.
Book Synopsis Guide to variable refrigerant flow (VRF) air conditioning by : D. et al Arnold
Download or read book Guide to variable refrigerant flow (VRF) air conditioning written by D. et al Arnold and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides guidance relevant to those with a role in system design, installation and operation, covering how variable refrigerant flow (VRF) systems work and how they can be designed so that they operate in a highly efficient way.
Book Synopsis Refrigeration, Air Conditioning and Heat Pumps by : G F Hundy
Download or read book Refrigeration, Air Conditioning and Heat Pumps written by G F Hundy and published by Butterworth-Heinemann. This book was released on 2016-03-07 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: Refrigeration, Air Conditioning and Heat Pumps, Fifth Edition, provides a comprehensive introduction to the principles and practice of refrigeration. Clear and comprehensive, it is suitable for both trainee and professional HVAC engineers, with a straightforward approach that also helps inexperienced readers gain a comprehensive introduction to the fundamentals of the technology. With its concise style and broad scope, the book covers most of the equipment and applications professionals will encounter. The simplicity of the descriptions helps users understand, specify, commission, use, and maintain these systems. It is a must-have text for anyone who needs thorough, foundational information on refrigeration and air conditioning, but without textbook pedagogy. It includes detailed technicalities or product-specific information. New material to this edition includes the latest developments in refrigerants and lubricants, together with updated information on compressors, heat exchangers, liquid chillers, electronic expansion valves, controls, and cold storage. In addition, efficiency, environmental impact, split systems, retail refrigeration (supermarket systems and cold rooms), industrial systems, fans, air infiltration, and noise are also included. Full theoretical and practical treatment of current issues and trends in refrigeration and air conditioning technology Meets the needs of industry practitioners and system designers who need a rigorous, but accessible reference to the latest developments in refrigeration and AC that is supported by coverage at a level not found in typical course textbooks New edition features updated content on refrigerants, microchannel technology, noise, condensers, data centers, and electronic control
Book Synopsis Dynamic Modeling and Controls of Variable Refrigerant Flow Systems by : Liujia Dong
Download or read book Dynamic Modeling and Controls of Variable Refrigerant Flow Systems written by Liujia Dong and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Building heating ventilation and air conditioning (HVAC) systems have significant impact on the energy consumption of residential and commercial buildings. The Variable Refrigerant Flow (VRF) systems, by distributing refrigerant instead of air flow, have emerged as an appealing class of HVAC system that features quieter operation, higher flexibility, and lower cost of installation and maintenance. However, such systems also present higher challenges for controls that can realize its achievable performance. This dissertation research proposes to investigate the dynamic simulation modeling and modelfree control strategies for energy efficient operation of VRF systems with single or multiple outdoor units (ODUs) under fluctuating and uncertain load and ambient conditions. Modelica based dynamic simulation models are developed for VRF systems of different configurations, which involve modeling of indoor units (IDUs), ODUs, and various control valves for thermal regulation. Motivated by a preliminary study on applying multi-variable extremum seeking control (ESC) for an air-source heat pump (ASHP) system, a model-free self-optimizing control strategy is investigated for efficient operation of a multi-functional VRF system under both heat pump modes and heat recovery modes. With the feedback of the total power only, the multi-variable ESC takes different combinations of manipulated inputs, including IDU superheat setpoints, compressor pressure setpoints, ODU fan speed, and ODU superheat setpoint. Input selection is carried out based on their respective impact on the total power. To realize automatic and smooth switching between different operation modes of multi-functional VRF system, the mode switching strategy is proposed. Whether to turn on or off an IDU is determined by the zone temperature and a preset hysteresis band about the temperature setpoint. Based on the thermodynamic analysis, a decision variable for determining the mode of ODU heat exchanger (HX) is proposed as the ODU-HX air-side temperature differential normalized by the dimensionless outdoor unit fan speed. For the smooth switching between two compressor pressure controllers, two bumpless transfer methods are applied. The simulation results validate the effectiveness of the proposed strategy and performance of bumpless transfer strategies. For the multi-ODU VRF systems, an integrated efficiency operation strategy is proposed to optimize the energy efficiency, which consists of three respects: i) for a given operating condition, a multi-variable ESC strategy is used to optimize the settings of manipulated inputs of operating ODUs, by use of a load-sharing valve array and feedback of the normalized total power; ii) a model-free ODU compressor staging strategy with ESC integrated control logic; and iii) a modelfree ODU heat exchanger mode switching strategy with ESC integrated control logic. For staging on additional ODU compressor, the saturated operation of compressor speed (i.e. saturated to the higher limit) is used as the indicating variable. With ESC-alike real-time optimization strategy in operation, the least efficient compressor would be driven, which will then be staged off. As for automatic mode switch of ODU heat exchangers during heat recovery operation, the saturation of IDU EEV opening is utilized as the indicating variable, and the ODU heat exchanger (or fan-coil unit) with least efficiency under ESC operation will switch its operational mode. Similar to many other HVAC systems, the ESC operation of VRF systems is subject to state and/or input constraints. In this dissertation research, the general problem of constrained ESC is studied. The penalty-functions based framework of constrained ESC is studied. The dither-demodulation design is modified for penalty-function based ESC with assumption of Wiener-Hammerstein system composition. An online penalty-weight adaptation scheme is proposed with online Hessian estimation, and its convergence analysis is conducted in the context of numerical optimization ESC (NOESC).
Book Synopsis Analysis and Design of Heating, Ventilating, and Air-Conditioning Systems, Second Edition by : Herbert W. Stanford III
Download or read book Analysis and Design of Heating, Ventilating, and Air-Conditioning Systems, Second Edition written by Herbert W. Stanford III and published by CRC Press. This book was released on 2019-04-01 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Analysis and Design of Heating, Ventilating, and Air-Conditioning Systems, Second Edition, provides a thorough and modern overview of HVAC for commercial and industrial buildings, emphasizing energy efficiency. This text combines coverage of heating and air conditioning systems design with detailed information on the latest controls technologies. It also addresses the art of HVAC design along with carefully explained scientific and technical content, reflecting the extensive experience of the authors. Modern HVAC topics are addressed, including sustainability, IAQ, water treatment and risk management, vibration and noise mitigation, and maintainability from a practical point of view.
Book Synopsis Variable Air Volume Systems by : Leo A. Meyer
Download or read book Variable Air Volume Systems written by Leo A. Meyer and published by HVAC Books—Best on the Web. This book was released on 1998 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Handbook of Air Conditioning and Refrigeration by : Shan K. Wang
Download or read book Handbook of Air Conditioning and Refrigeration written by Shan K. Wang and published by McGraw Hill Professional. This book was released on 2000-11-07 with total page 1430 pages. Available in PDF, EPUB and Kindle. Book excerpt: * A broad range of disciplines--energy conservation and air quality issues, construction and design, and the manufacture of temperature-sensitive products and materials--is covered in this comprehensive handbook * Provide essential, up-to-date HVAC data, codes, standards, and guidelines, all conveniently located in one volume * A definitive reference source on the design, selection and operation of A/C and refrigeration systems
Book Synopsis HVAC - Chilled Water vs DX System by : Charles Nehme
Download or read book HVAC - Chilled Water vs DX System written by Charles Nehme and published by Charles Nehme. This book was released on with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt: Purpose of the Book The heating, ventilation, and air conditioning (HVAC) industry plays a crucial role in ensuring the comfort, productivity, and well-being of building occupants. Among the myriad of HVAC systems available, chilled water and direct expansion (DX) systems stand out as the two primary choices for large-scale cooling needs. This book aims to provide a comprehensive comparison of these two systems, exploring their components, operational principles, advantages, and disadvantages. By doing so, it seeks to equip engineers, architects, facility managers, and decision-makers with the knowledge necessary to select the most appropriate cooling solution for their specific needs. Scope and Structure This book is structured to offer a detailed examination of chilled water and DX systems, starting from fundamental concepts to in-depth analysis and case studies. The content is organized into ten chapters, each focusing on a specific aspect of these HVAC systems: Fundamentals of HVAC Systems: An introduction to HVAC systems, their importance, and an overview of different types. Chilled Water Systems: Detailed exploration of chilled water systems, including components, design, advantages, and disadvantages. Direct Expansion (DX) Systems: Comprehensive coverage of DX systems, their components, design, advantages, and disadvantages. Energy Efficiency and Performance: Comparison of energy consumption, performance metrics, and efficiency between the two systems. Cost Analysis: Evaluation of initial, operational, and lifecycle costs of chilled water and DX systems. Environmental Impact: Discussion on refrigerants, emissions, sustainability, and future trends in HVAC technology. Application Scenarios: Analysis of how each system performs in different types of buildings and special applications. Design and Implementation: Best practices for system selection, design, installation, commissioning, and maintenance. Case Studies: Real-world examples and lessons learned from successful implementations. Future of HVAC Systems: Exploration of technological advancements, emerging trends, and the future outlook of the HVAC industry. Overview of HVAC Systems HVAC systems are integral to modern buildings, providing thermal comfort and maintaining indoor air quality. These systems regulate temperature, humidity, and air circulation, ensuring that indoor environments remain conducive to the occupants' activities. The choice of an HVAC system can significantly impact energy consumption, operational costs, and environmental footprint, making it a critical decision in the design and management of buildings. Importance of Choosing the Right System Selecting the appropriate HVAC system involves balancing multiple factors such as building size, usage patterns, climate conditions, budget constraints, and energy efficiency goals. Chilled water and DX systems each offer unique benefits and challenges, and their suitability can vary widely depending on the specific application. Understanding the strengths and limitations of each system is essential for making informed decisions that align with both short-term needs and long-term objectives. Goals of the Book The primary goals of this book are to: Provide a clear and detailed comparison of chilled water and DX systems. Highlight the key factors influencing system selection and performance. Present practical insights and real-world examples to guide decision-making. Explore future trends and innovations in the HVAC industry. By achieving these goals, the book aims to be a valuable resource for professionals involved in the design, implementation, and management of HVAC systems, ultimately contributing to more efficient, sustainable, and cost-effective building solutions.
Book Synopsis Design Professional's Guide to Zero Net Energy Buildings by : Charles Eley
Download or read book Design Professional's Guide to Zero Net Energy Buildings written by Charles Eley and published by Island Press. This book was released on 2016-11-15 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the Design Professional's Guide to Zero Net Energy Buildings, Charles Eley draws from over 40 years of his own experience, and interviews with other industry experts, to lay out the principles for achieving zero net energy (ZNE) buildings, which produce as much energy as they use over the course of a year. Eley emphasizes the importance of building energy use in achieving a sustainable future; describes how building energy use can be minimized through smart design and energy efficiency technologies; and presents practical information on how to incorporate renewable energy technologies to meet the lowered energy needs. The book shows the reader through examples and explanations that these solutions are viable and cost effective.
Book Synopsis Air Conditioning System Design by : Roger Legg
Download or read book Air Conditioning System Design written by Roger Legg and published by Butterworth-Heinemann. This book was released on 2017-06-15 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: Air Conditioning System Design summarizes essential theory and then explains how the latest air conditioning technology operates. Load calculations, energy efficiency, and selection of technology are all explained in the context of air conditioning as a system, helping the reader fully consider the implications of design decisions. Whether users need to figure out how to apply their mechanical engineering degree to an air conditioning design task or simply want to find out more about air conditioning technology for a research project, this book provides a perfect guide. Approaches air conditioning as a system, not just a collection of machines Covers the essential theory on fluid flow and the latest in A/C technology in a very readable and easy-to-use style Explains the significance of factors, such as climate and thermal comfort as A/C design considerations Addresses design using a range of air conditioning technologies, such as evaporative cooling, VRF systems, psychromatic software, and dessicant dehumidification
Book Synopsis Variable Refrigerant Flow (VRF) Air Conditioning System by : Lip Wai Tan
Download or read book Variable Refrigerant Flow (VRF) Air Conditioning System written by Lip Wai Tan and published by . This book was released on 2008 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Variable Refrigerant Flow (VRF) Air Conditioning System by : Jamil Lahani
Download or read book Variable Refrigerant Flow (VRF) Air Conditioning System written by Jamil Lahani and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Air Conditioning Application and Design by : W.P. Jones
Download or read book Air Conditioning Application and Design written by W.P. Jones and published by Routledge. This book was released on 2012-11-12 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: Intended for advanced students of building services, this practical book describes the design of air conditioning systems. Readers are assumed to have a knowledge of the basic principles of air conditioning, which are covered in the companion volume Air Conditioning Engineering. This new edition takes account of the latest building codes and pays greater attention to energy conservation. The section on systems characteristics is expanded and extensively revised to take account of developments in the technology of air conditioning since publication of the previous edition. There are expanded sections on specialist applications such as systems for clean rooms in the semiconductor industry. The author has wide experience both in lecturing on the subject and in the practical design and installation of air conditioning systems.
Download or read book 2016 Ashrae Handbook written by and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 2016 ASHRAE Handbook-HVAC Systems and Equipment discusses various systems and the equipment (components or assemblies) they comprise, and describes features and differences.This information helps system designers and operators in selecting and using equipment. ASHRAE Technical Committees in each subject area have reviewed all chapters and revised them as needed for current technology and practice. An accompanying CD-ROM contains all the volumes and chapters in both I-P and SI units.
Book Synopsis Net Zero Energy Design by : Thomas Hootman
Download or read book Net Zero Energy Design written by Thomas Hootman and published by John Wiley & Sons. This book was released on 2012-10-15 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: Conveniently organized and packed with robust technical content and clear explanations of key principles Written by an architect who is the director of sustainability at a global architecture firm, Net Zero Energy Design is a practical guide for architects and related construction professionals who want to design and build net zero energy commercial architecture. It offers no-nonsense strategies, step-by-step technical analysis, and valuable examples, in addition to developed case studies. With a focus on application in a variety of building types and scales, the book also develops a broad-based understanding of all the integrated principles involved in achieving net zero energy. This book is an indispensable resource for anyone venturing into net zero energy design, construction, and operation, and it also serves as an excellent resource on a variety of sustainable design topics. Important features include: Organization based upon the commercial building delivery process Robust technical content for use in actual project applications Analysis examples that demonstrate key technical principles Plenty of design data for use as a valuable design resource Abundant and sophisticated information graphics and color illustrations and photographs A distinct design focus on the content that inspires adoption of principles into projects
