Energy saving is calculated from the difference of condenser approach temperature (CAT) which occurs between before and after cleaning condenser tube by high intensive chemical and brushing. For instant, 1°F of the difference of CAT will increase 1.5% of the power consumption of Chiller. After using Ozone system, the difference of CAT is controlled within 1°F.
For instruments used for measuring energy saving, we cannot measure it effectively since there are many effects on power consumption of chiller in each year such as average temperature, average load, hours of using, etc.