Un estratto da una presentazione ad un corso aziendale sulla definizione ed uso degli EnPI

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