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Official publisher & professional services provider of Scilab, Open Source So+ware for Numerical Computa5on & Simula5on
Jean-Pierre Bovée ScilabTec 26/6/2013Jean-pierre.bovee@sanofi.com
Our way to energy savings
How does Scilab contribute to this goal?
Agenda
• Understanding Energy Savings opportunities
• Focusing on Heating, Ventilation and Air-
Conditioning (HVAC):
– what it should cost (OPTICLIM: a simulation tool)
– What it actually costs
– How to cut related energy bill
• Next steps
• Conclusion
Understanding opportunities
A typical Air Handling Unit (AHU)
HVAC bill cutting schedule
Select an « easy » AHU
Site HVAC mapping
HVAC data collection
Easy: clear zone sharing with other AHUs, easy way to collect
real time data and further to change setpoints and working
schedule
Specifications of:• Room(s) • AHU Chillers and boilers � To populates simulation tool (OPTICLIM)
Populate OPTICLIM wih AHU collected data � get estimated
current energy consumption
Collect AHU real time data� Estimate energy
consumption
Based on this + site HVAC mapping, Identify energy � opportunities, using OPTICLIM
Matching± 20%
Question real data and actual AHU tuningNO
Validate with QA, HSE and Production
Implement and check actual energy bill reduction
A bad matching can originate from stuck valve, cabling error, poor control implementation, …
Monitor T°, RH, air flows and valves positions for heating and cooling valves
How Scilab contributes to energy savings
Estimate, Simulate, pre-select Savings opportunities
Check against current Data collected from the process
Confirm savings opportunities
Finalize , then run action plan
Check against current Data collected from the process
Scilab: Energy simulation (OPTICLIM)
Scilab: Energy monitoring
Scilab: Energy monitoring
Scilab: Energy simulation (OPTICLIM)
OBJECTIVES TOOLS
Air Handling Units
Real time Monitoring
o Atom module (Modbus over TCP/IP)
o We need to have a robust application: working with
Modbus over TCP/IP is a must.
o Modbus is the most common communication mode in
the industrial world
o Real time data collection: Scilab Team developped an
HVAC
what it should cost (OPTICLIM)
Objective
• Knowing this initial scenario
– AHU, boilers and chillers specifics
– Weather conditions
– Rooms specifics
– Working schedule
• Calculate expected consumption as for:
– Ventilation and auxiliaries
– Heating and cooling energy
• Simulate other scenario to reduce energy bill
• Select modifications versus payback
Some limits of the « Excel ware »
• Initially, OPTICLIM has been drafted using Excel.
• Lack of development good practicies from developpers
• With no seggregation between data and calculation, the application size
amounts to over 200 Mo (as of today)
• It could even increase with more to come weather data (10 years of data,
hour per hour)
• Maintenance might become a nightmare.
• Deployment across our organisation would no longer be sensible.
� Decision to migrate OPTICLIM as a Scilab application.
� « Exel ware », as an uncontrolled development, may turn a night mare …
| 10
Site HVAC initial Temperature mapping
20,5°C + 0,1°C
20°C + 0,1°C
21,7°C + 0,5°C19
,6°C
+ 0
,5°C
20,5
°C +
2°C
19,6°C + 0,1°C
19°C + 2°C
21°C + 0,1°C
19°C + 1°C
18°C + 2°C
20°C + 0,1°C
We notice:
• some quite unrealistic
setpoint tolerances
(0.1°C)
• setpoint discrepancies
that cannot be
explained by any
rationale related to
product considerations
HVAC
While checking OPTICLIM
Challenging rooms set points (T°, RH)
• First step: setpoints mapping
– Rooms
• T° and RH (if relevant) set points + control tolerance (paramount)
• Products manufactured in the room
– Question differences: why should identical product are manufactured
with different T° or RH setpoints
– Question Tolerances: ex � a tolerance of 0.1 °C is exactly
counterproductive
• Discuss with QA and Production
– Streamline the initial mapping (but do not change anything on the
AHU at this time)
| 12
HVAC site mapping: changing Temperature
setpoints at the weekend
19°C + 2°C
17°C + 6°C
19°C + 2°C
19°C + 3°C
19°C + 3°C
19°C + 2°C
19°C
+ 2
°C
19°C + 2°C
19°C
+ 3
°C
19°C + 3°C
19°C + 2°C
19°C + 2°C
19°C + 3°C
19°C + 3°C
19°C + 3°C
HVAC
speak with data
Make actual measurements on AHU(s)
• record these values over at least 3 days
• T°, HR, air flowrate(s) (current values and setpoints)
• setpoints applied to control valves (a source of big surprises…)
• understand ∆ between measured values and estimated values by OPTICLIM
• A control valve sometimes remain stuck
• Control systems can perform very poorly for various reasons
• tolerance is too small
• cabling errors on sensors or actuators
HVAC
speak with data
Start changing working conditions (AHU setpoints, reduced
mode, etc…)
• Estimate savings using OPTICLIM
• Apply the ones selected
• Measure actual savings
| 15
Identify energy � opportunities, using OPTICLIM
Step 1: changing Temperature setpoints at working hours
AHUInitial
T+∆t
New
T+∆t
Saving on
Air-heating
Saving on
Air-cooling
Total
savings (%)
total
savings(€)
501 20+0,1 20+2 -5,2% -62,1% -7,4% -953 €
505 20+0,1 20+2 -8,9% -53,0% -7,4% -3 378 €
506 20,5+2 20+2 -0,4% 18,1% 0,3% -459 €
508 20,5+0,1 20+2 -2,3% -54,2% -2,9% -563 €
509 21+0,1 20+2 -1,9% -37,4% -2,0% -1 338 €
510 21,7+0,5 20+2 -1,5% -23,5% -1,4% -1 033 €
511 19+2 20+2 -2,7% -33,5% -3,1% 213 €
517 19,6+0,5 20+2 -4,8% -57,4% -7,1% -1 073 €
518 19,6+0,1 20+2 -6,0% -68,8% -7,3% -868 €
519 21+0,1 20+2 -1,1% -35,7% -2,3% -445 €
525 19+1 20+2 -9,5% -32,2% -4,0% -2 161 €
526 19+2 20+2 -7,2% -60,8% -6,8% 256 €
527 20+2 20+2 0,0% 0,0% 0,0% 0 €
Σ of Expected annual savings from Temperature setpoint changes: - 11 802 €
Microsoft Excel Worksheet
| 16
Identify energy � opportunities, using OPTICLIM
Step 2: changing Temperature setpoints out of working hours
AHU
Over the
week
T+∆t
Weekend
T+∆t
Saving on
Air-heating
Saving on
Air-cooling
Total
savings (%)
total
savings(€)
501 20+2 17+6 -39,8% 10,7% -26,0% -2 472 €
505 20+2 17+6 -45,9% 9,6% -20,3% -5 671 €
506 20+2 17+6 -45,5% 10,6% -23,6% -4 891 €
508 20+2 17+6 -18,8% 7,5% -11,0% -1 336 €
509 20+2 17+6 -34,2% 8,7% -18,2% -3 655 €
510 20+2 17+6 -43,9% 9,9% -20,8% -2 166 €
511 20+2 17+6 -41,2% 8,5% -25,2% -3 396 €
517 20+2 17+6 -36,5% 12,5% -23,0% -4 540 €
518 20+2 17+6 -35,2% 10,2% -20,2% -2 336 €
519 20+2 17+6 -22,6% 17,1% -15,0% -812 €
525 20+2 17+6 -28,8% 9,3% -6,8% -1 153 €
526 20+2 17+6 -43,9% 10,5% -19,8% -2 901 €
527 20+2 17+6 -38,6% 11,2% -22,2% -3 328 €
Σ of Expected annual savings from Temperature changes out of working hours
-36,4% 10,4% -19,2% -38 657 €
| 17
Identify energy � opportunities, using OPTICLIM
Step 3: changing ventilation setpoints out of working hours
AHU over the
week Flow
rate
Weekend
Flow rate
Saving on
Air-
heating
Saving on
Air-cooling
Savings on
ventilation
Total
savings (%)
total
savings(€)
501 7255 5000 -19,3% -21,8% -24,9% -21,9% -1 467 €
505 23000 15000 -22,5% -5,8% -26,9% -24,3% -4 494 €
506 9370 5000 -37,7% -30,9% -37,6% -37,3% -5 275 €
508 6600 6600
509 11760 11760
510 8660 8660
511 10750 9500 -7,1% -5,0% -9,0% -7,9% -766 €
517 9900 7000 -22,6% -20,6% -23,5% -22,8% -3 380 €
518 6350 6350
519 1500 1500
525 16500 10000 -26,1% -6,7% -30,8% -28,3% -4 299 €
526 10500 7000 -24,1% -21,1% -26,5% -25,5% -2 843 €
527 9500 7000 -17,7% -18,7% -20,9% -19,5% -2 288 €
Σ of Expected annual savings from ventilation change: -24 812 €
• Temperature : 17°C.
• Tolerance : +6°CLe fichier excel
Σ of potentia
l savings: 70 k€ / year
So about 15% savings
| 18
Initial temperature setpoints at the week-end
19°C + 2°C
19°C + 2°C
19°C + 3°C
19°C + 3°C 19°C + 3°C
19°C + 2°C
19°C
+ 2
°C
19°C + 2°C
19°C
+ 3
°C
19°C + 3°C
19°C + 2°C
19°C + 2°C
19°C + 3°C
19°C + 3°C
19°C + 3°C
| 19
Speaking with data: Changing temperature
setpoints at the week-end � initial situation
Supplied air
extracted air
Cooling valve
| 20
Speaking with data: Changing temperature
setpoints at the week-end (17°C + 6°C)
Supplied air
extracted air
Cooling valve !
Beginning of the weekend
End of the weekend
Reason why it is so important to monitor control valves (heating and cooling)
What an unrealistic temperature tolerance (0.1 °C) can result in
Supplied air
extracted air
Cooling valve
heating valve
This situation is just TERRIBLE ���� heating and cooling valves oscillations result in an enormous energy wa ste
Reason why it is so important to monitor control valves (heating and cooling).Just enlarging
Supplied air
extracted air
Cooling valve heating
valve
Cutting Energy bill / Next steps
o At Sanofi global level
o Achieve migration of the simulation tool from Excel � Scilab
o Otherwise no effective deployment across our sites will ever happen
o Train all sites (> 100)
o At our site level (Lisieux)
o Check Excel migration with Scilab Team
o Deploy AHU monitoring
o Enhance AHU control using model based control (i.e. predictive control) � still 8 to 10% of potential savings
o Package this approach (simulation, monitoring, enhanced control) to pass it on to other sites
ConclusionHVAC: to conduct a wise energy bill reduction
o The right sequence appears as:
o Question HVAC in terms of
o Environment setpoints versus manufactured products requirements and
working schedule
o Actual control tuning (monitor setpoints AND actuators)
o Simulate changes (OPTICLIM)
o Speak with other business function: QA, Production, Energy management, …
o Implement changes having an acceptable payback, considering future energy
cost increase
o Do not stay dependant on equipment or services performing poorly
o Then and only then, think about changing boilers, chillers or energy production
equipment
And remember!
Scilab definitiv
ely helps achieve all of th
ese goals
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