Study On The Performance Of New Solar Photovoltaic Thermal Integration Module

As the assurance of human living, energy resources become more and more limited due to the rapid intensive utilization of primary energy. As a result, the demand of seeking alternative ways like renewable energy attracts much attention. Among all the available renewable options, solar energy seems to be the most powerful energy resource. Solar radiations can be directly converted into either thermal energy or electrical energy, and the application with solar energy includes photovoltaic and photo-thermal, while the PV models and solar collectors have already been widely used in the daily life. However, with the increasing temperature of PV panels during the day, the electrical efficiency decreases. Also, the demand of installing space of sufficient solar radiation requires seeking better ways to spare the space and make full use of solar energy at the same time.A new type of photovoltaic thermal(PVT) system is designed taking air as heat transfer medium. At the back of PV panel, some spoilers are designed to form serpentine flow passages for air. There is a fan installed at the outlet of the PVT to supply some velocity for the air in the channel. In this way, the PVT model can not only be cooled to increase the electrical efficiency but also improve the outlet temperature to obtain thermal energy for daily use.The effectiveness of the design is verified through theory and experiment. First, mathematical model of the PVT model is built based on the energy balance analysis. The results of simulation with a method of iteration show that the highest overall efficiency of the system reaches 75.2% when the channel height is 0.03 m. Then this model is made in practice, and a comparative experiment is set up after testing the performance of the prototype. The test results show that efficiency of electrical of solar PVT system is 0.1% higher than that of normal PV system, and the thermal efficiency of PVT is around 25%, with the highest overall efficiency of 70%.The hybrid PVT system produce thermal energy and electricity as total output energy, which takes good advantages of solar resources and land resources. Reference value is provided for the daily supplication of power and heating.