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Home > Science, Technology & Agriculture > Electronics and communications engineering > Electronics engineering > Direct Digital Control for Building HVAC Systems
Direct Digital Control for Building HVAC Systems

Direct Digital Control for Building HVAC Systems


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About the Book

Since the publication of the first edition in 1992, the HVAC industry has gone through enormous changes. Simple digital systems have given way to complex systems and the demand for information on how these systems work and how they are best applied has grown rapidly. This text is thoroughly updated and expanded to include coverage of the architecture of digital control systems, distributed intelligence in networked systems, DDC system network, communication protocols, digital controllers, application strategies, and designing and specifying control systems. Illustrations throughout help keep the subject accessible, and hardware, software, and systems applications are described. This second edition contains a new section on BACnet (tm), a significant development in DDC. BACnet (tm) is an ASHRAE standard adopted in 1996 which mandates that all components of a system, regardless of manufacturer, be able to communicate, thus creating "interoperability". The text should be of interest to HVAC engineers; building owners; contractors; and consultants.

Table of Contents:
1 ? Introduction to Direct Digital Control Systems.- Definition of Direct Digital Control.- Direct Digital Control versus Conventional Control.- Impact of Digital Controls on the Building Industry.- History of Electronic Controls.- Development of Digital Control Systems.- Recent Developments in Direct Digital Control.- Acceptance of Digital Controls.- Future of Direct Digital Controls.- 2 ? Fundamentals of Control Systems.- Terminology.- Control System Performance.- Control System Energy Sources.- Control System Elements.- 3 ? Fundamentals of Computer-Based Controls.- Microcomputer Fundamentals.- Organization of Computer-Based Control Systems.- Computer Communications Systems.- Elements of a Direct Digital Controller.- Direct Digital Control System Programming.- 4 ? Interfacing Digital Controllers with Conventional Control Devices.- Input Functions.- Output Functions.- Interconnecting Media.- 5 ? Interoperable Control Systems.- Control System Interoperability.- BACnet.- Echelon.- 6 ? Direct Digital Control Application Strategies.- Local Control Strategies.- Direct Digital Control of Central Plant Systems.- Variable Pumping Strategies for Chilled-Water Systems.- Direct Digital Control of Air Handling Systems.- Monitoring Strategies for Building Management.- Supervisory Control Strategies.- 7 ? Designing Direct Digital Control Systems.- Criteria for Evaluating System Needs.- Control System Design Considerations.- Evaluating Control Loops.- Evaluating Design Alternatives.- System Design Methodology.- 8 ? Specifying Direct Digital Control Systems.- System Architecture and Product Evaluation.- Acceptable Manufacturers.- Specifications.- Project Funding.- Operator Training and Support.- System Maintenance.- Additional Operation and Maintenance Considerations.-System Commissioning.- Specify to Avoid Hazards.- 9 ? Economic Analysis of Direct Digital Control Systems.- Economic Analysis of Energy Saving Strategies.- Estimating Installed Cost of Direct Digital Control Systems.- 10 ? Emerging Technologies in Direct Digital Control.- Nonhierarchical Systems.- Pattern Recognition Adaptive Control (“PRAC”).- Appendix I.- Spreadsheet Template for Motor Energy Savings Using Variable-Frequency Drives.- Appendix II.- Direct Digital Control System Manufacturers.


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Product Details
  • ISBN-13: 9780412145315
  • Publisher: Chapman and Hall
  • Publisher Imprint: Chapman and Hall
  • Edition: Revised edition
  • Language: English
  • Returnable: N
  • ISBN-10: 0412145316
  • Publisher Date: 31 Dec 1998
  • Binding: Hardback
  • Height: 235 mm
  • No of Pages: 230
  • Width: 155 mm


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