Research On The Cooling Performance Of Solar Photovoltaic Refrigerator With The PV Modules In The Active Or Passive Cooling

Solar photovoltaic (PV) is one of the most prospective technology in renewable energy. With the increasing depletion of energy, and the deterioration of environment, to develop solar photovoltaic technology has strategic significance. Solar photovoltaic refrigerator system is been favored since it is non-contaminative, safe, compact, and easily to use and maintenance.According to the existing problem of solar photovoltaic, putting forward a solution that based on using heat pipe with reinforced heat exchange function in solar refrigerator system. Consequently, the conclusion has a certain extent guiding significance for the improvement of the performance of the solar DC refrigerator system and the photoelectric conversion efficiency of photovoltaic modules. The research work mainly includes the following aspects:1) Designing a set of PV modules which use heat pipe to strengthen heat transfer in DC refrigerator system, and making the performance optimization. Building the solar DC refrigerator prototype in the base of the analysis of the energy conversion of solar DC refrigerator system.2) Description and discussion on the main components which are solar photovoltaic storage battery, controller and refrigerator. Furthermore, giving a brief principle of the solar DC refrigerator system.3) The experiment measured the performance of the refrigerator system under various typical weather conditions in Kunming. Through changing the naturally or mechanically cooling method in solar DC refrigerator system, getting a series of parameters. The experiment variables include parameters such as the voltage and current on both ends of the photovoltaic modules, the battery voltage and current, the total solar radiation intensity, air flow rate, and temperatures of cell substrate, heat pipe surface and air in cooling channel. After analyzed experiment data has get a conclusion is that the effect of mechanically cooling in solar DC refrigerator system is more significant compared with naturally cooling. Tests were carried out in no-load condition and load condition, the average temperature of the refrigerating chamber is 1.91℃ and 5.95℃, freezer temperatures is -9.16℃ and -9.82℃, and the refrigerator operation rate is 40.2% and 46.5% respectively. When the refrigerator system was operated in load condition, the coefficient of performance of solar DC refrigerator system can achieved 0.10.This thesis focuses on the combination of photovoltaic modules with heat pipe cooling technology in improving the performance of solar photovoltaic refrigeration system. The conclusions of this thesis have certain reference significance for the optimization and improvement in photovoltaic module and performance of solar photovoltaic refrigeration.