Fig. 1
From: Improving solar PV performance under bird-dropping conditions with a dual-cooling approach

Experimental setup for (left) Complete setup; (right) Schematic diagram for front and backside cooling: 1- wooden frame 2- cotton fabric 3- Acrylic sheet 4- Four axial fans (Air exit) 5- Inner water pipe 6- Outer pipe 7- submersible pump 8- Reservoir 9- PVC pipes 10- Valve 11- Water collector 12- Filter.