Title：Toward the Practical Use of Wave Energy Conversion Wave Energy Conversion Utilizing Vertical Motion of Water in the Array of Water Chambers Aligned in the Direction of Wave Propagation
Time：Nov. 9, 2015（Monday） 13:30-15:00
Venue：Lecture Hall，Environmental Science Building
Practical use of wave energy conversion requires that all of the following conditions are satisfied: (1) survivability of the device which is attained only if severe wave load on the any part of the device is avoided; (2) workability in installation and maintenance operations; (3) high energy conversion potential; and (4) low cost. In order to meet these conditions, the first author designed the system which consists of water chambers array aligned along the wave propagation direction and the float-type wave energy converters, each of which is installed in the chamber and utilizes the gentle up/down motion of the water in the chamber. In this system, neither the wall(s) of the chambers nor the energy conversion device(s) are exposed to the impulsive load due to water wave. Also since this system is profitable when set along the jetty or along a long floating body, installation and maintenance are done without difficulty and the cost is reduced. Waves near the jetty or a loosely moored long floating body will propagate toward the length of these structures. Therefore, an array of water chambers set along the jetty or a long floating structure is profitable in the sense that the outer wall is never exposed to severe wave loads. Furthermore, the float-type wave energy converter utilizing the up/down motion of the water has high potential for energy conversion. Therefore, this system can be considered as one of the most reasonable systems. In this paper, we describe the system which consists of a float, a shaft connected with another shaft, a rack and pinion arrangement, a ratchet mechanism, and rotary type generator(s). Then, we present the dynamics model for evaluating the output electric power, and the results of numerical calculation including the effect of the phase shift of up/down motion of the water in the array of water chambers aligned along the direction of wave propagation.
Introduction of the Lecturer:
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