Experimental evaluation of planar heat pipes with active cooling integration for photovoltaic thermal hot-spot mitigation | 2026 Publication type A1 Journal article (refereed), original research Author(s) Mendis Rehan, Alobaid Falah, Karl Jüergen, Kaikko Juha, Saari Jussi, Albakri Sami Energy transition Energy (miscellaneous) LUT School of Energy Systems