Quarter strategy meeting

1. Quarter strategy meeting 31stMay 2019 Gabriele Humbert

2. OUTLINE • Whatis SMART? • Researchoutputs & thesisassembly • Skillsdevelopment • SWOT analysis

3. S.M.A.R.T. philosofy The establishing of allobjectivesshould be createdusing a S.M.A.R.T. philosophy: Specific: whatis to be done? Measurable: howwillyouknowitmeetsexpectations? Achievable: can I do it? Relevant: shouldit be done? Time-Oriented: whenitwill be done?

4. Specific: whatis to be done? Broaderpicture: • Produce relevantscientificresults; • Identify a narrative for formythesis; • To developedresearch and personal skills. To achievethese major goals, planning isessential.

5. Target identification • Researchquestions must be found and addressed. • My first researchquestionwill be: can the design of thermochemicalsorptionenergystorage be improved by topologyoptimization?[1] How? [1] Topology optimisation of biphasic adsorbent beds for gas storage, Amigo et Al., 2018

6. Relevant: TCES design challenges[1] • Improving of the adsorbent bed geometry; • Control of heatcapacity; • Improving of heat transfer; • Improving of mass transfer; • … [2] Hierarchyconcepts: zeolytecontainingmaterials, Schewieger et Al., 2016 [1] Sorption thermal storage for solar energy, Yu et Al., 2013

7. Heat and mass transfer enhancement [1] Ammonia Ab- and Desorption in SrCl2 for Application in Thermochemical Storage System for Waste Heat Recovery Karabanova et. Al., EUROTHERM 2019 [2] Thermochemical process for seasonal storage of solar energy: Characterization and modeling of a high density reactive bed, Benoit M. et Al, 2012

8. Researchoutputs & thesisassembly

9. Whatis to be done? Nextquarterstrategy: • The nextproblems to address are: - Steady-state simplifiedsorptionphenomena. - Top Opt for transientphenomena; Mainobjective of nextmonths work!

10. TO transientphenomena • Evaluation and storing of the sensitivityateach time-step from COMSOL and thenintegratingthembackward in time to solve the Adjointproblem in MATLAB. • Can the Sensitivity from COMSOL be calculatedateachtimestep? MidJune

11. Finaladjoint The system can be solve by backwardsubsitution: For n= The discrete sensitivityfieldiscalculated: Matlab script: End of August

12. Simplifiedadsorptionphenomena • Pressure drivenvelocity:Darcy’s law; • Isothermalreactor (no energyequation); • Steady-State; • Rate of reaction: linear function of vapourconcentration. • NavierStokes for fluiddynamics; • Isothermalreactor (no energyequation); • Steady-State; • Rate of reaction: linear function of vapourconcentration. =

13. Steady-state Sorptionphenomena: Modelingstrategy • 2D geometry. • Mass transfer modeling; • COMSOL implementation and verification; • TO of mass transfer in simplifiedsorptionphenomena; • Heat and mass transfer modeling; • COMSOL implementation and verification; • TO of heat&masstransfer in simplifiedsorptionphenomena; MidJune MidJune End June MidJuly MidJuly End August

14. Researchskills

15. Knowledge base Subjectknowledge & code language:hands-on the script can help to increase the TO algorithmaspectsand to increase the knowledge of the in-house MATALB code language; Problemsolving: Isolates basic themes of own research  how to split the script in sub-problems? Cognitive abilities Perseverance: Demonstrates self-discipline, deal effectively with the routine aspects of research. Personal qualities Time management: Establishing my own time-management system, responds on flexibility. Self management

16. Parallelideas/projects

17. Sensibleheatstorage:steady state approximation B.C. : Transient TO needed!

18. Complex-fluids HE: Modelingstrategy • 2D geometry. • Heat transfer; • Newtonian laminar flow; • Heattransfer + newtonian laminar flow; • Non-Newtonian laminar flow; • Heat transfer + Non-Newtonian/supercritical laminar flow.

19. SWOT analysis

20. SStrength WWeakness O Opportunities Limited comprehension about the MATLAB code; Still not able to solve TO for transient phenomena; Lack of network in the Top Opt aspects; Continuation scheme formulation. Research priorities for the next months are clear; The TO tool works well, the wiki is well written; Improved knowledge about the use of the TO tool and possible applications/limits. Plenty of expertise in the thermochemical energy storage field in ChemEng; Other research groups working in Top Opt; A lot of possibilities for thermochemical energy storage design improvement.

21. Needs • Can I talk with the guywhosaid COMSOL can compute sensitivities in time? • Isthereanyoneworking with the TO tool? e.g. Behrou’sgroup • Networking in TO, butthis can be doneafterhaving some reuslts.

22. THANKS

23. The Brinkman friction term F(s)=-α(s)uis introduced to penalize fluid velocities in the solid material (α is impermeability). F assumes large values in the solid region. To further penalize convective heat transfer in the solid region Material interpolation for the thermal conductivity k(s) and volumetric heat generation q(s)

24. Sensitivityanalysis • Total residual vector; • Generic state variable; • Vector of adjoint variables; = qjis a genericoptimizationcriterion Matrix: () x () The sparsity pattern depends on the schemeadopted! number of time steps; number degrees of freedom

25. Hp. ImplicitEulerscheme (unconditionallystable)  lowerbidiagonalmatrix: