Applied Mechanics and Materials Vols. 448-453

Abstract: An extreme seeking (ES) method is given for the optimal design of the thermal energy storage (TES) tank in a trough solar collector system. The energy storage tank in such a solar energy collector performs a filter which regulates the heat transfer in some applications. It is desirable that the volume of the TES tank is optimized in terms of the best performance of heat regulation. The main idea is to construct a simulation scheme that emulates repeatedly the dynamical process and varies the key parameter of the tank at all iterations. The governing algorithm is a convex optimization. A case study that incorporates the above method is examined in the city of a province in China. It is shown in the numerical results that the volume of the TES tank is key variable that influences the performance of heat transfer; the proposed ES method is effective to seek the optimal volume.

Abstract: We design a controlled thermal solar desalination system that can operate at some desirable conditions automatically. The scarcity of fresh water in some regions pushes forward to the industry of water desalination. However, the existing water desalination technologies are energy-consuming and the cost is high. Here, a water desalination system is designed in such a way that the solar thermal energy is used to take place of the fossil fuel energy and the operation of the whole system becomes automatic. As a result, the proposed system is environmental friendly endowed with the green energy and the cost is reduced due to the elimination of the costly fossil fuel.

Abstract: The technology of composite light trapping film with smooth surface crystalline silicon is presented as an effective measure to enhance the absorptivity of silicon solar cell based on macrostructure at the interface of film.Genetic algorithm,which can be applied for multi-objective optimization,is used to optimize the microstructure of light trapping film.The reflection of smooth surface crystalline silicon is minimized to under 8%,resulting in a remarkable enhancement of initial efficiency for silicon solar cell.

Abstract: The natural ventilation in a novel built-in photovoltaic-Trombe wall (BiPV-TW) was numerically simulated by CFD method. The effect of solar radiation and channel width on the airflow pattern and ventilation rate was analyzed. Results showed that the solar radiation and channel width influenced the ventilation rate remarkably. As the solar radiation increased, the ventilation rate increased. As the channel width increased from 0.1m to 0.4m, the ventilation rate monotonously increased. However, when the channel width exceeded 0.5m, the reverse flow was formed in the tope zone and the ventilation rate decreased. A maximum air volume flow rate was achieved when the channel width was approximately equal to 0.4m in a 3m tall model.

Abstract: The output characteristics of photovoltaic (PV) cells are usually nonlinear, influenced by solar irradiation, environmental temperature and load characteristics. The maximum output power of PV cells changes with external environment. In order to improve the system efficiency and make PV cells work near the maximum power point (MPP), it is necessary to adjust the operating point. A variety of maximum power point tracking (MPPT) methods have been proposed. This paper compares these methods and summarizes the advantages and disadvantages of them. Finally, the key problems and development prospects of MPPT technology are analyzed.

Abstract: To solve the car in the sun after the problem of high temperature inside the car, to make the intelligent vehicle based on solar power generation and semiconductor refrigeration air conditioning, the solar panels convert solar energy into electrical energy, in our production based on ARM architecture - M3 processor core LM3S615 micro controller of solar power controller under the control of the converted to battery power, battery supply power to refrigeration semiconductor under the controller control of semiconductor refrigeration elements side pick up the car refrigeration is reduce the interior temperature, heating surface pickup in vitro heat pipes for heat transfer to the outside of the car, and the car is equipped with temperature sensors to detect the temperature inside the car can, when the temperature reaches a set temperature refers to the controller control battery supply power to refrigeration piece to reduce the temperature inside the car, when the temperature is lower than a set temperature controller to control battery direction to the cooling power to improve the temperature inside the car, achieve the result of intelligent temperature control of the car, to reduce pollution, save energy and has strong practical value.

Abstract: This paper mainly summarizes four kinds of solar power generation. They are solar roof, photovoltaic power station in space, solar power tower and solar hot air power generation technology. And the paper also contrasts these four kind solar power generation from the viewpoints of technology, power generation efficiency and cost, which provides references for solar power design.

Abstract: This paper discusses the principles of solar adsorption refrigeration and the characteristics of air conditioning radiation, designs solar adsorbent bed with activated carbon - methanol as working pair and its accompanying condenser, evaporator, radiant cooling tubes and other equipment. Through experiments, it changes water supply by change flow rate of chilled water, in order to get chilled water supply and return water temperature and room temperature curve. To analysis COP value of system under different flow rate of chilled water, and get the optimal flow rate of chilled water supply.

Abstract: The paper presents the thermoelectric coupling model for a photovoltaic (PV) module. Firstly, the five-parameter electrical model and the thermal model of the PV module are investigated. In order to evaluate the effectiveness of the model, the numerical computation and experimental values under certain environmental conditions are compared. The experimental results demonstrate the model has reasonable accuracy. Furthermore, to investigate the PV modules performance under different ambient temperature, irradiance and wind speed, the model is used to simulate the thermoelectric characteristics of the PV module. The simulation results can provide meaningful method to predict power generation of the PV module under various conditions.

Abstract: In practical applications,the solar cell is always used in the form of Solar Cell Module which consist of two or more solar cells connected in series or parallel. Therefore, the study of the Solar Cell Module reliability screening has more practical significance than the single solar cell. Based on the previous En-In Model, this paper analyzes the Solar Cell Module consists of two solar cells connected in different patternsthe series and the parallel, and obtains the corresponding noise parameters. Then, the concept of connection matrix C is put forward. In the end, this paper gives the corresponding conclusions by comparing the measurement results. The results of dual solar cells network will be the basis for future research of the Solar Cell Module reliability screening.