Zo, Ilsung
(Research Institute for Radiation-Satellite, Gangneung-Wonju National University)
,
Jee, Joonbum
(Weather Information Service Engine, Hankuk University of Foreign Studies)
,
Kim, Buyo
(Research Institute for Radiation-Satellite, Gangneung-Wonju National University)
,
Lee, Kyutae
(Research Institute for Radiation-Satellite, Gangneung-Wonju National University)
Solar radiation data measured by pyranometers is of fundamental use in various fields. In the field of atmospheric optics, the measurement of solar energy must be precise, and the equipment needs to be maintained frequently. However, there seem to be many errors with the existing type of pyranometer...
Solar radiation data measured by pyranometers is of fundamental use in various fields. In the field of atmospheric optics, the measurement of solar energy must be precise, and the equipment needs to be maintained frequently. However, there seem to be many errors with the existing type of pyranometer, which is an element of the solar-energy observation apparatus. In particular, the error caused by the thermal dome effect occurs because of the thermal offset generated from a temperature difference between outer dome and inner casing. To resolve the thermal dome effect, intensive observation was conducted using the method and instrument designed by Ji and Tsay. The characteristics of the observed global solar radiation were analyzed by classifying the observation period into clear, cloudy, and rainy cases. For the clear-weather case, the temperature difference between the pyranometer's case and dome was highest, and the thermal dome effect was $0.88MJ\;m^{-2}\;day^{-1}$. Meanwhile, the thermal dome effect in the cloudy case was $0.69MJ\;m^{-2}\;day^{-1}$, because the reduced global solar radiation thus reduced the temperature difference between case and dome. In addition, the rainy case had the smallest temperature difference of $0.21MJ\;m^{-2}\;day^{-1}$. The quantification of this thermal dome effect with respect to the daily accumulated global solar radiation gives calculated errors in the cloudy, rainy, and clear cases of 6.53%, 6.38%, and 5.41% respectively.
Solar radiation data measured by pyranometers is of fundamental use in various fields. In the field of atmospheric optics, the measurement of solar energy must be precise, and the equipment needs to be maintained frequently. However, there seem to be many errors with the existing type of pyranometer, which is an element of the solar-energy observation apparatus. In particular, the error caused by the thermal dome effect occurs because of the thermal offset generated from a temperature difference between outer dome and inner casing. To resolve the thermal dome effect, intensive observation was conducted using the method and instrument designed by Ji and Tsay. The characteristics of the observed global solar radiation were analyzed by classifying the observation period into clear, cloudy, and rainy cases. For the clear-weather case, the temperature difference between the pyranometer's case and dome was highest, and the thermal dome effect was $0.88MJ\;m^{-2}\;day^{-1}$. Meanwhile, the thermal dome effect in the cloudy case was $0.69MJ\;m^{-2}\;day^{-1}$, because the reduced global solar radiation thus reduced the temperature difference between case and dome. In addition, the rainy case had the smallest temperature difference of $0.21MJ\;m^{-2}\;day^{-1}$. The quantification of this thermal dome effect with respect to the daily accumulated global solar radiation gives calculated errors in the cloudy, rainy, and clear cases of 6.53%, 6.38%, and 5.41% respectively.
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제안 방법
However, studies are still being conducted to solve the problems related to thermal offset, owing to the temperature difference between case and dome. In this study, intensive observations were performed and the TDE was analyzed using the Ji and Tsay (2010) method [20] and a modified pyranometer at Gangneung-Wonju National University, in collaboration with NASA. The analysis involved classifying the observation period into clear, cloudy, and rainy cases using observations of the total cloud amount.
In this study, intensive observations were performed and the TDE was analyzed using the Ji and Tsay (2010) method [20] and a modified pyranometer at Gangneung-Wonju National University, in collaboration with NASA. The analysis involved classifying the observation period into clear, cloudy, and rainy cases using observations of the total cloud amount. The difference between Tc and Td was large for clear days, leading to an increase of the TDE, and a value of 0.
The global solar radiation was observed using the modified pyranometer (PSP, EPPLEY), while the direct and diffuse solar radiation were observed at 1 minute intervals using the Kipp & Zonen instrument (direct: CHP1, diffuse: CMP 21, sun-tracker: 2AP).
이론/모형
Smith [11] directly attached a temperature sensor to the dome to observe Td, but because this can cause an error in the pyranometer’s measurements, the Ji and Tsay method was used in this study.
This study used a modified Eppley PSP (Precision Spectral Pyranometer) device, as illustrated in Fig. 1. The c and f values of the modified pyranometer required for Eq.
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