Since the publication of the first edition in 1992, the HVAC industry has gone through enormous changes. As simple digital systems have given way to more complex systems, demand for information on how these systems operate, how they are best applied and how they communicate with other building control systems has grown rapidly. Direct Digital Control for Building Systems, Second Edition is thoroughly updated and expanded to include coverage of the architecture of modern digital control systems, distributed intelligence networked systems, communication protocols, the technologies and issues concerning interoperability, the latest application strategies, and defensive techniques for designing and specifying control systems. Numerous illustrations throughout help keep the subject highly accessible, and hardware, software, and systems applications are described in the most universal terms possible. This thoroughly revised second edition also contains a full section on BACnet® standard and Echelon's LonWorks® technology; their meaning, applications, and future implications. An up-to-date appendix is provided. Insights on emerging technologies in intelligent control systems and what the future holds for this dynamic field is covered throughout.

It emphasizes throughout the high performance, reliability, and reduced cost of modern digital sensors, control devices, microprocessors, computer memory, and other electronic components.

An important reference for anyone associated with designing, implementing, or improving direct digital control (DDC) systems for HVAC operations. Table of Contents: Introduction; DDC System Architecture; Input/Output Devices; Program Capabilities; Applications Software; DDC System Design and Project Organization; DDC System Procurement; Installation, Startup and Acceptance; DDC System Support and Operation; Glossary. 150 illustrations.

Over two million commercial buildings in the U.S. are controlled by direct digital control (DDC) or like systems, and the trend is toward totally intelligent buildings by the end of this century. Even though DDC is quickly replacing traditional methods of controlling temperature, humidity, lighting, security, and life safety in commercial office buildings, guidance on the fundamentals, applications, and economics of DDC has been difficult to find. Applications-oriented and written from a practical point of view, Direct Digital Control for Building HVAC Systems is one of the first books to familiarize the reader with how to' specify, purchase, and support microprocessor-based building control systems. Even those with limited knowledge of digital technology will be enabled to implement DDC systems, thanks to down-to-earth descriptions of the purpose, benefits, and limitations, design, construction, operation, and cost of these systems. Especially valuable are the book's methods for interfacing digital control with existing HVAC systems. Mechanical engineers involved in the design of building control systems, mechanical estimators, facilities, plant, and building operations and maintenance personnel in both the public and private sector will all find this book a valuable resource.

1-Heat, Ventilation and Damper Control Trends2-Energy and Power Management, Distributed Control Trends3-Control Technology, Microelectronics and Nanotechnology4-Advance HVAC Control, Information Technology and Open Systems5-PC-based Control, Software and Bus Trends6-Artificial Intelligence, Fuzzy Logic and Control7-Computer Networks and Security8-Systems and Device Networks9-Building automation, Wireless Technology and the InternetIndex