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Performance Parameter Validation of ISO 9806 through Quasi-Dynamic and Steady-State Testing

This project aims to validate the performance parameters of Quasi-Dynamic (QD) and Steady-State (SS) Testing of ISO 9806 by conducting an additional single test sequence. The goal is to reduce deviation and testing time, resulting in a more efficient and cost-effective measurement procedure.

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Performance Parameter Validation of ISO 9806 through Quasi-Dynamic and Steady-State Testing

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  1. Project: SCF9 – ValiColl • Content: Participants: • Target • Methodology • Practical implementation • First results • Conclusion and outlook

  2. Target • Validation of performance parameters of Quasi-Dynamic (QD) and Steady-State (SS)-Testing of ISO 9806 by an additional single test sequenceexpected benefits:- reduction of the deviation of the performance parameter sets due to different influences (test institutes, locations, persons, etc.)- one day measurement for complaint procedure • Option to determine the whole set of parameters using only this method expected benefits:- reducingtesting time- reducingtestingexpenses

  3. Methodology • Principle:Power measurement of a collector day with high irradiation sum (not necessarily blue sky), increasing inlet temperature and evaluation of the energy balance for 3 sub-intervals and the total interval. • Requirements: • Measuring period 1 day from 1 h before sunrise to 1 hour after sunset • Irradiation sum: > 5 kWh/m² • Temperature range of inlet temperature from ambient to a max. temperature dependant on the heat loss categorie of the collector • Collector facing south, tilt angle adapted to have normal incidence at solar noon

  4. Practicalimplementationadaptationto different collectortypes

  5. Practicalimplementationfirstattemptbytestinstitute same collectortested in 3 different testlabsSS or QD + Validation sequence

  6. Practicalimplementationall validationsequences

  7. Data evaluation • Evaluation principle: Uniform data sets and comparison with simulation • 1. Validation of data sets of test institutes according to 12 validation sequences measurements • Measured values of the institutes converted to averaged minute values and related per m2 gross area • Negative collector output set to 0 • Post-simulation in minute steps with heat capacity C/A • Evaluation of the energy balance for different intervals:Interval 1: 04:00 to 08:00Interval 2: 08:00 to 10:30Interval 3: 10:30 to 12:30Interval 4: 12:30 to 17:00 • Evaluation of the relevant overall balance from 08:00 to 17:00 • 2. Determination of parameters sets from the 12 validation sequences • Post-simulation in minute steps using calculated heat capacity C/A of the Solar Keymark data sheet • Fit principle: <2% deviation between simulation and measurement in the intervals 2 to 4. Interval 1 was only considered qualitatively due to the low power and the associated larger measurement error. The deviation of the energy balance from 08:0 to 17:00 should be < 0.5 %. • Criterion for fit curve deviation: For the total interval, the sum of the absolute amounts of the deviations Measurement - Simulation was determined and minimized. • Determination of diffuse IAM kd:a) for general fit: calculated according to ISO 9806 (ScenoCalc) – not presentedb) for optimized general fit: selected (without calculation) for best possible fit

  8. Measuredresults - efficiency

  9. Measuredresults - efficiency

  10. Summary – energybalanceandperformanceparameter

  11. Summary IAM

  12. GraphicalassementVali-opt. Fit-a

  13. Graphicalassement SK

  14. GraphicalassementVali T1

  15. GraphicalassementVali T2

  16. GraphicalassementVali T3

  17. Conclusionandoutlook • Conclusion: • Though being different the determined parameter sets T 1 , T 2 and T 3 provide a good conformity concerning the annual collector output • A validation sequences shows deficits of the parameter fits so that the parameters can be improved • Days with higher diffuse radiation are fitted better with a higher diffuse IAM kd than the calculated one according to ISO 9806, the validation sequence can help to adjust kd and h0b • Based on two validation sequences one with few and one with more diffuse irradiation a parameter set can be found which has a similar precision like one with a QD or SS test. • Outlook: • There should be additional testing of collectors with biaxial IAM and lower losses. As there can be expected more difficulties to improve and fix the validation sequence • The institutes should simulate their measurements to cross check the results given • Based on the validation sequence there should be developed a method to for the complaint procedure. E.g. a max. allowed deviation of 5% less energy output in each sub interval 2, 3 and 4 at a minimum of 6,5 kWh/m2 irradiation could be the limit. • The method could be implemented in the ISO 9806 for QD and SS testing. • With more experience a shortened and cheaper collector testing could be developed especially when the performance parameters are roughly known. • Further investigations in a new SCF project could make sense!

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