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

Advanced HVAC Control, Information Technology and Open SystemsFlow ControlEach workstation has its own mixing box for modulating the ratioof cold and hot air to satisfy the requirements of the space thermostat(Figure 4-4). The total air supply flow to a workstation should be equalto 60 air changes per hour plus the exhaust rate from that subzone.The total air supply rate should be controlled to ±5% of the actualflow over a flow range of 3:1. The rangeability of 3:1 is needed to sup-Figure 4-4. Workstation environment control.©2001 by The Fairmont Press, Inc. All rights reserved.