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Durability Testing of Parabolic Trough Receivers – Overheating, Thermal Cycling, bellow Fatigue and Antireflex-Coating Abrasion

Authors: orcid bw Pernpeintner, Johannes;
Pernpeintner, Johannes
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Pernpeintner, Johannes in OpenAIRE
orcid bw Sutter, Florian;
Sutter, Florian
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Sutter, Florian in OpenAIRE
Happich, Christoph; orcid bw Lüpfert, Eckhard;
Lüpfert, Eckhard
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Lüpfert, Eckhard in OpenAIRE
orcid bw Schiricke, Björn;
Schiricke, Björn
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Schiricke, Björn in OpenAIRE
Lichtenthäler, Niels; Thoss, Johannes; +1 Authors

Durability Testing of Parabolic Trough Receivers – Overheating, Thermal Cycling, bellow Fatigue and Antireflex-Coating Abrasion

Abstract

AbstractThis paper describes accelerated aging tests on parabolic trough receivers. Overheating of parabolic trough receivers about 80-100K over the nominal operating temperature is applied for accelerated aging of the absorber coating.A lifetime prediction based on the Arrhenius parameters requires extensive testing; A reduced test with heating receivers to 478°C for 1000hours is applied on receivers for oil fluid in order to compare heat loss and optical efficiency before and after such accelerated aging. In a further test set, such receivers are thermally cycled between 200°C and 478°C for 100 times. A bellow fatigue test has been developed for testing of the bellows stability for the compression and expansion. Receivers are subjected to 20,000 cycles and rested for a 24 hour waiting period. The receiver heat loss during the bellow fatigue test shall not increase more than 30%. Durability of the antireflex coating on the glass is tested with the Taber linear abrasor using the CS-10F rubber (¾”) and MIL 12397 Eraser (¼”). Both abrasive materials proved to be suited to obtain reproducible results, although the discussion is still ongoing on which material should be used. The larger diameter of the CS-10F rubber offers the advantage that transmittance measurement with the Lambda 950/1050 spectrophotometer can be performed without the necessity for multiple abrading stripes.

Country
Germany
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Keywords

paraboilc trough receiver, bellow fatigue, Qualifizierung, AR-coating, Energy(all), thermal cycling, abrasion, accelerated aging, overheating

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