The Central Cooling Plant with Optimization application uses Chiller Selector module, which provides logic to control devices, to:
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maximize the operating efficiency of the chiller plant
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minimize the total starts of the devices
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attempt to balance runtimes and start counts for the devices
If configured, the module determines the combination that best meets the requirements and turns on/off the appropriate devices in an orderly manner to arrive at the desired combination. The best combination produces the largest adjusted efficiency.
The Chiller Selector module provides individual outputs for each device, and works with either:
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dedicated or headered, constant or variable speed pumps on the condenser water (CW) system
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dedicated or headered, constant or variable speed pumps on the CHW system
For dedicated pumping, this module provides separate output commands to the pumps. For headered pumping, this module provides separate output commands to the isolation valves as well as outputs (as network variables) the required flow rates for both CW and CHW systems.
You cannot view and modify the modules in this group’s logic.
Once system selection is complete, the Chiller Selector module requires further configuration. Refer to the Johnson Controls Central Plant Optimization™ 10 Application Note (LIT-12011575) for information on configuring this module and for more application level information.