Delta-T Analysis of Hot Water System

Objective/Method/Outcome

Objective: Determines if the delta-t of the Hot water system is low for an extended amount of time while is system is running

Method: Calculates the delta-T of Hot Water System and groups it into CTL bins of Daily Hours

Outcome: Triggers an Integrity KPI.

Applicable System

Hot 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

  1. Ensure temperature sensors are calibrated properly.
  2. Consider load-based control for the HWS. 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

Logic flow for determining the Delta-T for Hot Water System

Inputs

Input Unit Tags Description
RWT °C/ °F Hot Water Return Temperature Return Water Temperature for Hot Water System
Hot Water System Status °C/ °F Boiler Command, Hot Water System Enabled, Boiler Status Status of Hot Water System
SWT °C/ °F Hot 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