Performance parameters of solar collectors - Validation and determination by a one-day measurement

摘要

The current version of ISO 9806 has merged the two test methods steady-state (SS) and quasi-dynamic (QD) in such a way, that now only one uniform formula is used to determine the collector performance. However, the individual methods remained almost unchanged. The various test methods often result in parameter sets being determined for the same collector that differ significantly from one another. With the help of a one-day validation measurement, the results can be made more precise and standardized. There is also the option of determining the complete parameter set with this single validation sequence under suitable conditions. On vice-versa, it is possible with validated parameters to predict or simulate daily yields in the complete temperature application range of a collector more precisely. Thus, solar thermal industry can make professional and reliable statements about yields, e.g. of large solar systems, beyond the mere determination of peak performance on the basis of a one-day yield check of performance.