The Challenge
A facility installed a waste heat recovery system for water preheating, claiming 30% reduction in water heating energy. The claim was made in sustainability reports and used to apply for energy efficiency incentives. An auditor questioned whether actual recovery was 30%.
What Became Visible
Without continuous monitoring, actual heat recovery was unknown. The heat exchanger was sized for 30% recovery at peak conditions, but actual recovery was: (1) Lower during part-load operation. (2) Degraded due to fouling over time. (3) Variable seasonally. Actual average recovery was 18%, not 30%. This invalidated the facility's sustainability claims and disqualified incentive applications.
What Changed
Heat recovery monitoring system installed with temperature and flow sensors. Actual heat recovery calculated continuously. Monthly reports document recovery rate and trends.
How it worked: Temperature sensors on inlet/outlet and flow meters measured actual heat transfer. Recovery rate was calculated hourly. Monitoring revealed: average recovery 22% (higher than measured but lower than claimed 30%). The facility revised sustainability claims to 22% actual recovery. This actual data was acceptable to auditors and regulators.
Results
continuous measurement
auditor-valid
verified by monitoring
with actual recovery data
Unmonitored energy savings claims are questioned by auditors. Continuous monitoring provides compliance documentation for energy efficiency claims.
Operational Reality
Most energy efficiency installations underperform theoretical calculations. Actual monitoring reveals real performance and validates compliance claims.