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

Advanced HVAC Control, Information Technology and Open Systemsery mechanism. Internet and Intranet technologies provide the backbonefor distributed information and control system architectures that growwith the use of object-based applications.Objects and components play an important role supporting thedistributed architecture that Internet technology provides. Object technologieslet users achieve effective models of the processes under controland reduce the time needed to implement new systems. They dothis by creating libraries of component models that are easy to use andreuse which allows projects to grow and prosper.These modular, objects allow incremental improvements in thecontrol system without having to reconfigure the complete system. Inthe future object-oriented tools will expose even greater benefits as thenext generation of object-based control systems develops.Mass-market TechnologyInstead of using proprietary architectures, products based on massmarketbusiness operating systems and development tools tend to leveragethe large existing installed base. Many human machine interface(HMI) products rely on Visual Basic instead of their own scripting languageto save costs.The closed, proprietary nature of automation is mostly in the past.Open solutions provides easily integrated packages from differentsources. Open control overcomes the limitations of proprietary systemsfrom single sources.Many distributed control system (DCS) suppliers provide a WindowsNT-based system. Software suppliers provide soft DCS systemsand control solutions based on PC-based architectures and open-networkingprotocols. GM has already tested NT real-time extensions tovalidate their performance and reliability. The new breed of open-architecturecontrol systems is based on PC control.NT - De facto StandardThis revolution includes Microsoft’s Windows NT emergence as ade facto standard for operator interfaces and for PC-based control. Windowsproducts are appearing in a wide range of scalable configurations,©2001 by The Fairmont Press, Inc. All rights reserved.