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

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HVAC Control in the New MillenniumFigure 4-10. Fail-stop CPUs.can continue to operate in the presence of the error or failure. Thefailed component can be repaired while the system is in operation.Disaster-tolerant SystemsLocal disaster-tolerant systems site redundant parts of the systemin different locations within a building or building complex. Physicalfirewalls are used to separate the redundant components.Remote disaster-tolerant systems place redundant parts of the systemmore than a mile apart. Commercial systems, such as the passiveredundant clusters from Compaq, provide data and hot-standby capabilitiesover a distance of several miles.Information TechnologyThe information technology (IT) revolution that has been takingplace in offices is rapidly moving into building operations. This revolutionis now on its way to control systems as well as sensors and actuators.The technology is robust, fast, easy to use, and ready to run buildingsand plants. Users can now reap the benefits of this inexpensive yetpowerful technology.Several key enablers are pushing the technology into automation.Widespread Internet availability provides a universal information deliv-©2001 by The Fairmont Press, Inc. All rights reserved.
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.
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HVAC ControlIn the New Millenniumby
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Table of ContentsChapter 1Chapter 2
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The use of wireless LANs may double
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munication technologies, predict th
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ing automation. This will continue
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Artificial Intelligence, Fuzzy Logi
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Computer Networks and Security 265C
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Computer Networks and SecurityInter
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Computer Networks and SecurityNetwo
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Computer Networks and SecurityEther
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Computer Networks and Securitystruc
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Computer Networks and SecurityA bro
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Computer Networks and SecurityThinn
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Computer Networks and Securityther
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Computer Networks and Securitywork.
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Computer Networks and Securitylogic
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Computer Networks and Securitythey
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Computer Networks and Security• n
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Computer Networks and Securitywork
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Computer Networks and SecurityMany
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Computer Networks and SecurityPure
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Computer Networks and SecurityThe m
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Computer Networks and Securityavail
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Computer Networks and SecuritySever
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Computer Networks and SecurityEffic
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Computer Networks and Security 305C
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Computer Networks and Security(CAD)
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Computer Networks and Securityand f
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Computer Networks and Securitymost
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Computer Networks and Securityconne
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Computer Networks and SecurityLonMa
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Computer Networks and SecurityIn De
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Computer Networks and Securitydevic
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Computer Networks and SecurityContr
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Computer Networks and SecurityThe C
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Computer Networks and SecurityMODBU
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Computer Networks and SecurityFigur
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Computer Networks and SecurityGatew
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Computer Networks and Securitytion
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Computer Networks and Securitycontr
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Building Automation, Wireless Techn
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Table 9-4. Internet Services——
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