- An Energy Performance Indicator (EnPI) is a type of Key Performance Indicator used to measure the energy performance of a company's processes. - EnPIs can be used as quality, cost, service, or time indicators. They involve periodically checking energy consumption, analyzing variables that influence energy use, and estimating future consumption and savings. - EnPIs are important for an Energy Management System to check overall performance and ensure the system is based on measurable data and information like other management systems. They require defining the relationship between energy use and relevant variables.

1. estratto
Energy Performance Indicator
• A kind of Key Performance Indicator
• Measure of performance of a company process (energy)
• General indicator
• Quality indicator
• Cost indicator
• Service indicator
• Time indicator
further information: http://www.kpilibrary.com/
daniele.sogni@progepiter.it www.progepiter.it

2. Energy Performance Indicator
3.13 - 4.4.5 Energy performance indicators
• periodic check of energy consumption (energy costs are
NOT generic costs but they must be monitored and
checked)
• analysis about variables of energy uses (16001 energy
factors)
EnPI
• check present uses & consumptions
• calculate future consumptions
• estimate consumptions (savings) of
design/procurement
• check achievement of objectives/targets
daniele.sogni@progepiter.it www.progepiter.it

3. Energy Performance Indicator
Why indicators?
EnMS is a section of MS so:
• it’s important to check global performance
• same methodology about documents, records, review, etc.
• it’s based on data, informations, measures, etc.
So indicators are needed!
daniele.sogni@progepiter.it www.progepiter.it

4. Energy use
CONTROLLED BY PRODUCTION
CONTROLLED BY PHYSICAL PROCESSES
PROCESSES • Irregular and complex relationship
• Regular relationship between between use and variable(s)
use and variable(s) • Complex definition of energy
use/variable(s)
• Simply definition of energy use
• More important variables such as
• Simply definition of energy
production intensity, failures,
variable(s) start/stop steps, human control
• Past & present energy data easy • Past and present energy data
to find o calculate (generally) complex to find o calculate (required
monitoring)
daniele.sogni@progepiter.it www.progepiter.it

5. Energy use/variable relationship
E = f (X, Y, Z) + j
where
E = energy consumption, either electricity, nonelectric energy, or
total site energy (TSE,
the total measure of fuel, thermal and electricity)
Y = production, measured by physical production
X = systematic economic decision variables (i.e., labor hours
worked, materials
processed, plant capacity, or utilization rates)
Z = systematic external factors (i.e., heating and cooling DD)
j = error
daniele.sogni@progepiter.it www.progepiter.it

6. Energy use/variable relationship
daniele.sogni@progepiter.it www.progepiter.it

7. Energy use/variable relationship
Macchina 1
30.000 6.000
25.000 5.000
20.000 4.000
n. colli
KWhe
15.000 3.000
10.000 2.000
5.000 1.000
0 0
2008/01 2008/03 2008/05 2008/07 2008/09 2008/11 2009/01 2009/03 2009/05 2009/07 2009/10 2009/12
M1 n. colli
daniele.sogni@progepiter.it www.progepiter.it

8. Calculation of EnPI
Simple ratio
1 information
daniele.sogni@progepiter.it www.progepiter.it

9. Calculation of EnPI
Straight-line model
Each consumption stream could
have a target performance
characteristic.
Organisation needs to answer this
question:
“How much energy have we used,
compared with what we would
have expected in the absence of
energy-saving measures?”
daniele.sogni@progepiter.it www.progepiter.it

10. estratto
Evaluation of EnPI
Please verify your EnPI!
daniele.sogni@progepiter.it www.progepiter.it