Delta-T Analysis of Chilled Water System
Objective/Method/Outcome
Objective: Determines if the delta-t of the chilled water system is low for an extended amount of time while is system is running
Method: Calculates the Delta-T of Chilled Water System and groups it into CTL bins of Daily Hours
Outcome: Triggers an Integrity KPI.
Applicable System
Chilled Water System
Description
Calculate Delta-T of a system, then group into CTL Bins of Daily Hours. Generates an insight if Delta-T is low while system is running for extended period of time.
This rule is part of the CopperTree Standard rule-set.
Diagnosis
- Ensure temperature sensors are calibrated properly.
- Consider load-based control for the CHWS. System could be disabled when there is low demand.
Message
Delta-T is low while system is active.
Rule Template Type
Insight Type: Integrity KPI
Trigger Type: Active High
Default Priority
Medium
Logic
Inputs
| Input | Unit | Tags | Description |
|---|---|---|---|
| RWT | °C/ °F | Chilled Water Return Temperature | Return Water Temperature for Chilled Water System |
| Chilled Water System Status | °C/°F | Chiller Command, Chilled Water System Enabled, Chiller Status | Status of Chilled Water System |
| SWT | °C/ °F | Chilled Water Supply Temperature | Supply Water Temperature |
| Bin 1 Temperature Threshold | °C/ °F | ||
| Bin 2 Temperature Threshold | °C/ °F | ||
| Bin 3 Temperature Threshold | °C/ °F | ||
| Bin 4 Temperature Threshold | °C/ °F | ||
| Threshold – Daily Hours of Insufficient Load | Hr |