Calculating Heat Transfer of Photovoltaic Panels

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To calculate the heat transfer of a photovoltaic panel composed of different materials, one can utilize the concept of a composite plane wall, focusing on the thermal conductivity values of each material. The overall heat transfer coefficient can be determined by considering the thermal resistances of each layer, rather than using a single thermal conductivity value for the entire panel. When the panel is placed over a flowing water source, convective heat transfer must also be accounted for, in addition to conductive heat transfer. If a steel backing is added, its thermal properties must be integrated into the overall calculation to accurately assess heat transfer. Understanding these principles is crucial for optimizing the thermal performance of photovoltaic systems.
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I was wondering how one would calculate the heat transfer of an object such as a photovoltaic panel that is made up of different materials, all with different thermal conductivity values. Also how would one calculate the heat transfer if a photovoltaic panel is on top of a flowing water source.
 
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Since the panel is solid (doesn't have an air gap with air flowing in it), you can use conductive heat transfer and the idea of the composite plane wall.

http://www.nd.edu/~msen/Teaching/IntHT/Slides/03A%20-Chapter%203%20-%20Sec%203.1%20thru%203.4.ppt

Pay particular attention to slide 6
 
But how would one find the overall heat transfer coefficient of the solar panel. Would I just use the thermal conductivity value of the solar cells and use this value for the entire photovoltaic panel. Also what value would I use if I added a steel backing to the photovoltaic panel.
 
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