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Assessment and improvement of thermoelectric pyranometer measurements

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conference contribution
posted on 30.10.2019, 15:05 by Francesco Mariottini, Giorgio Belluardo, Martin BlissMartin Bliss, Patrick IsherwoodPatrick Isherwood, Ian R. Cole, Tom BettsTom Betts
This work evaluates the variability of thermoelectric pyranometer calibration values seen when using different calibration methods and practices. The pyranometer calibration ISO 9847:1992 standard leaves many procedural details to the user’s discretion. The variability resulting from different interpretations influences PV system performance monitoring and energy yield modelling. Improved methods and more robust standardisation are therefore needed to reduce uncertainty in field-deployed thermoelectric pyranometers and consequently reduce risk in PV system energy yield assessment. This paper investigates the variability induced by relaxed calibration procedures defined in the standard Furthermore, it proposes indoor procedures for the characterisation of pyranometer response to incidence angle and temperature which have not yet been defined in the standards. Uncertainty of calibration factors including under high angles of incidence and a few cloudy data series from outdoor methods were found to be up to 2.08%, compared with 1.4% stated by the manufacturer. Uncertainty increases up to 4.73% when reference and test sensors are of different types. Results of indoor calibration procedures agreed to within 1.21% even when calibrating multiple sensors at the same time. The instability of the irradiance source contributed more to the overall uncertainty than the selection of the procedure. The angular response of the devices tested was close to the prescribed limits [1].

Funding

European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 721452

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Research Unit

  • Centre for Renewable Energy Systems Technology (CREST)

Published in

Proceedings of the 36th EU PVSEC 2019

Pages

1388 - 1391

Source

36th European Photovoltaic Solar Energy Conference and Exhibition

Publisher

WIP

Version

AM (Accepted Manuscript)

Acceptance date

13/09/2019

Publication date

2019-10-24

ISBN

3936338604

ISSN

2196-100X

Language

en

Location

Marseille, France

Event dates

9th September 2019 - 13th September 2019

Depositor

Dr Martin Bliss. Deposit date: 28 October 2019

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