Evaluation of the Uncertainty of Surface Temperature Measurements in Photovoltaic Modules in Outdoor Operation

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2022-08Department
Ingeniería EléctricaSource
Sensors (Basel, Switzerland), Vol. 22, Núm. 15Abstract
Faults in photovoltaic modules in operation can lead to power losses. By determining the
module surface temperature, hot spots that can potentially cause this power loss can be detected.
Temperature measurement by radiation allows a complete, reliable, and fast qualitative determination
of hot spots on PV modules in outdoor operation. However, to obtain quantitative values,
it is necessary to consider multiple factors: emissivity, reflected radiation, wind speed, intensity,
shading, etc. Temperature quantitative measurement evaluation by contact is more studied, although
by this technique it is impossible to examine the temperature of the entire module to detect hot spots
because it is a point measurement and due to shading caused by the measurement probe on the
surface. In this work, a method of temperature measurement by radiation is described, evaluating the
uncertainty components, and a comparison is made with temperature measurement by contact on
the module rear side points where module heating has been detected, also evaluating the uncertainty
components. This comparison of both methods and uncertainty determination allows establishing
a methodology in quantitative temperature measurement by radiation in photovoltaic modules in
outdoor operation.