Advanced Materials Research Vols. 724-725

Abstract: Cell temperature can reach as high as 70 oC while working, using only photovoltaic battery in the solar plane will result in a waste of energy. Combined with the wing configuration, a hybrid energy design method with higher efficiency is presented: photovoltaic cells will be distributed on the wing surface and photothermal cells will be arranged in the wing box section. The back of photovoltaic battery can be used as high temperature heat source and the lower wing surface can be a low temperature cooling source. Through the research of photovoltaic cells maximum power output, the envelope method ensures the output power, improves the power tracking reliability, and reduces difficulty in the design. The structure design of thermoelectric battery P-N junction is optimized by using the maximum power and maximum power to-mass ratio as objective function. The optimal solution of P-N junction structure of a certain type thermoelectric battery is given for acquiring maximum power-to-mass ratio.

Abstract: The anodic aluminum oxide (AAO) templates on polycrystalline silicon substrate are studied for growth of ordered nano-dot arrays in order to fabricate the porous silicon layers. The AAO templates on polycrystalline silicon substrate with pores of average diameter 50nm were successfully prepared by one-step anodization of high pure aluminum layer deposited on polycrystalline silicon in oxalic acid solution. Scanning electron microscopy (SEM) showed that alumina nano-pore arrays were nicely constructed with smooth wall morphologies and well-defined diameters.

Abstract: According to the mathematic model of solar cells, builds its general simulation model based on the S-function designed under the Matlab/Simulink environment. Presents the incremental conductance algorithm based on the optimal gradient to simulate and verify the theories about the maximum power point tracking (MPPT) of photovoltaic power generation. Give the in-depth contrast analysis on the power, output voltage characteristics of photovoltaic power generation, which lays a solid foundation for engineering practice.

Abstract: Output power of photovoltaic cell will change along with the change external environment and load. In order to give full play to the photovoltaic device efficiency and response external environment change fast, A maximum power point tracking circuit is need to be used. In this paper power voltage curve of photovoltaic cell is analyzed exactly. According to the analyzed results, the fuzzy control is applied into maximum power point tracking control of photovoltaic power generation system. This approach can make system working in the maximum power point without interfering with the normal work of the system. It improves that system stability. The simulation results prove that this approach can track the maximum power point of solar cell quickly and accurately.

Abstract: Solar energy, as a new type of energy for sustainable development without pollution, has caught much attention all over the world. Adequately improving the utilization rate of solar illumination is taken as the only means of using solar energy in maximum. This paper introduces two different tracking modes of the solar tracker which can switch automatically: Sensor tracking mode and the sun trajectory tracking mode. These two modes can self-switch and cooperate with each other to achieve high precision of all time automatic tracking.

Abstract: In this paper, in order to increase the efficiency of solar energy collection in winter, a method to set the semi-fixed collector was proposed. The best angle of the quasi-fixed solar collector have be calculated and given in Daqing region. According to comparison and analysis, we find that the efficiency improved 8.3%; it will collect solar energy 410.46MJ per square more than fixed collectors every year.

Abstract: Rare earth ion-doped nanoparticles NaYF₄:Yb³⁺,Ho³⁺ is one of the most efficient up-conversion nanosystems, when mixing a TiO₂ heterogeneous layer outside can extends the range of NaYF₄:Yb³⁺,Ho³⁺ nanoparticles absorb solar energy. In this work, a multi-functional mixed NaYF₄:Yb³⁺,Ho³⁺-TiO₂ structure was synthesized. The micromorphology, structure and particle size of the up-converting nanoparticles were characterized by transmission electron microscopy (TEM), and room temperature up-conversion luminescence (UCL) spectrofluorimetric measurements. The mixture of NaYF₄:Yb³⁺,Ho³⁺ and TiO₂ nanoparticles was applied to Dye-sensitized solar cells (DSSCs), the photoelectric conversion efficiency of the DSSC with up-conversion material is nearly twice as much as of the control DSSC irradiated by infrared (IR) light.

Abstract: Photovoltaic system composition and core component function characteristics are studied in this research; Influences of photovoltaic power generation system cost, the key factors of life and setting detection control parameter for photovoltaic are pointed. Compared with traditional photovoltaic system monitoring methods, a photovoltaic remote monitoring system design example based on configuration software is given after analyzing their viability and necessity deeply.

Abstract: Solar energy is the main source of all energy on earth. The earth obtains the total energy annually is ten thousand times of the earth energy consumption at present, but the solar energy has a lower energy density on the earth's surface. If we want to use the solar energy, it is necessary to solve the intermittent and reliability problems of solar energy. Setting the storage device is one of the most effective methods to solve the above problem. The research and development of new energy sources and energy saving are two key ways to solve the potential global energy shortage. Solar assisted heat pump system has a wide and wonderful future for its excellent performance in energy saving and environment protection. This paper discusses the technology of thermal storage in solar energy system and introduces thermal storage .The experiment was done in Qingdao climates. Presents the laws of the thermal storage tank and the average heat output is 11.63 KWh in 8:0016:00.

Abstract: This article describes the solar - earth source heat pump system characteristics and operating principles, the various operating modes of the system are discussed, and the system applied in Lanzhou region were analyzed. Pointed out that the relatively rich regions in the solar promote the use of solar - earth source heat pump technology has good prospects for development.