Experimental investigation of optimum wind speed for material dependent temperature loss compensation in PV modules

Energy is the key factor for the growth of any nation; it is important to analyze the true potential of energy. Worldwide societies are searching options for sustainable development. Recently solar energy has contributed a lot in the renewable energy; Sun light is available in abundant amount at maximum places on the globe. Solar Photovoltaic Systems are used to convert sun light in to electricity, which are static generators require least maintenance. It is estimated that 70% of the world total energy consumption can be provided from renewable; hence renewable energy is a choice for sustainable development and economic growth. The performance of Solar Photovoltaic Systems is site dependent, manufacture indicate the efficiency of conversion in STC (1000W/m2, 25 oC, A.M. = 1.5) at the back side of the module. Although many researchers have contributed in the area of performance improvement of solar PV Systems since last three decades, however yet it is difficult to generalize the performance considering different parameters like irradiance, ambient temperature and wind velocity. Generally natural wind speed effect is omitted, which leads to significant amount of energy neglected at windy locations. Earlier solar PV systems were of small ratings but now days; these systems are installed in large ratings. Thus true potential is not estimated by project planners hence over estimation of system size and long payback period is observed. In present work it is tried to analyze experimentally that up to what extent, wind velocity can reduce the thermal losses. During experiment it is observed that for average good wind speed 2–4 m/s even at low irradiance, Solar PV systems could be as efficient as that in STC because temperature losses can be brought down below 5% by natural wind cooling.