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This is to certify that your paper entitled «Monthly Performance of a Photovoltaic Thermal System in Series with a Solar Thermal Collector in Laminar and Turbulent Regimes» was indexed with 17 pages, in the CIVILICA citation database, code COI:JR_IJCCE-42-10_027, after evaluation and approval of the referees of the "Iranian Journal of Chemistry and Chemical Engineering Vol 42, Issue 10 , Year 2025.

While offering our congratulations on the indexation of your paper, please be informed that this certificate is prepared based on the information submitted by the secretariat of the above journal and the information contained in the CIVILICA database, and the accuracy of its content can be inquired at any time through link provided at the bottom of the page or scanning the code image.