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Enhancing Hydrogen Storage Systems for Automotive Efficiency

Explore key strategies and procedures to enhance efficiency and safety of hydrogen storage systems for automotive applications. Discuss probabilistic design, quantitative procedures, and test protocols. Delve into autofrettage process and risk assessment.

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Enhancing Hydrogen Storage Systems for Automotive Efficiency

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  1. STORHY – Hydrogen Storage Systemsfor Automotive Applications26th September 2005EU-HarmonHy Workshop; Brussels Author: Volker Strubel

  2. I. Increasing of efficiency: Crosscutting of RCS II. Needs for StorHy-System improvement II. ECE-H2 draft:Comments on several test procedures IV. Aspects of QM during autofrettage V. Conclusions (RCS in the 7th FP). Highlights of SP SAR within StorHySurvey - Crosscutting of RCS - StorHy-System improvement – Comments on several test procedures - QM during autofrettage - Conclusions Highlights of SP SAR within StorHy Georg W. MairBAM-III.2

  3. Highlights of SP SAR within StorHySurvey - Crosscutting of RCS - StorHy-System improvement – Comments on several test procedures - QM during autofrettage - Conclusions Increasing of efficiency: Crosscutting of RCS Application Components Table will be explained in detail by Mr. Krainz Knowledge, results of pre-normative research and standards should be discussed in a more spanning way to avoid duplication of work.

  4. Highlights of SP SAR within StorHySurvey - Crosscutting of RCS - StorHy-System improvement – Comments on several test procedures - QM during autofrettage - Conclusions Currently the StorHy-Systems are primarily designed to fulfil the standards and not a certain level of reliability. So an improvement of e. g. the Hydrogen storage technology is possible by an probabilistic opening of the required test regimes: • to achieve a lower weight, • to achieve a decrease of material consumption, • to achieve a cheaper manufacturing process…. …at a safety level which is on no account lower than today.

  5. Highlights of SP SAR within StorHySurvey - Crosscutting of RCS - StorHy-System improvement – Comments on several test procedures - QM during autofrettage - Conclusions A set of probabilistic optimised design parameters e. g. of a hoop wrapped Type II cylinder shows… …a wide spread ofsafety factors linked to weight.

  6. Highlights of SP SAR within StorHySurvey - Crosscutting of RCS - StorHy-System improvement – Comments on several test procedures - QM during autofrettage - Conclusions The comparison with the main optimisation restriction shows that the wide spread of safety factors does not correlate with the constant safety level… …so a deterministic safety factor does not trustworthily show a certain safety level.

  7. Highlights of SP SAR within StorHySurvey - Crosscutting of RCS - StorHy-System improvement – Comments on several test procedures - QM during autofrettage - Conclusions The necessary opening of the type test requirements may not be done by a discussion of e. g. stress ratios, life time or burst pressure separately! Its high time to use probabilistic tools for the assessment of such changes and to assess the current safety level in a quantitative manner. The probabilistic is the only method to achieve a further improvement of high pressure containments without taking a hazardous risks.

  8. Highlights of SP SAR within StorHySurvey - Crosscutting of RCS - StorHy-System improvement – Comments on several test procedures - QM during autofrettage - Conclusions A possible quantitative procedure which is going to be assessed within StorHy is: to perform the fatigue test at –40°C until leakage (Typ II) Requirement:load cycles before leakage

  9. Highlights of SP SAR within StorHySurvey - Crosscutting of RCS - StorHy-System improvement – Comments on several test procedures - QM during autofrettage - Conclusions An other possible quantitative procedure which is going to be assessed within StorHy is: to perform the “bonfire test” of Hydrogen containments until rupture and separately for PRD and cylinders Requirement:bursting time and pressure

  10. Highlights of SP SAR within StorHySurvey - Crosscutting of RCS - StorHy-System improvement – Comments on several test procedures - QM during autofrettage - Conclusions An other possible quantitative procedure which is going to be assessed within StorHy is: to perform the “drop test” dependent on statistic crash data and chassis properties Requirement:max. of energy without gas release

  11. Highlights of SP SAR within StorHySurvey - Crosscutting of RCS - StorHy-System improvement – Comments on several test procedures - QM during autofrettage - Conclusions An important part of the manufacturing process of containments with a load sharing liner is the autofrettage process:

  12. Highlights of SP SAR within StorHySurvey - Crosscutting of RCS - StorHy-System improvement – Comments on several test procedures - QM during autofrettage - Conclusions The material caused wide spread of results after autofrettage process shows the necessity of the combination of quanti-tative type test procedures and the evaluation of the manufactured products.

  13. Highlights of SP SAR within StorHySurvey - Crosscutting of RCS - StorHy-System improvement – Comments on several test procedures - QM during autofrettage - Conclusions • There is a high pressure and an enormous potential for design improvements without a decrease of safety level. • Therefore its necessary to improve the design type testing procedures to achieve quantitative assessable tests and related testing techniques/apparatus (7th FP?). • Further effort of assessment of the current safety level in terms of probability should be made (7th FP?). • An alternative probability based design type approval should be developed (7th FP?). • For an adequate good product safety it is necessary to develop appropriate and effective QM procedures.

  14. Thank you for your attention

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