1. Engine launching conference BRGM - Orleans 13. – 16.02.2006 Trigeneration with geothermal energy Potentials and pitfalls of combined supply with power, heating, and cooling S. Köhler 1, S. Kranz 1, A. Saadat 1, Felix Ziegler 2 1 GeoForschungsZentrum Potsdam (GFZ) 2 Technical University of Berlin (TUB)

2. Trigeneration with geothermal energy Temperature of the heat source 100 °C – 250 °C Limited capacity, depending on temperature and mass flow rate Products mPower mCooling mHeating mLarge office buildings mDistrict heating & cooling systems mAirports mIndoor pools / water parks Benefits mImprove exploitation mImprove cost-effectiveness mReduce environmental impacts

3. mPower plant mCooling station mHeating station Subsystems and their Components

4. mPower plant Subsystems and their Components

6. Base load mPower plant mAbsorption chiller Peak load mGrid mCompression chiller Subsystems and their Components

7. Base load mPower plant mAbsorption chiller mHeat exchanger m(Heat pump) Peak load mGrid mCompression chiller mFurnace Subsystems and their Components

8. Trigeneration from Fossil Fuel Simultaneous production of useful energies!

9. Coupling of the Subsystems Serial Not necessarily simultaneous production

10. Coupling of the Subsystems ParallelSubsystems compete

11. Coupling of the Subsystems Seasonal variation

12. Coupling of the Subsystems Simultaneous production! “Efficient Low Temperature Geothermal Binary Power” (LOW-BIN)

13. Heating and Power Examples mHusavik

14. Heating and Power Examples mAltheim

15. Heating and Power Examples mNeustadt-Glewe

16. Heating and Power mHusavik mAltheim mNeustadt-Glewe Examples Cooling mAlaska Ice Hotel (double lift absorption chiller) Trigeneration?

17. In search of the Optimum Design Potential mGeothermal äBase load energy äRenewable äPredictable mTrigeneration äPower (T brine > 120 °C) äCooling (T brine > 100 °C) äHeating Challenge mSubsystems compete mSubsystems interact mDistribution of geothermal heat is necessary äInstalled capacity (design) äTime (Controls) mConsider changes of mass flow rate or temperature of the brine mConsider technical and economical aspects

18. R&D Fields Supply mComponents äMaterials äHeat transfer äTurbo machinery mSubsystem äSpecific design requirements äSize of the single components äPart load behaviour mSystem äDesign äMeasuring and controls Demand mGeothermal is restricted to certain temperature ranges äArchitecture äDistrict heating / cooling system mLegal issues, administrative aspects