Abstract
Photovoltaic (PV) technology plays an important role in the progressing trend of using renewable energies in the world. Yet the negative impact of a cell's temperature rise on its performance is a major weakness of this technology. In this paper, the effects of both air blowing and emitted radiation are investigated experimentally in the ranges of 0–7.7 km/h and 360–840 W/m2, respectively. In this regard, using Central Composite Design (CCD), the experiment was designed and performed to evaluate the response of a PV module to both of the variables. The results show that the PV module temperature drops from 61 °C to 40 °C when radiation intensity is 840 W/m2 and air velocity is 7.7 km/h. This temperature reduction causes a 2.5 % rise in electrical efficiency. Three equations were derived in order to correlate the outcome of temperature, electrical efficiency, and output power of a PV cell, with respect to irradiation intensity and air velocity. It is realized that in order to enhance the PV module output power, the effect of air current velocity is potentially more promising than the irradiance intensity. Also, the results proves that the impact of cooling the module on electrical efficiency strongly depends on the level of irradiation intensity.
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