Direct Normal Irradiance Measurements Using a Tracker-Less Sunshine Duration Measurement Concept
| Autor: | Pó, J.M., Hoogendijk, K., Chiba, I., Akiyama, A., Beuttell, W. |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: | |
| DOI: | 10.4229/35theupvsec20182018-6do.10.5 |
| Popis: | 35th European Photovoltaic Solar Energy Conference and Exhibition; 1676-1678 A new concept to measure the direct normal irradiance (DNI) is evaluated. While the state of the art setup to measure the DNI is comprised of a pyrheliometer assembled on a sun tracker, the EKO MS-90 measures DNI based on a sunshine duration concept which doesn’t require a tracker to align the sensor aperture with the sun disk, presenting a relatively low-cost solution to measure DNI. In this work, we present a study of the EKO MS-90 accuracy. We evaluate the sensor measurement error by comparing the DNI measurements with the output from a reference pyrheliometer assembled on a sun tracker. The preliminary results for clear sky conditions show deviations from the reference within ±5%, for solar zenith angles smaller than 75° and DNI values higher than 700 W/m2. Larger deviations practically within 10% are observed for greater angles and lower DNI values. |
| Databáze: | OpenAIRE |
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