Optimization of a Closed-Cycle OTEC System

[+] Author and Article Information
Haruo Uehara

Saga University, Saga, 840, Japan

Yasuyuki Ikegami

Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga 816, Japan

J. Sol. Energy Eng 112(4), 247-256 (Nov 01, 1990) (10 pages) doi:10.1115/1.2929931 History: Received January 01, 1990; Revised June 01, 1990; Online June 06, 2008


Optimization of an Ocean Thermal Energy Conversion (OTEC) system is carried out by the Powell Method (the method of steepest descent). The parameters in the objective function consist of the velocities of cold sea water and warm sea water passing through the heat exchangers, the phase change temperature, and turbine configuration (specific speed, specific diameter, ratio of blade to diameter). Numerical results are shown for a 100-MW OTEC plant with plate-type heat exchangers using ammonia as working fluid, and are compared with calculation results for the case when the turbine efficiency is fixed.

Copyright © 1990 by The American Society of Mechanical Engineers
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