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Building Controls: HVAC and Lighting
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The Client:
Major computer manufacturer.
The Requirement:
Controls contractor for complete building
automation system, including central equipment room,
offices and manufacturing and lab areas. The utilities
supported included room air, class 1000 clean rooms,
smoke evacuation, lab exhaust, water, compressed air,
lighting, and interface to fire control system. Provided
turnkey package with programming, panel fabrication,
site installation and startup services. The system included
3500 I/O points.
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The Design Solution:
The building was divided into 12 zones with
local cell controllers supporting all systems in a zone. Each
cell was comprised of 5-8 distributed controllers responsible
for the individual subsystems and a supervisory cell controller
primarily used for program storage. The central equipment
room has a similar controls architecture, with distributed
controllers responsible for each piece of equipment and cell
controllers assigned to each system.
A central control console with a graphical
user interface is located in the equipment room and another
one in the facilities office that can monitor and effect the
operation of any device in the building. The operator sees
a seamless view of the facility. In addition modems were installed
for remote service capabilities.
One of the most sophisticated parts of the
control system is the smoke evacuation system. A single alarm
would affect the operation of most of the equipment in the
building, requiring interlocking of all distributed controllers.
On an alarm, the air in the alarm zone is evacuated, adjacent
areas are pressurized, adjacent floors are pressurized, and
the air handlers in the equipment room are run up to maximum
capacity and redirected to full exhaust.
Another one of the more sophisticated systems
is the energy management system. This system analyzes outdoor
air qualities, indoor air qualities, fan and chiller power
usage and calculates optimum chilled water and air supply
parameters.
The facility is designed to support labs
throughout with six air handling systems in every location
providing office air, general lab air, purified lab air, general
exhaust, acid exhaust, fume exhaust. Balancing the pressure
controls between these systems was a trick.
Major Automation Equipment
- PLC - Computer Controls AC2, LC3
- Sensors/Actuators - Setra, Parker, Manesman, Honeywell
- Network - Computer Controls Net, Telephone
- Computers - PC Compatible
- Software - DOS
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