logo joomla

Embarquez avec des scientifiques, des ingénieurs et des marins pour une navigation-exploration des relations avec l'océan, le climat et les énergies marines dans la perspective du changement climatique 

IOA News Letters Summary

by
Isao Tatsumi
Chimizu Corporation
Japan

OTEC technology needs to be made more cost-effective.  The Ocean Thermal Energy Conversion Association (OTECA-Japan) has been studying methods of improving OTEC plant efficiency, the optimal design of intake pipeline equipment in deep water, and multi-purpose utilization in deep water.  This paper presents results from our development work on the intake pipeline system for the OTEC.  A feasibility study was conducted on a large-diameter pipeline for a 1000kw OTEC plant using inexpensive high-density polyethylene with heat insulation and corrosion-proof properties.  We introduced a floating pipeline system in order to avoid the need to conform to the sea floor.  Our fundamental research included; 1)simulation analysis to identify static and dynamic behaviors of the pipe in tidal waves and currents, 2)experiments to identify vibrational phenomena to the pipe produced by wave-current processes and flow in the pipe, 3)experiments to measure the properties of the polyethylene.  Our research indicates that this is likely suited for use in a deep water OTEC plant, although further structural study on the pipeline mooring sections and stress concentration is still needed.