The three dimensional effect was reduced while operating fan-induced hybrid airflow developing air velocities by the induced draft fan fixed on the opposite wall so that it was placed a distance from modules were wi thin 0.5 °C under simi the ventilated wall of test section containing photovoltaic ampl validated by one of the experiments tha t measured surface temperatures of the two current, voltage, solar irradiation and air velocity signals were connected to a data computer for data storage. The air velocity sensor was placed perpendicular to the walls of collector to record 21. axial air velocities of adjacent by at ifier. It was PY lar operating conditions [2]. The thermocouple outputs, ogger and a the the airflow near the outlet of the parallel plate air passage bd: The operation of air velocity sensor (make-Dwyer instruments, model no. 640-0 the current output and has four field selectable ranges for air velocity measurement fro m/s and has accuracy of + 5% for range of 0-1 m/s at the operating air temperatu 100°C [2]. In order to minimize boundary layer effect in air velocity measurement, ai sensor was placed at middle air-gap width at a distance of 45 mm from either of the w m 0 re range r ve. was based on to 60 collector. To minimize turbulence effects in air velocity measurement at the entrance and exit region of the collector, velocity sensor was placed at outlet (at 1100 mm from the bot photovoltaic amplifier with total air passage length of 2100 mm in the test section [2]. ae ttom ofa Table I Electrical measurement results with varying resistance of potentiometer Table III Location of sensors in the experimental setup Conclusive Remarks Note: x is horizontal; y is vertical; z is adjacent 3 axis of x-y plane of Figure 1