scholarly journals MODEL EXPERIMENT AND FIELD TEST OF PW-OWC TYPE WAVE POWER EXTRACTING BREAKWATER

2017 ◽  
pp. 2
Author(s):  
Kenichiro Shimosako ◽  
Taro Arikawa ◽  
Masahide Takeda ◽  
Kazuyoshi Kihara ◽  
Yasushi Hosokawa ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Conversion Efficiency ◽  
Field Test ◽  
Large Scale ◽  
Energy Conversion Efficiency ◽  
Primary Energy ◽  
Wave Power ◽  
Medium Scale ◽  
The Past ◽  
Wave Power Conversion

Many research studies on wave power conversion have been conducted in Japan over the past 30 years, but the outgrowth of these studies have yet to be put to practical use. In this study, medium-scale and large-scale hydraulic model experiments as well as prototype field test on a new oscillating water column with a projecting wall (PW-OWC) wave power extracting breakwater were carried out in order to investigate the efficiency of energy conversion. The primary energy conversion efficiency of the PW-OWC converter is about 10% larger than that of the standard OWC type used in the medium-scale experiments. The primary energy conversion efficiency of the large scale experiments is about 20-30-% smaller than that of the medium scale experiments. The secondary energy conversion efficiency ranges from 0.20 to 0.42 and becomes small when the wave period is short and the wave height is large.

Investigation and Analysis on the Performance of the Oscillating Buoy Wave Power Device under the South China Sea

2013 ◽  
Vol 321-324 ◽  
pp. 1365-1372
Author(s):  
Lai Feng Mao ◽  
Jun Zhang ◽  
Quan You Qu ◽  
Hong Zhou He
Keyword(s):  
South China Sea ◽  
Energy Conversion ◽  
Conversion Efficiency ◽  
South China ◽  
Dynamic Characteristics ◽  
Wave Energy ◽  
Energy Conversion Efficiency ◽  
Power Device ◽  
Wave Power ◽  
China Sea

The oscillating buoy wave power device is more effective than other devices in energy conversion efficiency, and now it has been widely applied in development of marine wave energy. The oscillating buoy, which is an important component for the oscillating buoy wave power device, is closely related to energy conversion efficiency. In this paper, considering applying conditions in South China Sea, the dynamic characteristic for oscillating buoy is simulated using AQWA software. By analyzing and comparing dynamic characteristics of several different structure bodies, an optimal structure buoy is obtained and it has better energy conversion efficiency.

Research Progress of Quantum Dot Solar Cell

2013 ◽  
Vol 320 ◽  
pp. 693-697
Author(s):  
Wei Cui ◽  
Chong Wang ◽  
Yu Yang
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Quantum Dot ◽  
Energy Conversion ◽  
Conversion Efficiency ◽  
Large Scale ◽  
Energy Conversion Efficiency ◽  
Research Progress ◽  
Cds Quantum Dot ◽  
Sensitized Solar Cells

The solar energy is the most promising energy to solve energy crisis and environmental problem. Quantum dot can be applied to solar cells in two structures of QDSC to improve the energy conversion efficiency. The two structures are p-i-n type QDSC and quantum dots sensitized solar cells. The energy conversion efficiency of p-i-n type QDSC may increase up to 45%. Both CdSe and CdS quantum dot can be used as the sensitizer of the QDSSC and each of them has its demerits and merits, but the conversion efficiency of QDSSC is low if they were used respectively. Thus, in order to overcome their demerits respectively, we could try to combine their merits. QDSC is the most promising technique to solve the problems of solar cell. But before large-scale application their efficiency and stability should be improved.

Composition Engineering of Organic–Inorganic Perovskites Prepared in Air for Highly Efficient Energy Conversion

2020 ◽  
Vol 15 (5) ◽  
pp. 592-598
Author(s):  
Yang Li ◽  
Ruiquan Liao
Keyword(s):  
Solar Energy ◽  
Energy Conversion ◽  
Conversion Efficiency ◽  
Large Scale ◽  
Carrier Transport ◽  
Perovskite Solar Cells ◽  
Clean Energy ◽  
Energy Conversion Efficiency ◽  
Fabrication Process ◽  
Scale Production

The global energy crisis significantly raises the research on renewable energy materials and devices both in academic and industrial community. Besides the electrochemical energy such as batteries, the solar energy is another choice to develop renewable clean energy. During the last ten years, the perovskite solar cells (PSCs) has been a hot research topic and developed fast. However, large-scale production of PSCs is still hindered by the high cost of their fabrication process, because the perovskite films are known to be sensitive to oxygen and water. Therefore, developing a composition engineering in air for PSCs with high solar energy conversion efficiency is urgently required in the field. Herein, it is found that the crystallization and morphology of CH3NH3PbI3 (MAPbI3) perovskite films prepared in air are dependent on the processing methods. The perovskite grain size becomes larger when the concentration of CH3NH3I (MAI) solution was increased from 20 mg/mL to 70 mg/mL, which is beneficial for charge carrier transport and device performance. Thanks to the optimal perovskite fabrication process, the champion PSC has been fabricated in open air and it shows a power conversion efficiency (PCE) of 14.9%. More importantly, the PSC fabricated with our method shows good stability. This work provides an effective composition engineering to fabricate PSCs in air with both high PCE and stability.

First-principles study on the electronic and optical properties of the orthorhombic CsPbBr3 and CsPbI3 with Cmcm space group

2021 ◽  
Author(s):  
Xianhao Zhao ◽  
Tianyu Tang ◽  
Quan Xie ◽  
like gao ◽  
Limin Lu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Solar Cells ◽  
Energy Conversion ◽  
Conversion Efficiency ◽  
First Principles ◽  
Energy Conversion Efficiency ◽  
Space Group ◽  
Absorbing Materials ◽  
Halide Perovskites ◽  
Lead Halide

The cesium lead halide perovskites are regarded as effective candidates for light-absorbing materials in solar cells, which have shown excellent performances in experiments such as promising energy conversion efficiency. In...

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