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

Control Technology, Microelectronics and Nanotechnologyto communicate with outside systems. These systems must also accommodatea variety of connectivity standards that are evolving:• IEEE 1394 for consumer electronics,• IRBus for remote controls,• IEEE 1451 for smart sensors and• Universal Serial Bus (USB) or Device Bay for personal computers.Connectivity is the key to the convergence of computer andcommunications electronics. It is also the key enabling technology insafety or security applications found in buildings. The connectivityrevolution brings vast new options and new opportunities including apersonal computer controlling HVAC equipment or an Internet remotemonitor. Connectivity will change forever the way we view systemapplications. Open system connectivity, user flexibility and selfconfigurationin a more complex environment are becoming the pathto the future. This means Internet access for remote control of lightsand heat that allow the temperature to be right when you get to youroffice or home.Historical systems for damper control might include a remotemotor controller, motor and mechanical lever arm. Today’s designmight include air flow or pressure sensors and perhaps current sensingin the motor.Security systems now typically use encryption and rolling codesfor authentication. The security system may even sound an alarm ifhackers try random codes to break in. There are many different technologiesand possible ways to wire the system.Wireless Security SystemsWireless security systems are being used for building management.The Town Center at Boca Raton, Florida, upgraded its security systems byinstalling a 900-MHz Frequency Agile FA system from Inovonics. The costof hardwire systems was almost three times more expensive.The mall’s common-area doors were equipped with magnetic contactsand glass-break detectors. When a contact trips or door glass breaks,a transmitter sends out a signal over the 902- to 928-MHz industrial-scientific-medical(ISM) frequency band to a receiver at an off-site securitycompany. The same alarm is transmitted over the security staff’s radio©2001 by The Fairmont Press, Inc. All rights reserved.