CHILLER REPLACEMENT

Delta provided electrical engineering design services for the replacement of chillers, starters, and associated equipment at the DuPage County power plant.  Four existing chillers (3-1,000 ton; 1-300 ton) were replaced with three new chillers (1-2,000 ton; 2-1,000 ton).

The electrical engineering scope included:

• Reconfiguration of existing 5 kV switchgear to accommodate 600A power to new chillers
• Reconfiguration of existing Variable Frequency Power Supply (VFPS, 600A/480V/3-PH) to accommodate power to two new 200HP chilled water pumps
• Reconfiguration of existing Motor Control Center (MCC, 600A/480V/3-PH) to accommodate power to new water pumps and fans
• Design was provided such that the power plant would remain in operation throughout entire demolition process

BOILER #2 UPGRADE

Delta provided mechanical, electrical, & controls engineering design services for upgrades to boiler #2 at the DuPage County Power Plant.

Boiler # 2 (model DW-86) was a hot water generator with a capacity of 45,000,000 BTUH. All of the power plant’s hot water generators at the time were dual-fuel, gas-oil fired units. Scope of work, including PS&E, involved the following:

• Reviewed all existing electrical and piping work
• Surveyed all components such as actuators, linkage, limit switches, shaft extensions, motorized shut-off valves, and meters
• Removed and replaced the existing pneumatic controls & safety devices
• Installed a new PID controller for automatic fuel and air flow regulation. The controller also manages metering, cross limiting combustion, and O2 trim.
• Replaced the two boiler pressure relief valves
• Modified electrical and piping work where needed