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

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

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<strong>HVAC</strong> <strong>Control</strong> <strong>in</strong> <strong>the</strong> <strong>New</strong> <strong>Millennium</strong><strong>in</strong>telligent actuators. In common areas such as <strong>the</strong> ballroom, <strong>the</strong> lobby,and <strong>the</strong> restaurant, <strong>in</strong>telligent space sensors are used to transmit networkmessages back to <strong>the</strong> actuators that control <strong>the</strong> zone dampers. In<strong>the</strong> air handl<strong>in</strong>g equipment used, <strong>the</strong> separation of <strong>the</strong> hot and colddeck dampers caused a synchronization problem which was solved by<strong>the</strong> tim<strong>in</strong>g facilities of <strong>the</strong> neuron chips <strong>in</strong> <strong>the</strong> actuators. This was adjustedso that both dampers would always operate <strong>in</strong> <strong>the</strong> correct positions.The operation of <strong>the</strong> heat<strong>in</strong>g and cool<strong>in</strong>g valves are also underLonWorks control.The system operates <strong>in</strong> a W<strong>in</strong>dows-based environment and allows<strong>the</strong> monitor<strong>in</strong>g of control system data, reset fan temperatures, turn<strong>in</strong>gequipment on and off and adjusted operat<strong>in</strong>g parameters. Dedicatedchannels on <strong>the</strong> CATV backbone are used for guest services such asmonitor<strong>in</strong>g <strong>the</strong> m<strong>in</strong>i-bar, controll<strong>in</strong>g <strong>the</strong> heat<strong>in</strong>g, and provid<strong>in</strong>g realtimesecurity with a door lock<strong>in</strong>g system.Products with open protocols embedded <strong>in</strong> <strong>the</strong>m are more flexible.For example, <strong>the</strong> retrofitt<strong>in</strong>g of a light<strong>in</strong>g system with occupancy sensors<strong>in</strong> <strong>the</strong> build<strong>in</strong>g can be done to provide more natural light and decrease<strong>the</strong> artificial light usage.Lon-enabled products provide multiple sources of application-specificcontrollers and programmable devices. These basic elements provideanswers to <strong>in</strong>tegration requirements.Products that are cheaper and faster to manufacture are <strong>the</strong> trendfor <strong>the</strong> future. The benefits of LonMark products <strong>in</strong>clude <strong>the</strong> choice ofvendors, easy <strong>in</strong>tegration, additions and changes and reduced <strong>in</strong>stallationcosts.There has been a tremendous shift <strong>in</strong> <strong>the</strong> implementation and utilizationof control systems. This shift has been from discrete sensors andanalog devices to more <strong>in</strong>telligent, processor-based networks of sensorsand devices that return both data values and diagnostic <strong>in</strong>formation.These <strong>in</strong>telligent automation solutions are based on device busnetworks. Open PC technology such as E<strong>the</strong>rnet and OLE for processcontrol (OPC) is coupled with device bus networks. This allows desktop,<strong>in</strong>dustrial, and laptop computers to be powerful connection tools.The future requirements for control systems demand that an ever<strong>in</strong>creas<strong>in</strong>g amount of <strong>in</strong>formation be provided. The trend is towardsopen architecture-based technology that replaces proprietary equipment.This force has sparked a era of <strong>in</strong>novation that has led to <strong>the</strong> leverag<strong>in</strong>gof exist<strong>in</strong>g PC technology.©2001 by The Fairmont Press, Inc. All rights reserved.

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