ASTM E 781 Standard Practice for Evaluating Absorptive Solar Receiver Materials When Exposed to Conditions Simulating Stagnation in Solar Collectors with Cover Plates
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ASTM E 781 Document Information:
Title
Standard Practice for Evaluating Absorptive Solar Receiver Materials When Exposed to Conditions Simulating Stagnation in Solar Collectors with Cover Plates
ASTM International
Publication Date:
Jun 9, 1986
Scope:
This practice covers a test procedure for evaluating absorptive solar
receiver materials and
coatings when exposed to sunlight under cover plate(s) for long
durations. This practice is
intended to evaluate the exposure resistance of absorber materials and
coatings used in flat-plate
collectors where maximum nonoperational stagnation temperatures will
be approximately 200°C
(392°F).
This practice shall not apply to receiver materials used in solar
collectors without covers
(unglazed) or in evacuated collectors, that is, those that use a
vacuum to suppress convective and
conductive thermal losses.
The values stated in SI units are to be regarded as the standard.
This standard does not purport to address all of the safety concerns,
if any, associated with its
use. It is the responsibility of the user of this standard to
establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use.
Keywords:
- absorber
- absorptance
- aging
- cover plates
- emittance
- outdoor weathering
- selective absorber
- solar collectors
- stagnation
- thermal testing
- weathering
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