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

HVAC Control in the New Millenniumstand-alone field devices. There were still numerous interfaces to thevarious building systems and the major decisions were made at a centralcomputer.Integrated SystemsMore recent Building Automation Systems (BAS) attempt to limitthe interfaces and provide a more seamless, integrated network. Digitalcontrol networks provide an architecture that can be fully distributedwith independent controllers for the systems and subsystems in a building.Ideally, all of the various components will talk to each other in acommon language.The networked system allows improvements in plug-in instrumentation,instant decision support, documentation and automation. Intelligent,versatile instrumentation at the lowest control level allows theenergy management data to be easily organized for flexible efficientmanagement.Highly organized data collection means the facilities and operationsstaff can be more effective. The reports allow better decisions sinceFigure 2-1. Analog control closed-loop system.©2001 by The Fairmont Press, Inc. All rights reserved.