Real Time Data Acquisition System for Performance Analysis of Modified PV Module and Derivation of Cooling Coefficients of Electrical Parameters

Photovoltaic module working temperature significantly reduces the electrical efficiency, increases degradation rates and thermal stresses. In solar module operation temperature is an important issue. As with appropriate cooling system, electrical output can be increased, a special pass reverse flow absorber collector is designed and developed. And a commercial polycrystalline module is modified by gluing this heat extraction unit by thermally conducted epoxy at back surface of module through which water is flowing by gravity at preset flow rate and no pump is used. Electrical and thermal performance of modified system has been evaluated for climatic condition of Dehradun in comparison with reference module. From collected real time data cooling coefficients of electrical parameters of modified proposed module with respect to reference are derived by mathematical modelling and programming in MATLAB at optimized flow rate for minimum operating temperature. It is found that there is significant increase in electrical efficiency. The effect of environmental parameters on cooling coefficients is also analyzed. RS232 logic and MATLAB GUI are used to log the real time electrical and environmental parameters.