I'm looking for if there is a real estimate of the maximum exposure temperature of rigid PVC tube installed in the Mediterranean(sub-Saharan zone) ?

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Hadj Amar

Thank you Mr Otmane Boudouch, in the case where the PVC tube is installed underground and in exposition to the heat of the sun.How to estimate the temperature of black tube from the temperature of soil or the air and the duration of exposure ?.Are there an experimental formula?

thank you very much Mr Otmane Boudouch.