OICC Press International Journal of Energy and Environmental Engineering 2251-6832 3 1 (December 2012) 2012 10 03 Correlation between thicknesses of dust collected on photovoltaic module and difference in efficiencies in composite climate 10.1186/2251-6832-3-26 EN Rahnuma Siddiqui Renewable Energy Research Laboratory, Department of Physics, University of Lucknow, Lucknow, 226007, IN Usha Bajpai Renewable Energy Research Laboratory, Department of Physics, University of Lucknow, Lucknow, 226007, IN Journal Article 2012 10 03 Abstract An effort has been made to develop an equation with the given data for all seasons for a location (Lucknow, India) consisting of composite climate, which is further helpful in developing a relation between difference in efficiencies of module with respect to thicknesses of dust collected on the module. This equation that is developed mathematically is in good correlation with the measured data. Here, data are shown for a whole year (from 2010 to 2011); the study done gives us a broad view of finding out the difference in efficiencies of module when dust collects on it.