JAPAN

1. JAPAN

2. Company/Organization – Sanze shoreline gully Technology/Plant Name - Sanze shoreline gully Technology Genre - OWC - Near-shore Power take-off system – Air Turbine Shoreline gullies are naturally tapered channels, and an oscillating water column (OWC) at the head of such a gully is exposed to higher wave power densities than those found at the gully’s mouth. Systems based on this principle have been built in several countries, primarily for testing pneumatic turbine designs. The Japanese version was a 40kW onshore unit that operated for six months at Sanze on the west coast of Japan before it was taken out of service in 1984. Ocean Wave Technologies

3. Company/Organization – Ministry of Transport Technology/Plant Name - The Sakata OWC Technology Genre - OWC - Near-shore Power take-off system – Air Turbine Another Japanese onshore fixed OWC system is based on caissons placed side-by-side in a breakwater configuration. Such an OWC has been developed by the Japanese Ministry of Transport under the direction of Yoshimi Goda & a 60 kW prototype has been installed as part of a new offshore breakwater built at Sakata Port on the west coast of Japan. The breakwater consists of a row of caissons on a rubble mound foundation, one of the caissons being built with a “curtain wall” that forms the OWC capture chamber. Ocean Wave Technologies

4. Company/Organization – JAMSTEC Technology/Plant Name - Mighty Whale OWC Technology Genre - OWC – Floating Power take-off system – Air Turbine The Marine Science & Technology Centre of Japan launched the world’s largest offshore floating wave power device in July 1998, and the full-scale prototype will be tested until the year 2000. This floating device, called the Mighty Whale, converts wave energy to electricity. The device measures 50 metres long by 30 metres wide, and uses waves in the Pacific Ocean to drive three air turbines (one with a rated output of 50 kW + 10 kW and two of 30 kW) on board the platform, to generate 120 kW of electricity. Ocean Wave Technologies

5. Ocean Wave Technologies Mighty Whale OWC

6. After being towed to its mooring about 1.5 km from the mouth of Gokasho Bay, the Mighty Whale was anchored to the bottom of the sea (about 40 m deep) with six mooring lines; four lines on the seaward side and two on the lee side. Mooring lines are designed to withstand typhoon winds, and the unit is designed to handle waves of 8 m. The Mighty Whale converts wave energy to electricity by using oscillating columns of water to drive air turbines. Waves flowing in and out of the air chambers at the ‘mouth’ of the Mighty Whale make  the water level in the chambers rise and fall. The water forces air into and out of the chambers through nozzles on the tops of the chambers. The resulting high-speed air-flows rotate air turbines which drive the generators. The Mighty Whale can be remotely controlled from on-shore. In the demonstration prototype, the energy produced is mostly used by the instruments carried on board; any surplus is used to charge a storage battery or, when this is fully charged, is used by a loading resistor. A safety valve protects the air turbines from stormy weather by shutting off the flow of air if the rotation speed of the turbines exceeds a predetermined level. So that it can be used in the future to improve water quality, the prototype is also equipped with an air compressor to provide aeration. Because it has absorbed and converted most of the energy in the wave, the Mighty Whale also creates calm sea space behind it, and this feature can be utilised; for example, to make areas suitable for fish farming and water sports. The structure of the Mighty Whale itself can be used as a weather monitoring station, a temporary mooring for small vessels or a recreational fishing platform. Ocean Wave Technologies

7. Company/Organization – Saga University Technology/Plant Name - Hybrid OTEC Technology Genre - OTEC Power take-off system – Other A hybrid cycle combines the features of both the closed-cycle and open-cycle systems. In a hybrid OTEC system, warm seawater enters a vacuum chamber where it is flash-evaporated into steam, which is similar to the open-cycle evaporation process. The steam vaporizes the working fluid of a closed-cycle loop on the other side of an ammonia vaporizer. The vaporized fluid then drives a turbine that produces electricity. The steam condenses within the heat exchanger and provides desalinated water. The electricity produced by the system can be delivered to a utility grid or used to manufacture methanol, hydrogen, refined metals, ammonia, and similar products. Now let's take a closer look at some of the main components of an OTEC system—specifically, the heat exchangers, evaporators, turbines, and condensers. Thermal Gradient Technologies

8. Company/Organization – Tokyo Electric, Kyushu Electric, Saga University Technology/Plant Name - Closed-Cycle OTEC Technology Genre - OTEC Power take-off system – Other In the closed-cycle OTEC system, warm seawater vaporizes a working fluid, such as ammonia, flowing through a heat exchanger (evaporator). The vapor expands at moderate pressures and turns a turbine coupled to a generator that produces electricity. The vapor is then condensed in another heat exchanger (condenser) using cold seawater pumped from the ocean's depths through a cold-water pipe. The condensed working fluid is pumped back to the evaporator to repeat the cycle. The working fluid remains in a closed system and circulates continuously. Thermal Gradient Technologies

9. Made By – • Narender – IX-A • Suman – IX-A • Sanpreet – IX-A • Monu – IX-A • Komal Singh – IX-A • Jagir Singh – IX-A • Isha – IX-A • Shalu – IX-A • Rohit – IX-A JAPAN