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Savings 3-4 % of total heat demand or350.000 Nm3 of Gas savings or 65.000 Euro/5 years or 393.750 kg CO2 reduction.
Pascal Stijns2008
Solution : free cooling during autumn/winter/spring time
The system delivered 576.000 kWh of cooling in 2007 which is close to 15 % of the total. Savings close to 15.000 Euro/year.
Pascal Stijns2008
How to produce at the lowest cost ?
Changing energy prices
0
0,02
0,04
0,06
0,08
0,1
0,12
0,14
01-0
304
-03
07-0
310
-03
01-0
404
-04
07-0
410
-04
01-0
504
-05
07-0
510
-05
01-0
604
-06
07-0
610
-06
(Eur
o/kW
h)
Changing demand
Do we produce : - Cooling by means of absorption or electrical chillers or free cooling ?- Heating by means of steam or hot water boilers or Cogen ?- Electricity by means of self generated cogeneration or do we import from the grid ? - Can we forecast 48 hours ahead
Economical Economical OptimisationOptimisation : closing the loop: closing the loop
EBI
Availability yield > 98 %
DemandForecasting
EconomicalProduction
Optimisation
Close – loopSet point settings
Equipment scheduling
SetpointControl48 h Weather
ForecastMeteoconsult
Facility
Pascal Stijns2008
Optimum versus base line
Non WKK gas
WKK1WKK2
CV
STK1 TSA1
STK2
TSA2
E-Import
Emergency Cooling
Total Gas
Electrical Chiller
AbsorbtionChiller
WKK-E-Production
-150.00
-100.00
-50.00
0.00
50.00
100.00
150.00
200.00
%-Less
%-More
Pascal Stijns2008
Year 2003-2007 Savings
Year 2003 : 75.000Year 2004 : 90.000 Year 2005 : 100.000 Year 2006 : 120.000 Year 2007 : 140.000
525.000 Euro
Heerlen 2003 Savings YTD
0
2000
4000
6000
8000
10000
12000
14000
Jan feb mar Apr May Jun Jul Aug Sep Oct Nov Dec0
10000
20000
30000
40000
50000
60000
70000
80000
Savings Accumulated
Pay back time : 3Pay back time : 3--5 years5 years• Study
• Metering
• Control
• Economical Optimisation
• Condenser
• Free Cooling
• HVAC Heat recuperation
Pascal Stijns2008
Have we made the right decisions in 2001 ?Electricity Price Evaluation
0
0.02
0.04
0.06
0.08
0.1
0.12
0.14
0.16
2003 2004 2005 2006 2007 2008
Euro
/kW
h
Day Night
Gas/Electricity price ratio
0 1 2 3 4 5 6
2003
2004
2005
2006
2007
2008
Day Gas/E ratio Night Gas/E ratio
Natural Gasprice Evaluation
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
jan feb mar apr may jun jul aug sep oct nov dec
Euro
/Nm
3
2003 2004 2005 2006 2007 2008
Pascal Stijns2008
Economical Optimisation :The right decision at any time
“Not only this project is financially attractive but it allows the Hospital to envisage the future deregulation of the energy market and the future change of the demand side in the most efficient manner”