Advanced Materials Research Vols. 860-863

Abstract: Taiwan is highly vulnerable in energy security, but geographic conditions for the development of solar energy applications have created a considerable advantage. However, the total installed solar energy capacity is far less than might be expected. Consequently, this study proceeds to explore the main factors that affect diffusion of solar energy application concerning Taiwan buildings. Through the evaluation decision-making system model and expert groups giving evaluation values and feedback, the study found twenty-three items of key influencing factors with seven major objectives, and propose strategies for energy development in the future to improve the quality and quantity of renewable energy applications and competitiveness of national energy. This research, in addition to providing references to relevant environmental energy systems for deployment and technological R&D, also provides developing and underdeveloped countries access to applications of solar energy technology assessment and forecasts for the future.

Abstract: With the battery charging or discharging, it can effectively stabilize power fluctuation of the photovoltaic generation (PV) or the load in a stand-alone power generation system. In this paper, based on the mathematical models of the PV and the battery, it connected the PV and the battery on the same DC bus and proposed energy management system with hysteresis control on the DC bus. In order to prevent the battery from switching back and forth among working state and stopping state, the outer voltage loop took the nonlinear function control strategy of the battery. With the inverter adopting voltage frequency (V/f) control strategy, it maintained the voltage and frequency on AC bus. With the PSCAD/EMTDC, it analyzed the ability of the battery stabilizing the power fluctuation of the PV or the load. And it proved the correctness and feasibility of the established models and control strategies. So those provided theoretical reference for the photovoltaic system that was employed efficiency in the remote areas.

Abstract: A short-term PV system power forecasting method is presented in the paper based on neural network considering fuzzy characteristics of weather factors. Weather factors that affect PV system power output mainly include temperature, radiation intensity, rain and relative humidity which are all of strong fuzziness. The paper firstly made use of membership functions to process their fuzziness. Then, the historical power data of a PV system was put into neural network together with fuzzy processed historical weather data to train the network, therefore, neural network that be able to forecast PV power was get. Finally, data of an actual PV system in Colorado was employed to methods with and without fuzzy processing of weather factors, results show that the method with fuzzy processing is more accurate than that without fuzzy processing.

Abstract: The solar water heating system based on the Internet of things (IOT) was designed, and the IOT communication module was studied. The topological structure of IOT system and the hardware and software design of communication module have been introduced. The GPRS and GSM coding analysis and the receiving and sending process of the communication module were introduced.

Abstract: This article explains a technique in which equations are developed to produce the irradiance profile around the receiver of LS2 collector using a vigorouslyverified MCRT model. A large range of test conditions including daily normal insolation, selective coatings and glass envelop conditions were chosen from the published data by Dudley et al. [1] for the job. The R² value is excellent that varies between 0.9857 and 0.9999. Therefore, these equations can be used confidently to produce boundary heat flux profile of the collector at normal incident for conjugate heat transfer analyses of the receiver.

Abstract: on the basis of the working principle of solar heat pump system is introduced in this paper, Focuses on the structure of the heat storage device and the selection of phase change materials, structure, The influence of phase change materials the size of the diameter to heat-exchange, The influence of phase change materials piled up form to heat-exchange, The influence of thermal fluid flow velocity to heat exchange , In-depth analysis of phase change materials and thermal fluid accumulation of heat and heat release process , Solve the problem of supercooling and dialysis of phase change heat storage materials, The use of phase change materials have a positive reference value.

Abstract: Experimental system for space heating of a ground coupled heat pump with solar thermal collectors at Songjiang district in Shanghai was designed and built on the basis of precise calculation and simulation of each part in the system. Through simulating the project, the best azimuth of solar collectors in Shanghai is south by east 22.5 °. Programmable control technology, frequency conversion technology and sensor technology applied to the design of the detection and control system.

Abstract: In photovoltaic (PV) power generation systems, the P-V curve of PV array contains several peaks under partially shaded condition (PSC) so that conventional MPP tracking (MPPT) methods can hardly find the real MPP (MPP). This paper proposes an optimized MPPT strategy, which is not only fit for PSC but also suitable for uniform shaded conditions (USC). Comparing the optimized MPPT strategies and conventional MPPT methods, this paper illustrates the improved performance of optimized strategy under PSC. The simulation and experiment results show that the optimized strategy can track the global MPP precisely to improve the efficiency of PV systems.

Abstract: This paper mainly uses the fault tree method to analyze the security of lightning protection system of the BIPV, to identify the main factors of influencing the lightning accidents caused by the loss of life, and provide a reliable basis for determining the safety performance of the lightning protection system, to achieve the purpose of preventing lightning accident prediction.

Abstract: Solar Building Integrated Technology is an important measure in architecture energy conservation and environment protection. Taking into account of factors of environment, the new LCA model of Solar Building Integrated Technology is set up and then a concept of Environment Impact Payback Time is put forward. At last, an example of a certain solar thermal system is conducted, the final impact value of which is-2382.39Pt, and the Environment Impact Payback Time is 10 years.