HVAC Control in the New Millennium.pdf - HVAC.Amickracing

munication technologies, predict the value of improvements gained byintelligent field devices and grasp the business drivers behind integration,industrial web technologies for HVAC and security features of industrialnetworks.Chapter 1 introduces heat, ventilation and damper control trendsas well as air conditioning trends. Basic concepts such as the propertiesof air, filtering and heat transfer are described. Zone control and yeararoundair conditioning are explained along with air washing. The conceptof HVAC intelligence is introduced and advanced motion controlfor dampers including feedback devices, networking and PCs with digitaldrives are covered.Chapter 2 considers energy and power management trends. Distributedcontrol levels include HVAC, communications and informationmanagement. Topics include direct digital control and proportional zonecontrol.Future computer-based systems for intelligent buildings and controlsmay use biochemical computers. Device communications for theintelligent I/O appliances used in complex adaptive systems may takeplace in industrial networks that use wireless connections.Control technology and microelectronics are the main subjects ofChapter 3. After a summary of control modes and their characteristics,supervisory control techniques are considered for system optimizationand old and new control concepts are compared. Advances in microelectronicspush much of the new computer applications. The computerevolution is due to shrinking devices. Nanotechnology will producemolecular and protein machines which are new types of molecular computers.Universal assemblers and disassemblers will build and rebuildfuture products. Reconfigurable computers with reconfigurable hardwareare even closer in our future.Chapter 4 looks at advanced HVAC control, information technologyand open systems trends. Semiconductor manufacturing involvesadvanced HVAC control concepts including air contamination, zoneoptimization, pressure control, flow control and pollution control. Intelligentalarms will use expert systems reasoning. Fault tolerant systemscan use passive redundancy or active redundancy.Windows NT has become a de facto standard for control systemswhile Ethernet use has expanded as a plant control network. If feedforwardis not used properly for HVAC, a number of errors can bepropagated. This is explained in Chapter 4.©2001 by The Fairmont Press, Inc. All rights reserved.