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Performance Assessment of an Integrated Sensor for Simultaneous Measurements of Global and Diffuse Radiation Components at Athens Area

  • B. Psiloglou
  • S. Lykoudis
  • D. Kouvas
Conference paper
Part of the Springer Atmospheric Sciences book series (SPRINGERATMO)

Abstract

The proper design of installations utilizing solar radiation requires the accurate knowledge of solar radiation availability on horizontal and tilted surfaces as well as its direct/total and diffuse components. The measurement of diffuse radiation normally requires a sun tracking or shading device. However, a new integrated instrument, model SPN1, has been presented by Delta-T Devices, incorporating seven miniature thermopile sensors, a built-in microprocessor, and an internal shading device with no moving parts. SPN1 sensor is able to perform simultaneously measurements of both the global and diffuse solar radiation reaching a horizontal surface and can also estimate sunshine duration. Such a sensor was installed at NOA’s actinometric station at Penteli site, during summer 2011, to assess its performance against classic measurements of global irradiance by thermopile pyranometer and diffuse with a shading ring. Stated accuracies are easily verified for 1-min measurements of total solar radiation, with RMSE values varying between 2.6% and 3.6%, whereas for the diffuse radiation, stated accuracies were not possible to verify, with RMSE values varying between 10.8% and 17.0%. This may be due to measurement inaccuracies, yet for the diffuse component there might be a need for a correction factor to improve accuracies.

Notes

Acknowledgments

Special thanks to Delta-T Devices Ltd. UK for lending us the SPN1 sensor for testing and comparison with classical thermopile sensors.

References

  1. CIE (1994) Guide to recommended practice of daylight measurement. No. 108, Vienna, AustriaGoogle Scholar
  2. Delta-T Devices Ltd (2001) BF2 and BF3 optical design. Available from www.delta-t.co.uk
  3. Delta-T Devices Ltd (2007) User manual for the Sunshine pyranometer type SPN1. Available from www.delta-t.co.uk
  4. Kipp & Zonen (2004) CM121 Shadow Ring instruction manual. Ver. 0706, DelftGoogle Scholar
  5. Wilcox SM, Myers DR (2008) Evaluation of radiometers in full-time use at the National Renewable Energy Laboratory Solar Radiation Research Laboratory. Technical report NREL/TP-550-44627Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  1. 1.Institute for Environmental Research and Sustainable DevelopmentNational Observatory of AthensAthensGreece
  2. 2.ScientAct S.A.ThessalonikiGreece

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