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Report Revision of the special test procedure for collectors

This report discusses the revision of the special test procedure for collectors in the Solar Keymark Scheme. It addresses the limitations of the "10% rule" and proposes the use of the Solar Keymark Data Sheet approach for assessing collector yield. The report also outlines the acceptance criteria to be used in the retesting process.

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Report Revision of the special test procedure for collectors

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  1. Report Revision of the special test procedure for collectors 26thSolar Keymark Network Meeting, March 05 – 06, 2019, Stockholm Stephan Fischer

  2. 1/3 Background The so called "10 % rule" described in the Solar Keymark Scheme Rule in section 6.3 Special test, 6.3.1 Compliance with registered values Collectors (EN 12975): “The integral of the measured instantaneous efficiency at the special test shall be more than 90% of the already registered integral in the interval of the reduced temperature from 0 – 0,1 K/(W/m²). The reduced temperature is defined in EN 12975-2, paragraph 6.1.4.8.3, and the instantaneous efficiency in 6.1.4.8.4.2.” Stephan Fischer

  3. 2/3 Background Stephan Fischer

  4. 3/3 Background • "10 % rule" not appropriate due to the following reasons: • threshold of 10 % is too high to be applied successfully on doubtful results • criteria of the instantaneous efficiency does not take into account the incidence angel modifier and thus does not give a complete picture of the thermal performance of the collector Stephan Fischer

  5. Using Solar Keymark Data Sheet Approach • Use of the collector yield documented on the second page of the Solar Keymark data sheet for different mean temperatures and locations. Stephan Fischer

  6. Based on Solar Keymark Data Sheet page 2 Acceptance Criteria to be used in the process In case the following requirements (based on the results of the QAiST Round Robin plus a “savety buffer”) are fulfilled for a retested collector the already registered values stay valid: “the annual collector output at Athens, Davos, Stockholm and Würzburg at a mean fluid temperature 25 °C shall exceed 94% of the already registered values and the annual collector output at Athens, Davos, Stockholm and Würzburg at a mean fluid temperature 50 °C shall exceed 91% of the already registered values and the annual collector output at Athens, Davos, Stockholm and Würzburg at a mean fluid temperature 75 °C shall exceed 84% of the already registered values” Stephan Fischer

  7. Ensure impartiality / Check if collectors are identical Step 1+2 Remarks: 1: Establishment of third party team according to section 2.2.3 Solar Keymark Specific Scheme rules Version 31. 2: Check based on documents or physical collectors 5: Costs have to been borne by the Keymarklicenceholder of the product in question 1 Establish third party team 3 Identical? 2 Check if collector is identical with collector in question no 4 Retest 5 New values valid yes end A Stephan Fischer

  8. Check plausibility Step 3 Remarks: 6: Check based on technical specification, test report and data sheet 7: decision must be with a 2/3 majority within third party team 10: Costs have to been borne by the legal person holding the Keymarklicence of the product in question 11: Costs have to been borne by complainant Stephan Fischer

  9. Next steps • Finalise document and proposal for resolution • Send out for vote by correspondence Stephan Fischer

  10. Stephan Fischer 63231 stephan.fischer@igte.uni-stuttgart.de Report Revision of the special test procedure for collectors

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