Design, Implementation and Validation for a Hybrid Photovoltaic /Thermal Tracking System Magdy M.Abdelhameed / M.A.Abdelaziz A.Bayoumi Mechatronics Department, Faculty of Engineering Mechatronics Department, Faculty of Engineering Ain Shams University (ASU) The British University (BUE) 11782, Cairo, Egypt El Sherouk City, 11837, Cairo, Egypt Abstract—In this paper a comparison between numerical model and experimental work results for a tracking Photovoltaic/ Thermal (PV/T) hybrid system is presented. The simulation in this work is based on a numerical model in solving the equations and determining the Photovoltaic (PV) cells characteristics using both MATLAB and COMSOL Multiphysics. COMSOL is simulating the electromagnetic waves produced by the Sun through solving Maxwell's equations in three dimensions using Finite Elements Methods (FEM)and the sun irradiance is assumed to be Gaussian distribution across the twelve mourning hours. Beside that an experimental work is presented depending on the results conjured from the theoretical experience used in Comsol Multiphysics. In addition to the above a thermal analysis for the tracking PV modules and the piping water is presented where the input, output temperatures, rate of heat transfer, overall heat transfer coefficient and thermal efficiency are calculated. As a result, a significant enhancement in the total electrical efficiency is observed with acceptable increase in the output water temperature. Table I: Nomenclature Symbol Description Units H Planck’s constant 6.626*10 ଷସ J*s C The speed of light 3*10  m/sec P12 The transition of an electron from E1 to E2 --------------- ---------------  ௩ (E1) The density of electrons in the initial state  ଷ  ௖ ሺ ܧ ଶ ሻ The density of available final states  ଷ KB Boltzmann constant 1.38*10 ଶଷ  ଶ *  ݏכ ଶ ܭכ ଵ Q The electron charge 1.6*10 -19 C T Temperature K Ep The phonon energy Joules vth The thermal velocity 10 5 m/sec S The grid-shadowing factor ----------- r(λ) The reflectance ----------- α(λ) The absorption coefficient  ଵ Г(λ) The incident photon flux ---------- I Current A V Voltage V ܫ ଴ଵ Dark saturation Current A ߟ ௘௟௘௖௧௥௜௖ PV efficiency. % Pout The maximum power output W Pin The total optical input power W V ୭ୡ Open circuit voltage V FF Fill Factor. % ߩFluid Density Kg/m ଷ t Time Sec U Fluid velocity m/sec P Electrical power out of PV cell W μ Dynamic viscosity Pa*s Cp Heat capacity at constant pressure J/ kg*K ׏T Temperature Gradient K* ଵ ݍ ௟௪ Long wave energy W ε Surface emissivity ---------- Σ Stefan-Boltzmann constant 5.67  W/ ଶ * ܭ ସ U Overall heat transfer coefficient W/ ଶ *K A Plate surface area and PV area  ଶ ݐ ௛ Thickness of the plate m a Pipe surface area  ଶ ܭ ௦௜ Silicon thermal conductivity W/ ଶ *K ܭ ஺௟ Aluminium thermal conductivity W/ ଶ *K ܭ ௉௜௣௘ Pipe thermal conductivity W/ ଶ *K  ௪ Water thermal conductivity W/ ଶ *K  ௔௜௥ Air thermal conductivity W/ ଶ *K ݎ ௜௡ Pipe inner radius m ݎ ௢௨௧ Pipe outer radius m l Plate length m w Plate width m L Total pipe length m Q . The rate of heat transfer W ∆T Temperature difference K Q ୦ୟ୲ Heat flux going into PV cell W/ ଶ q ୰ୟ Solar Irradiant W/ ଶ V ୫୮ Maximum power point voltage V I ୫୮ Maximum power point current A E ୧୬ Solar irradiant energy W E ୵ୟ୲୰ Thermal Energy extracted by water W m ୵ୟ୲୰ Mass of water Kg/s T ୭୳୲ The output temperature K T ୧୬ The input temperature K C ୮୵ୟ୲୰ Specific heat of water 4.18kJ/kg*K η ୲୦ Thermal efficiency. % E PV Electrical energy W η ୲୭୲ୟ୪ Total efficiency %