Hot water supply temperature control is poor

Objective/Method/Outcome

Objective: Determines if the hot water supply temperature is poor

Method: The actual temperature of the Hot Water Supply and the setpoint is found and checked if it greater than the dead band for more than the appropriate amount of time during operational hours.

Outcome: Triggers an Integrity KPI

Applicable System

HWS

Description

Determine the error severity of a hot water temperature control system in degree*hours.

This rule is part of the CopperTree Standard rule-set.

Calculate the severity metric based on the absolute difference between the water temperature and the water temperature setpoint deadband while the water temperature is outside of the deadband during scheduled hours.

Diagnosis

  1. Issue with control loop. Review and modify controller tuning parameters.
  2. Automatic setpoint control has been overridden. Revert setpoint back to automatic control.
  3. Input sensor(s) faulty or miscalibrated. Verify input sensor(s) operation.

Message

The hot water supply temperature has deviated from the setpoint for more than 15 degree*hours per week while the system is enabled. Review controller tuning parameters.

Rule Template

Insight Type: Integrity KPI

Trigger Type: Active High

Default Priority

Medium

Logic

Logic flow for determining if hot water supply is faulty

Inputs

Input Units Tags Description
Hot Water Supply Temperature °C/ °F Hot Water Supply Temperature The recorded hot water temperature.
Hot Water Supply Temperature Setpoint  °C/ °F Hot Water Supply Setpoint The setpoint for water temperature
Status Hot Water System Enabled, Boiler Status To detect if HWS is operational
Const. – Temperature Threshold °C/ °F To minimum temperature deviation from setpoint beyond which an insight would be generated
Const. – Acceptable Weekly Threshold °*hr
Days of operation annually Days per year the system is operational
Cost per Degree*Hour $

Notes

CTL generated:

HWST Severity KPI