1. L. Guillaumea, A. Legrosa, V. Lemorta
Introduce your company logo here
THERMO-ECONOMIC OPTIMIZATION OF ORAGNIC RANKINE CYCLE SYSTEMS FOR WASTE HEAT RECOVERY FROM EXHAUST AND RECIRCULATED GASES OF HEAVY DUTY TRUCKS
L. Guillaumea, A. Legrosa, V. Lemorta
aDepartment of A&M, Thermodynamics laboratory, University of Liege, Belgium

2. Introduction ORC waste heat recovery Design:
Fuel consumption and CO2 emissions
Design:
Essential part of the design process
Library of steady-state models
Numerous steady-state models of different candidate ORCs
Design in three steps
Selection of the design conditions
Design (Optimization)
Evaluation of the off design performance
Thermodynamic vs thermo-economic optimization
Cost relations for all components
3rd EORC workshop, Belfast, 2016

3. Introduction Context
3rd EORC workshop, Belfast, 2016

4. Heat sources and heat sink
Temperature
Capacity flow rate
Exhaust gases
mid to high
high
EGR gases
low
Charge Air
low to mid
Coolant
Oil
3rd EORC workshop, Belfast, 2016

5. Expansion machines and working fluids
3rd EORC workshop, Belfast, 2016

6. Topologies
3rd EORC workshop, Belfast, 2016

7. Models of components Pump Model Expansion machine Model:
Semi empirical model
Fixed efficiencies
Expansion machine Model:
semi empirical model
Heat exchanger on the hot side
Tube and tube
Shell and tube
Plates
Heat exchanger on the cold side
Tube and tube
Shell and tube
Plates
3rd EORC workshop, Belfast, 2016

8. Validation of the models Heat exchangers
3rd EORC workshop, Belfast, 2016

9. Constraints and optimization variables
Economic constraints
Evaporating pressure
Mass of the heat exchangers
Pinch of the heat exchangers
Constraints for WHR
Built-in volume ratio
Temperature of the EGR
Heat rejection capacity
Technical constraints
Expander speed
Limited speed
Overheating degree
Limited inlet temperature
Gas mass fraction
3rd EORC workshop, Belfast, 2016

10. Selection of the design conditions
3rd EORC workshop, Belfast, 2016

11. Validation of the models Expansion machines
Simulation models for the volumetric expanders:
Calibration of the models on existing machines using experimental data.
References
Scaling of the parameters to adapt the models to the machine being currently designed (efficiencies).
Scaling relations applied to the model parameters
Model calibrated on a existing machine (reference)
Model of the machine being designed for the truck application
3rd EORC workshop, Belfast, 2016

12. Design Additional constraints
Expander technology
Scroll
Screw
Piston
Vane
Rotational speed [RPM]
<10000
<25000
<4000
Max. Inlet temperature [°C]
250 [2]
490 [3]
>500 [4]
<165
Built-in volume ratio [-]
4-5
6-14
2-4.5
Pressure ratio [-]
25 [5]
50 [6]
Same as in ICE
3rd EORC workshop, Belfast, 2016

13. Design Costs relations
Example for a piston expander
Assumptions
Swashplate
5 cylinders
Constant L/D ratio
3rd EORC workshop, Belfast, 2016

14. Design Thermo-economic optimization
3rd EORC workshop, Belfast, 2016

15. Design Thermo-economic optimization
Screw expander, topology 5 and ethanol
Net power output:
10.9 kW
Evaporating pressure:
19 bar
Condensing pressure:
1 bar
Rotational speed:
25 krpm (6.25 cm³)
Overheating degree:
48 °C
Built-in volume ratio: 6
3rd EORC workshop, Belfast, 2016

16. Off-Design Optimization
3rd EORC workshop, Belfast, 2016

17. Conclusion and perspectives
Help ORC designers to best select the expansion machine and working fluid for truck applications.
Preliminary design
Performance is not the only criteria
Decision array to select the components
Results are not general
Future work
Mixtures water/ethanol
Simulation of driving cycles
3rd EORC workshop, Belfast, 2016

18. Questions
Thank you
3rd EORC workshop, Belfast, 2016

19. Bibliography
Technico-economicsurveyofOrganicRankineCycle(ORC) systems S. Quoilin, M.VanDenBroek, S. Declaye, PierreDewallef, V.Lemort.
Experimental study and modeling of an Organic Rankine Cycle using scroll expander, S. Quoilin, V. Lemort, J. Lebrun.
Multi-objective optimization of organic Rankine cycles for waste heat recovery: Application in an offshore platform L. Pierobon, T. Van Nguyen, U. Larsen, F. Haglind, Brian Elmegaard.
European comission, Energy 2020, en-ergy2020/energy2020.htm 2013.
3rd EORC workshop, Belfast, 2016

20. Appendix Limit on the EGR temperature
3rd EORC workshop, Belfast, 2016