Papers by Keyword: Solar Energy

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Authors: Wen Qiang Zhang, Hao Bai Wen, Fei Fei Zhuang, Shuo Jin Ren, Ye Wen, Ke Liang Li, Gong Ming Xin
Abstract: A system is designed to combine the solar disc power generation and desalination in this paper. The steam generated in the solar disc system goes into the low-parameter steam turbine to produce electricity. Then the exhaust steam heats seawater in the desalination device, acting as a low temperature heat reservoir which makes the seawater boils to dilute. A tracking system adopting the "Date-time - latitude-longitude - sunlight incident angle" match pattern is designed to track the position of the sun, in order to achieve the maximum solar power input.
Authors: Hua Zhang, Xu Ji, Ming Li, Qiang Wang, Xiang Bo Song
Abstract: This paper performed a comparative study on solar photovoltaic refrigeration technology and solar adsorption refrigeration technology. The experimental results showed that in sunny day, COP of the solar fin pipe adsorption refrigerator was 0.13, and was higher than 0.12, COP of the photovoltaic refrigerator. With the solar radiation enhancement within a certain range, the COP of solar adsorption refrigerator increased faster than COP of solar photovoltaic refrigerator. From the aspects of economy, with the same refrigerating capacity, the cost of the adsorption refrigerators was 30% higher than that of the photovoltaic refrigerators.
Authors: Piet Sonneveld, Gert Jan Swinkels
Abstract: In an previous research project a new type of greenhouse with an integrated concentrated photovoltaic system (CPV) was developed which has an integrated filter for reflecting the near infrared radiation (NIR) to the greenhouse and exploiting this radiation in a solar energy system. The performance of the system was promising. In this study further optimalisations of the CPV system are made to avoid the large construction for solar tracting. Hereto all parts will be integrated into the greenhouse. The NIR-reflector material is carried out as a NIR-reflective lamllea system and the CPV–module is mounted into the ridge. In this paper the results of the optimization process of the CPV system based on NIR reflecting lamellae is presented. The optimization process is based on a maximal total annual electricity production and is performed with a ray tracing model and actual radiation data. Results show that the optimization of the lamellae greenhouse can be seen from a theoretical and a practical point of view. Theoretically, the number of lamellae for the investigated concept must be high (>100) and focus with a generic focal length of 3.5 m and glazing bars must be avoided. Then the maximal annual electricity output can be over 26 kWh/m². In practice, mechanical restrictions, plant conditions and costs will determine the implementation. The proposed CPV-system has positive side-effects like reducing the heat load (and need for cooling) during summer and blocking of the direct radiation which can be harmful for some crops. With this, the feasibility of the system depends greatly on local conditions which require a tailor-made economical analysis.
Authors: Tanakorn Wongwuttanasatian, Denpong Soodphakdee, Narinporn Malasri, Kittichai Triratanasirichai
Abstract: Net Zero Energy Building (Net ZEB) concept has been applied to make a selected building as a self-energy provider. The building was partly modified to reduce its energy consumption using several energy efficient technologies such as wall material, insulator, VRF air condition unit, solar lighting, LED light bulbs, etc. While, electricity served into the building was generated by solar energy (PV panels). The monitored data over one year have proved that this build can generate the electricity more than its energy demand. This is a good achievement of Net ZEB in Thailand.
Authors: Suneetha Racharla, K. Rajan, K.R. Senthil Kumar
Abstract: Recently renewable energy sources have gained much attention as a clean energy. But the main problem occurs with the varying nature with the day and season. Aim of this paper is to conserve the energy, of the natural resources. For solar energy resource, the output induced in the photovoltaic (PV) modules depends on solar radiation and temperature of the solar cells. To maximize the efficiency of the system it is necessary to track the path of sun in order to keep the panel perpendicular to the sun. This paper proposes the design and construction of a microcontroller-based solar panel tracking system. The fuzzy controller aims at maximizing the efficiency of PV panel by focusing the sunlight to incident perpendicularly to the panel. The system consists of a PV panel which can be operated with the help of DC motor, four LED sensors placed in different positions and a fuzzy controller which takes the input from sensors and gives output speed to motor. A prototype is fabricated to test the results and compared with the simulation results. The results show the improved performance by using a tracking system
Authors: Rumen Kirilov, P. Stefchev, Z. Alexieva, H. Dikov
Abstract: High effective selective absorbing bimetallic structures of Sn and Ni for solar thermal collectors have been investigated. They were produced by cathode electrodeposition on polished copper plates from water solution. Scanning electron microscopy micrographs show that they consist of a highly branching layer of bimetallic needles. They serve as a radiation trap for the solar radiation because of multiple reflections. The reflectance spectra were measured in the visible and infrared range. The absorptance of the coating was calculated as 98% in the solar radiation range and the thermal emittance in the infrared region at 100 °C - as 10%. The selective absorbing coatings are investigated by X-ray diffraction analysis and X-ray photoеlectron spectroscopy as well as optical spectra in the UV-VIS and IR region. The samples with selective absorbing coatings have been tested at natural solar radiation. The results show that the new coatings have substantial advantages in comparison to the widely used black chrome.
Authors: Nicolae Mircea Dehelean, Liana Maria Dehelean
Abstract: The conventional engine cannot start alone. The engine needs a special device to turn it on. This device is usually an electric motor that is called starter. Any other engine that uses another working cycle then Otto cycle or Diesel cycle could accede to a self-starting ability. The paper tries to use ancient ideas in order to develop a true thermal engine able to use solar and other renewable energy. This unconventional engine inherits some ideas from the perpetual motion machine solutions.
Authors: Amy H. I. Lee, Kuan Chin Shen, Ying Wei Tu, Chun Yu Lin, Wei Ming Wang
Abstract: Current use of excessive oil and natural gas is causing the greenhouse effect, the destruction of the Earth's ecology, and the increase in disaster crises. Many countries are forced to start looking for new alternative sources of energy to prevent irreversible environmental problems. Taiwan is an island belonging to subtropical area with abundant sunshine, and it is very suitable for the development of solar energy.Due to the effect of high atmosphericpressures in summer and continental cold masses in winter, coupled with complex terrain, different weather phenomena exist in the northern and southern Taiwan, and the weather, temperature, sunlight and rainfall are different in different places.Before setting up a solar plant, a good assessment and planning is necessary to prevent a waste in financial and natural resources in the future. This research first uses literature review to search for the important factors, and experts are invited to confirm the factors.Data envelopment analysis (DEA) is then applied to assess and analyze which areas in Taiwan are most appropriate for setting up solar plants.Results of the study shall provide solar industry for reference for sustainable development.
Authors: Yi Liu, Ding Yi Yang
Abstract: A new building type- cavity construction system with trombe wall was proposed. Solar thermal storage wall was used to heat air gap between glass and wall. Updraft passed through hollow floor and supplied heat to upper room. Heat transfer model was built and numerical simulation of this kind of buildings was done. The results showed that cavity construction system with disconnected trombe wall had appropriate air- flow organization and uniform heating effect, which had better serviceability to high-rise buildings.
Authors: Bo Qiang Xu, Jin Bo Li
Abstract: The maximum power point tracking (MPPT) of photovoltaic arrays can increase the output power of the photovoltaic systerm, improve the utilization of solar energy. This paper describes the output characteristics of the photovoltaic arrays and the principle of maximum power point tracking,then,based on Incremental conductance method, proposes a sub-type of the variable step size MPPT algorithm. simulated using MATLAB/Simulink, the final results show that the proposed algorithm is able to quickly track the maximum power point and power concussion problem has been significantly improved.
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