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

HVAC Control in the New Millenniumand out as needed. When the system shuts down, the swap file stays onthe hard drive. An intruder could view data stored in the swap file. TheNT system can be configured to clear the swap file every time the systemshuts down.This can be done by using the NT Registry Editor. You go toand addHKEY_LOCAL_MACHINEClearPageFileAtShutdownThis will clear all pages except those that are still active duringshutdown.One of the common paths a hacker uses to gain access to a networkis through services running on the server. These include the ClipBookServer, Plug-&-Play and Net Log-on. Consider shutting down those thatare not needed.Smart NetworksSmart control and advanced networks define the future of controltechnology. The goal in the future will be to integrate plant-wide controlswith the monitoring of energy used for heating and ventilation.Fan rooms are having their older pneumatic controls replacedwith modern data acquisition and control. Field devices are used asinput/output devices to the PC in each fan room substation. WindowsNT is used in a PC-based control system with fieldbus communications.Benefits include lower installed costs with less wiring andtrue distributed intelligence. Communications are improved as well asdiagnostics between devices. Incorporating all control, operator interfacesand data acquisition in a single system allows a leaner overalloperation. Hardware savings can reach 25%.PC-based software like Paradym-31 provides ladder logic, sequentialfunction charts, and function-block diagrams. User-definedfunction blocks allow users to customize the HVAC application usingsoftware tool sets.PC-based control will be used for more energy saving applications.It can provide control capabilities usually missing in older classicalmethods.©2001 by The Fairmont Press, Inc. All rights reserved.