Embed Size (px)
Citation preview
Pascal Stijns2008
HoneywellHoneywell Energy ServicesEnergy Services
Atrium HospitalAtrium HospitalTriTri--Generation OptimisationGeneration Optimisation
HeerlenHeerlenNetherlandsNetherlands
20032003--2007 results2007 resultsPascal Pascal StijnsStijns
Pascal Stijns2008
Where is Heerlen ?
• 1230 Hospital beds• 28.617 In patients• 18.696 Out patients • 435.984 Consultations
Pascal Stijns2008
Hospital Utility demands
HeatingCooling
ElectricitySteam
Various gasesVarious waters
Pascal Stijns2008
Tri-Gen Plant lay outC
entr
al H
eatin
g R
etur
n
Nat
.gas
Central Heating-Supply
Stea
m-S
uppl
y
3*Electrical Chiller
1100 kW
Coo
ling
Ret
urn
Coo
ling
Supp
ply
Emergency Cooling1000 kW
AbsorbtionChiller
1000/700 kW
CHP I1000/670 kW
CHP II1000/670 kW
Steam Boiler I 4650 kW
Steam Boiler II4650 kW
Hot WaterBoiler
4650 kW
CoolingTower1700 kW
Free Cooling300 kW
Pascal Stijns2008
Some pictures
Pascal Stijns2008
Annual variable energy cost (euros)
0
200
400
600
800
1000
1200
1400
1997 1998 1999 2000 2001
Year
Cos
t GasElectricityTotal
The challenge !1) Energy bill
2) Major expansion of the hospital capacity
3) Change in utility demands
4) Liberalisation of the energy market
5) Financial constraints (pay back and budget)
Pascal Stijns2008
The approach
1) Demand reduction ( building )
2) Generation optimisation ( utility )
• Demand modeling
• Physical Economical Model
• Model & Demand validation
• Scenario investigation and sensitivity analysis
• Select solutions
Pascal Stijns2008
Energy Study : Metering Data Collection
Pascal Stijns2008
Energy Study : Data Analysis
Pascal Stijns2008
Investigated Economical Solutions
• Smaller CoGen
• Smaller steam boiler
• Heat storage
• Cooling storage
• Variable speed drives
• Emergency Diesel Gen Sets
Didn’t passed financial or project/physical constraints in 2001
Pascal Stijns2008
Solution : Flue Gas Condenser
Heat recovery : 3.2 GWh(since september 2002-2007)Total heat demand : 67 GWh
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
Energy Plant Energy DemandEnergy Supply
? ?
0
500
1000
1500
2000
2500
3000
3500
2/01/2005 3/01/2005 4/01/2005 5/01/2005 6/01/2005 7/01/2005 8/01/2005 9/01/2
Pow
er (k
W)
Equipment efficiencies vary with load Heat / Electricity / Steam / CoolingGas en electricity (on/off peak)
Pascal Stijns2008
Economical Optimisation : Model
• MicroSoft Office based
• Physical properties add-ins
• Mathematical add-ins
• OLE/OPC
Pascal Stijns2008
Economical Optimisation : Demand Forecasting
Forecasted temperature data from Web
Historical demands/data
Pascal Stijns2008
Monthly Heat demand
Total Heat :13,246,264 kWh
Heerlen 2003 Actual versus Forecasted Heat Demand
0
500,000
1,000,000
1,500,000
2,000,000
2,500,000
Jan feb mar Apr May Jun Jul Aug Sep Oct Nov Dec
ActualHeat Forecasted Heat
Pascal Stijns2008
Monthly Cooling demand
Total Cooling :3,789,013 kWh
Heerlen 2003 Actual versus Forecasted Cooling Demand (kWh)
0
100,000
200,000
300,000
400,000
500,000
600,000
700,000
800,000
900,000
1,000,000
Jan feb mar Apr May Jun Jul Aug Sep Oct Nov Dec
Actual Cooling Forecasted Cooling
Pascal Stijns2008
Monthly Steam demand
Total Steam :3,007,116 kWh
Heerlen 2003 Actual versus Forecasted Steam Demand ( kWh)
0
50,000
100,000
150,000
200,000
250,000
300,000
350,000
Jan feb mar Apr May Jun Jul Aug Sep Oct Nov Dec
Actual Steam Forecasted Steam
Pascal Stijns2008
Monthly Electrical demand
Total Electrical :11,825,947 kWh
Heerlen 2003 Actual versus Forecasted Electricity Demand (kWh)
0
200,000
400,000
600,000
800,000
1,000,000
1,200,000
Jan feb mar Apr May Jun Jul Aug Sep Oct Nov Dec
Actual Electricity Forecasted Electricity
Pascal Stijns2008
Actual versus Forecasted Demand
Differences (%) :• Heat +0.9• Electricity +1.02• Cooling - 1.31• Steam - 0.14
0
2,000,000
4,000,000
6,000,000
8,000,000
10,000,000
12,000,000
14,000,000
Heat Electricity Cooling Steam
Heerlen 2003 Actual versus Forecasted demands
Actual Forecasted
Pascal Stijns2008
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”
Andre Dumont, Facility Manager
