In partnership with CNI and ABRACE, FIGENER produced in 2012 a document with the concepts of a measurement and verification methodology (M&V) in order to clearly identify the reduction in energy consumption (electricity and fuels) and the respective reduction of greenhouse gas emissions resulting from industrial energy efficiency projects.
The methodology can be found on the CNI website:
The defined concepts should guide the M&V process for energy efficiency actions applied to the following equipment:
- Drive sets (electric motors, couplings and frequency inverters)
- Hydraulic pumps
- Boilers
- Combustion furnaces
- Dryers
- Electrolysis.
They start from the guidelines of the IPMVP (International Performance Measurement and Verification Protocol) and focus on a complementary technical level. The savings related to an energy efficiency action will be calculated based on the “Avoided Energy Use” method, defined in item 4.6.1 of the IPMVP. Avoided consumption is the difference between the theoretical energy that the equipment would consume if there were no efficiency action and the energy effectively consumed after the implementation of the measure. While the second can be easily obtained by measuring and recording energy consumption, the first must be calculated
da seguinte forma:
- Energy consumption (electricity and fuel) and production are measured and recorded in a pre-execution period of the energy efficiency measure, defined as the reference period.
- The curve is constructed and the equation of average consumption (or average specific consumption) is obtained according to the production of the equipment (of the load). When the equipment has thermal and electrical consumption, an equation must be built for each one of them.
- Post-execution productions are measured and recorded
- Substituting the post-execution period productions in the pre-execution period (reference) equations, we obtain the energy that the equipment would consume if there were no efficiency action.
The methodology also takes into account other factors that may directly interfere with the specific consumption and that are not associated with the characteristic of the equipment, such as variations in the composition and humidity of the raw material, variations in the composition of the final products, etc. In order to prevent changes in these variables from affecting the savings calculation, the methodology foresees that comparisons between pre- and post-execution consumptions are always carried out on the same basis, that is, it is necessary to compare moments when these variables are equal. For this to be done, they must also be measured and recorded.
Based on energy savings, the impact on greenhouse gas emissions is calculated using factors already known, obtained through the IPCC (Intergovernmental Panel on Climate Change).