An Investigation For The Influence Of Heat Ransfer To Photovoltaic Cell

In recent years，photovoltaic power generation attracts more and more attention ofpeople. The key problem of photovoltaic solar cell is its elevated temperature. Theresearch indicates that with the elevated operation temperature, the open-circuit voltageand generated power reduces, while the short-circuit current increases. The outputpower of photovoltaic cells is reduced by0.06%when temperature rise1C. In thispaper, volume-control method was adopted to solve the temperature distribution ofsingle photovoltaic power generation system and photovoltaic-thermoelectric hybridsystem. We take the influence of concentration radio, heat transfer conditions andcontact resistant to the heat transfer into consideration.The results show that the heat flux and heat transfer conditions have a great impacton performance of photovoltaic cell. If the heat flux density into the system is1367w/m2, using air natural convection heat transfer(number Nu is14.98), the efficiency ofthe photovoltaic cells can reach17.6%. If the force colling method is adopted, thetemperature of photovoltaic cell can reduce. When the Nu is reaching1500, the cellefficiency can reach21%. We also found that adding thermoelectric module to thebottom of photovoltaic cell can reduce the temperature of cell. As the above heat fluxdensity and heat transfer condition, the efficiency of cell can reach19.37%. Comparedwith single photovoltaic power system, the temperature of cell is reduced by8.3%, thepower generation is increased by10.1%. If enhancing heat emission, when the Nu isbigger than1500, changing of Nu can nearly influent the efficiency of photovoltaic celland thermoelectric module.It was found in study on heat transfer characteristics of a hybrid system that thechoice of contact ways between thermoelectric module and photovoltaic cell isparticularly important as the contact resistant restricts the heat-transfer capabilitybetween contact surfaces in a very great degree. Interference contact in this paper wasproved to have less contact resistance and more useful enhancement of heat transfercompared with direct contact and silicone contact by studying different contactmethods.