scholarly journals Direct-drive ocean wave-powered batch reverse osmosis

Desalination ◽  
2022 ◽  
Vol 523 ◽  
pp. 115393
Author(s):  
Katie M. Brodersen ◽  
Emily A. Bywater ◽  
Alec M. Lanter ◽  
Hayden H. Schennum ◽  
Kumansh N. Furia ◽  
...  
Author(s):  
Zhenwei Liu ◽  
Ran Zhang ◽  
Han Xiao ◽  
Xu Wang

Ocean wave energy conversion as one of the renewable clean energy sources is attracting the research interests of many people. This review introduces different types of power take-off technology of wave energy converters. The main focus is the linear direct drive power take-off devices as they have the advantages for ocean wave energy conversion. The designs and optimizations of power take-off systems of ocean wave energy converters have been studied from reviewing the recently published literature. Also, the simple hydrodynamics of wave energy converters have been reviewed for design optimization of the wave energy converters at specific wave sites. The novel mechanical designs of the power take-off systems have been compared and investigated in order to increase the energy harvesting efficiency.


2012 ◽  
Vol 37 (1) ◽  
pp. 35-44 ◽  
Author(s):  
Ken Rhinefrank ◽  
Alphonse Schacher ◽  
Joseph Prudell ◽  
Ted K. A. Brekken ◽  
Chad Stillinger ◽  
...  

Desalination ◽  
1989 ◽  
Vol 73 ◽  
pp. 81-94 ◽  
Author(s):  
Douglas C. Hicks ◽  
George R. Mitcheson ◽  
Charles M. Pleass ◽  
James F. Salevan

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Zhongxian Chen ◽  
Haitao Yu ◽  
Cheng Wen

The goal of direct drive ocean wave energy extraction system is to convert ocean wave energy into electricity. The problem explored in this paper is the design and optimal control for the direct drive ocean wave energy extraction system. An optimal control method based on internal model proportion integration differentiation (IM-PID) is proposed in this paper though most of ocean wave energy extraction systems are optimized by the structure, weight, and material. With this control method, the heavy speed of outer heavy buoy of the energy extraction system is in resonance with incident wave, and the system efficiency is largely improved. Validity of the proposed optimal control method is verified in both regular and irregular ocean waves, and it is shown that IM-PID control method is optimal in that it maximizes the energy conversion efficiency. In addition, the anti-interference ability of IM-PID control method has been assessed, and the results show that the IM-PID control method has good robustness, high precision, and strong anti-interference ability.


Author(s):  
H. K. Plummer ◽  
E. Eichen ◽  
C. D. Melvin

Much of the work reported in the literature on cellulose acetate reverse osmosis membranes has raised new and important questions with regard to the dense or “active” layer of these membranes. Several thickness values and structures have been attributed to the dense layer. To ensure the correct interpretation of the cellulose acetate structure thirteen different preparative techniques have been used in this investigation. These thirteen methods included various combinations of water substitution, freeze drying, freeze sectioning, fracturing, embedding, and microtomy techniques with both transmission and scanning electron microscope observations.It was observed that several factors can cause a distortion of the structure during sample preparation. The most obvious problem of water removal can cause swelling, shrinking, and folds. Improper removal of embedding materials, when used, can cause a loss of electron image contrast and, or structure which could hinder interpretation.


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