Long-term Behavior, Accuracy and Drift of LI-200 Pyranometers as Radiation Sensors in Rotating Shadowband Irradiometers (RSI)

Geuder, Norbert; Affolter, Roman; Kraas, Birk; Wilbert, Stefan

doi:10.1016/j.egypro.2014.03.247

Cited by 22 publications

(19 citation statements)

References 5 publications

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“…The light quality differs from that during calibration and solar zenith angle correction would not be needed under cloudy conditions. Various corrections have been applied to SiPs to compensate for effects of temperature, spectral sensitivity, and cosine error in rotating shadow band applications (Geuder et al 2014;Vignola et al 2016;Al-Rasheedi et al 2018). Perhaps, these approaches could be adapted in the future to serve in a "smart" calibration, where the fractions of direct and diffuse radiation are known and utilized in the calibration and application.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, diffuse irradiance differs spectrally from direct irradiance from the sun, such that SiPs measuring diffuse irradiance respond differently under a cloudless sky than under skies covered with clouds (Vignola et al 2016). Various corrections have been applied to SiPs to compensate for the effects of temperature, spectral sensitivity, and cosine error, especially when used in rotating shadow band applications (Geuder et al 2014;Vignola et al 2016;Al-Rasheedi et al 2018). Thus, it is ideal to calibrate SiPs on site during periods of atmospheric conditions representative of conditions that occur during the entire year.…”

Section: Introductionmentioning

confidence: 99%

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Improving the calibration of silicon photodiode pyranometers

Walter‐Shea

Hubbard

Mesarch

et al. 2018

Meteorol Atmos Phys

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Reliable measurements of global irradiance are essential for research and practical applications. Silicon photodiode pyranometers (SiPs) offer low-cost sensors to measure direct and diffuse irradiance despite their non-uniform spectral response over the 300-1000 nm spectral range. In this study, non-adjusted linear and adjusted calibrations were applied at different times of the year to determine sources of estimated errors in global irradiance due to the two calibration approaches, calibration time, and sensor age. 16 SiPs, along with two standards, measured incident global irradiance over a 5-year period under a range of sky conditions. Sensors performed best in the months in which they were calibrated when using the linear calibration approach. With the solar zenith angle adjusted calibration approach, certain calibration months provide a defendable validation for the following 12 months [ranging an average of 13.5-17.4 W m −2 standard error (SE)], while other calibration months do not provide consistent results and sometimes result in very poor validation (31.1-242.7 W m −2 SE). Older sensors (greater than 6 years) in general become more sensitive to solar zenith angle and their response drifts over time, while newer SiPs performed better than older sensors. Calibrations which accounted for solar zenith angle effects improved global irradiance estimates for older SiPs. For the Lincoln NE location, the appropriate calibration is in spring or late summer, regardless of calibration approach. These results indicate that solar zenith angle correction is not needed for largely diffuse components under cloudy conditions, so that in the future, a "smart" calibration may be possible, where diffuse radiation fractions are known. digitalcommons.unl.edu W a l t e r -S h e a i n M e t e o r o l o g y a n d A t m o s p h e r i c P h y s i c s( 2 0 1 8 ) 2

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improving the calibration of silicon photodiode pyranometers

Walter‐Shea

Hubbard

Mesarch

et al. 2018

Meteorol Atmos Phys

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“…Calibrations of 180 days duration or more on the other hand are too time-consuming in practice, especially considering the recommended frequency of recalibration of 2 years given in Geuder et al (2014). Another disadvantage of very long-term calibrations is the lag time.…”

Section: Evaluation Results For the Methods Dlr2008mentioning

confidence: 99%

“…A first site-specific assessment of the necessary calibration duration at PSA has been presented in Geuder et al (2014) in which a minimum measuring period of 30 days was recommended based on data collected from a single instrument. We investigated the subject further by use of a total of seven long-term data sets ranging from 251 to 1289 day duration collected over a period of 6.5 years from five RSI instruments (Table 5).…”

Section: Evaluation Of Rsi Calibration Duration and Seasonal Influencesmentioning

confidence: 99%

Calibration methods for rotating shadowband irradiometers and optimizing the calibration duration

Jessen

Wilbert²,

Nouri³

et al. 2016

Atmos. Meas. Tech.

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Abstract. Resource assessment for concentrated solar power (CSP) needs accurate direct normal irradiance (DNI) measurements. An option for such measurement campaigns is the use of thoroughly calibrated rotating shadowband irradiometers (RSIs). Calibration of RSIs and Si-sensors is complex because of the inhomogeneous spectral response of these sensors and incorporates the use of several correction functions. One calibration for a given atmospheric condition and air mass might not be suitable under different conditions. This paper covers procedures and requirements of two calibration methods for the calibration of rotating shadowband irradiometers. The necessary duration of acquisition of test measurements is examined with regard to the site-specific conditions at Plataforma Solar de Almería (PSA) in Spain. Seven data sets of long-term test measurements were collected. For each data set, calibration results of varying durations were compared to its respective long-term result. Our findings show that seasonal changes of environmental conditions are causing small but noticeable fluctuation of calibration results. Calibration results within certain periods (i.e. November to January and April to May) show a higher likelihood of deviation. These effects can partially be attenuated by including more measurements from outside these periods.Consequently, the duration of calibrations at PSA can now be selected depending on the time of year in which measurements commence.

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“…Such a device basically consists of two main parts (see Fig. 10, right): a single photodiode sensor placed horizontally and a small motor-activated shadowband rapidly rotating around the sensor at regular intervals, thus intermittently blocking the direct radiation component from the sensor [24,100]. The global and diffuse irradiances are determined from the unshaded and shaded sensor response, respectively, and the direct irradiance is ultimately calculated at each instant by difference using Eq.…”

Section: Specific Considerations For Solar Resource Assessmentmentioning

confidence: 99%

Solar Resource for High-Concentrator Photovoltaic Applications

Ruiz‐Arias

Gueymard²

2015

High Concentrator Photovoltaics

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Direct solar radiation is the main fuel for concentrating photovoltaic (CPV) technologies. At any instant, the magnitude and spectral distribution of incoming direct normal irradiance (DNI) on the concentrator determines the instantaneous power produced by the generator. On a seasonal or mean annual basis, the magnitude of the DNI resource also directly affects the design of the whole system. Therefore, detailed knowledge of the available solar resourceessentially in terms of broadband DNI-is required at the system's design stage to evaluate the anticipated power to be produced by the projected CPV plant. This chapter is devoted to providing a better understanding of the current methods used in solar resource assessment to accommodate the specific needs of CPV projects. To this aim, the chapter starts with an introductory discussion on extraterrestrial solar radiation and its transfer throughout the Earth's atmosphere. Later on, the most common solar radiation modelling approaches for solar energy applications are discussed preceding a brief review of the best current measuring techniques and data quality-control methods for solar radiation. This includes important measurement recommendations for CPV applications. The chapter ends with brief discussions on spectral and circumsolar solar radiation.

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Long-term Behavior, Accuracy and Drift of LI-200 Pyranometers as Radiation Sensors in Rotating Shadowband Irradiometers (RSI)

Cited by 22 publications

References 5 publications

Improving the calibration of silicon photodiode pyranometers

Improving the calibration of silicon photodiode pyranometers

Calibration methods for rotating shadowband irradiometers and optimizing the calibration duration

Solar Resource for High-Concentrator Photovoltaic Applications

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