13.5 CMMS, Water Treatment, and Human Behavior in Energy Management
Key Takeaways
- A Computerized Maintenance Management System (CMMS) schedules, tracks, and documents preventive/predictive work orders and is the backbone that keeps energy-saving maintenance actually performed on schedule.
- Water treatment protects boiler, cooling-tower, and condensate systems from scale, corrosion, and biological growth—each of which directly degrades efficiency (scale raises fuel use, fouled towers lower chiller COP).
- Human behavior—occupant comfort settings, setpoint overrides, leaving equipment running, and ignoring alarms—can erase engineered savings; the CEM addresses it through training, feedback dashboards, and automatic resets.
- Savings persistence depends as much on people and maintenance discipline as on the original design; a CMMS plus a behavior program is what keeps M&V savings from decaying over time.
- Quantifying the cost of inaction—failed steam traps, uninsulated pipes, scale buildup—turns maintenance from a cost center into a documented energy-savings program.
CMMS, Water Treatment, and Human Behavior in Energy Management
The engineered measures of Chapters 4–12 only keep saving if they are maintained and used correctly. The CEM Body of Knowledge closes the Operations, Maintenance, and Commissioning domain with three enabling topics: the Computerized Maintenance Management System (CMMS), Water Treatment, and Human Behavior in Energy Management. These are the program and people layer that determine whether savings persist.
The Computerized Maintenance Management System (CMMS)
A CMMS is software that plans, tracks, and documents maintenance work across a facility. Its core functions:
- Asset registry of every piece of equipment with its maintenance plan.
- Work-order scheduling that auto-generates preventive maintenance (PM) tasks at calendar or runtime intervals.
- History and cost tracking so each asset's labor, parts, and downtime are visible.
- Inventory and spares management.
- KPI reporting—PM compliance %, mean time between failures, backlog hours.
For the CEM, the CMMS is what converts the maintenance strategy chosen in Section 13.1 (reactive, preventive, predictive, RCM) into action. A predictive-maintenance program without a CMMS to schedule and close out the work orders is just a sensor dashboard. The CMMS also feeds the quantification of losses (Section 13.4): it logs every steam-trap test, every leak repair, and every relamping, turning ad-hoc fixes into a documented savings stream.
CMMS and Energy
The CEM ensures the CMMS carries energy-relevant PMs: filter changes, coil cleaning, steam-trap surveys, combustion-tuning cycles, calibration of sensors and meters, and compressed-air leak surveys. PM compliance measured against an energy-savings baseline is a leading indicator of savings persistence.
Water Treatment
Water treatment protects the thermal systems whose efficiency the CEM is paid to preserve. Three applications dominate:
Boiler Water Treatment
- Scale control (hardness, silica): scale is an insulator—1/32 inch of scale can raise fuel use by ~2% and risks tube overheating. Treatment via softening, chemical scale inhibitors, and blowdown control.
- Corrosion control (oxygen, low pH): oxygen scavengers and deaeration prevent pitting; pH is kept alkaline.
- Carryover control: suspended solids cause foaming and steam carryover that damages downstream equipment.
Cooling-Tower Water Treatment
- Scale at the warm condenser-water interface—controlled by cycles-of-concentration management and blowdown.
- Corrosion inhibitors for the tower basin and condenser tubes.
- Biological growth ( Legionella, algae, biofilm): biocides and biodispersants; biofilm on condenser tubes directly lowers chiller COP by raising approach temperature.
- Legionella management is now a documented safety obligation, not just an efficiency issue.
Condensate Return
Returning clean condensate (Section 10.3) saves both heat and water-treatment chemistry; contaminated condensate must be dumped, wasting the embedded heat. Treatment therefore ties directly to the steam-system economics of Chapter 10.
The CEM does not run the water-treatment program but must understand its energy consequences: a fouled tower or scaled boiler quietly erodes the savings the CEM reported to management.
Human Behavior in Energy Management
Equipment is only as efficient as the people operating it. The BoK's Human Behavior in Energy Management topic recognizes that occupants and operators can erase engineered savings:
- Setpoint overrides and personal heaters defeat HVAC controls.
- Leaving lights and equipment on out of habit or after hours.
- Ignoring alarms until they become failures.
- Bypassing resets or scheduling to resolve a complaint, then never restoring it.
Behavioral Strategies the CEM Applies
- Training and awareness—operators who understand why a setpoint matters override it less. Brief, recurring sessions beat one-off posters.
- Feedback dashboards—visible, near-real-time energy displays (often fed by the IoT/cloud systems of Section 8.4) tap social comparison and goal-setting; ENERGY STAR Portfolio Manager's 1–100 score works partly through this mechanism.
- Automatic resets and defaults—designing the failure mode to be the efficient mode: night setback that re-engages automatically, schedules that reassert, overrides that time out.
- Recognition and accountability—tying energy KPIs to team or facility-manager reviews.
- Occupant engagement—comfort hotlines and quick responses that prevent the personal-heater cascade.
Quantifying the Behavior Gap
A classic CEM estimate: a 10% setpoint override across a heating season can add 5–10% to heating energy depending on climate; a single personal heater (1.5 kW) running 24/7 for a winter adds 3,900 kWh ($300–600) for one complainant. The CEM sizes the behavior program against these numbers—training and dashboards cost little relative to the savings they protect.
Why These Three Belong Together
CMMS, water treatment, and human behavior share one trait: none is a single project with a payback period. They are continuous programs whose value is measured in savings preserved, not savings installed. A CEM who installs a chiller retrofit and walks away will see savings decay; a CEM who pairs the retrofit with a CMMS-driven PM plan, a water-treatment specification, and an operator behavior program will see savings hold. That persistence is the difference between a one-time win and a career of compounding results—exactly the goal of the commissioning and O&M philosophy of Chapter 13.
What is the primary energy consequence of scale formation in a boiler?
Which CMMS function most directly supports the persistence of energy savings?
Why can occupant behavior erase engineered HVAC savings, and what is a design countermeasure?