Advanced Materials Research Vols. 1008-1009

Abstract: This study adopted analytical hierarchical process (AHP) to evaluate the significance of the policy criterion for promoting solar energy, regarding social publics’ points of view. The results of the study are described as follows. The social publics suggested that the most important major criteria are in the following order: policy, technique, educational promotion, and economy incentives. For the global weights of the criteria, the criteria with top five weights are in the following order: “patents for solar energy products“ (0.183), “encourage R&D of new techniques and reduce power cost“ (0.168), “improve power saving technique“ (0.095), “encourage the firms to develop new techniques of solar energy power“ (0.082), and “increase percentage of solar energy power in total power capacity“ (0.075).

Abstract: Tillandsia Usneoides (TU) is a kind of plant without root and can live without soil. It balances the conflict between urban greening and vertical development of urbanization compared to traditional shading plants. TU can be formed as plant curtain of any density, size and shape for vertical shading especially in high-rise buildings. This paper observes solar radiative properties of TU with experiments. The results show that the absorptivity, reflectivity and transmissivity of TU leaf are recommended as 0.64, 0.36 and 0.

Abstract: This paper introduces the characteristics of solar energy and expounds the fundamental principle of the solar absorption refrigeration, adsorption refrigeration and ejector refrigeration.It also analyzes their respective advantages and disadvantages of three solar refrigeration techniques, and the future research direction of solar refrigeration technique is prospected.

Abstract: This paper has built the mathematic model of the single-phase two-stage photovoltaic(PV) grid-connected system. The model consists of a boost DC/DC converter and a DC/AC inverter with LCL filter. On the basis of the variable step perturbation and observation method(P&O), the boost converter changes the output voltage of the PV array by adjusting the duty cycle to realize the PV maximum power point tracking(MPPT). The inverter system restrains the voltage fluctuation effectively by using feed-forward of the grid voltage and current tracking control technology, which has the high performance in both sinusoidal reference tracking and disturbance rejection. LCL filter improves the dynamic performance and restrains the high harmonics efficiently. The simulation with Matlab soft confirms the effectiveness of the model and control strategy.

Abstract: In view of the solar array of the solar wing UAV, this paper presents a method of using Bird model and HDKR model to calculate the solution of sun light intensity, and thus the power can be calculated. According to the engineering requirements, it is convenient to calculate the results using DO model in fluent software. Both methods are relatively easy to calculate the surface of the solar array power generation. Finally, this paper makes a detailed analysis on the UAV solar array power characteristics. The flight latitude, season, heading angle and pitch angle of the solar powered UAV have an influence on the power generation characteristics and rules. The results show that the power of the solar power generation quantity, is not only related with the attributes of the battery itself, but also greatly influenced by the weather, season, the UAV flight attitude as well as the latitude and longitude.

Abstract: Together with advancement associated with technologies things have gotten simpler and less complicated for people. Automation is usually the employment of manage devices along with details technologies to scale back the need regarding human being do the job inside creation associated with things along with products and services. Solar photovoltaic (PV) technology is regarded as the famous energy source amongst renewable energy sources which in turn that utilize to relieve usage of fossil fuel. PV energy is usually a lot of abundant energy sources among renewable energy. PV technology is change sunlight energy into electrical energy. The performance of electricity of PV module can be affected by solar irradiance and ambient temperature. When PV technology is process solar irradiance, producing lowered performance of PV modules and increasing temperature of PV module. When the temperature of PV module is reach at or more than 35 °C that detected by LM 35, PIC 18F4550 is switched ON the DC cooling system and vice versa. After switch ON the cooling system, the temperature of PV module is reducing. This controller system is an intelligent system because it will run the cooling system automatically when the temperature of PV module reaches setting level that detected by temperature sensors. The higher efficiency of PV cell, the payback period of the system can be shorted and the lifespan of PV module can also be longer.

Abstract: In this study, a kind of concentrated solar cooling, heating and power (CSCHP) system is analyzed by exergy method. When solar trough receiver obtains energy from sun and radiates heat energy to the external environment, the optimized operation temperature that balance the process is predicted based on exergy index and external environment temperature. For building scale utilization, A CSCHP system is further developed according to the thermodynamic cycle. It is found that the biggest exergy losses occurred in light-heat conversion, the best exergy efficiency is near 30% when the external environment is about 300K.

Abstract: In recent years, along with the continuous expansion of the scale of photovoltaic (PV) power generation in Tibet, the proportion of PV Grid-connected capacity for Tibet power grid became higher increasingly, which brought great challenges to the secure and stable operation of the grids. So we do those studies on the available capability of accommodating PV power generation of Tibet power grid. Based on the way of capacity of peak load regulation and the minimum output in 2012, this paper simulates and analyzes the available capability of accommodating PV power generation under three boundary conditions, considering the factor of Qinghai-Tibet direct current participating in regulation. The analysis supports that the rate of discharging light accounts for 34.09 percent, 20.57 percent and 5.61 percent after PV power station connecting to the grid, if regardless of the measures of depth peak load regulation such as discharging light.

Abstract: The electricity shortage can be effectively alleviated by developing household photovoltaic power system in vast rural areas, it is necessary to establish simulation models. In this paper, the dynamic modeling of household photovoltaic power system including photovoltaic,Cuk-chopper circuit,battery and a single phase PWM inverter have been made in the ElectroMagnetic Transient Program /Alternative Transient Program(EMTP/ATP) software package.Control strategy based on MPPT for the power control of the inverter have been also developed. Operation characteristic of household photovoltaic power system was developed. Simulation results proved the validity of the model.