Performance of the heat exchangers of a 100-kW (Gross) OTEC plant

Journal Article · Tue May 01 04:00:00 EDT 1984 · J. Sol. Energy Eng.; (United States)

DOI:https://doi.org/10.1115/1.3267578· OSTI ID:6779815

Mochida, Y; Kawano, S; Miyoshi, M; Takahata, T

A power-generating test of the world's largest (100-kW gross power) ocean thermal energy conversion (OTEC) demonstration plant was conducted from October through December 1981 in the Republic of Nauru in the central Pacific Ocean. Fluorocarbon-22 was selected as a working fluid. During the power generating test, a maximum gross power output of 120-kW (31.5-kW net) was achieved. Continuous operation was maintained for ten days. This plant verified the results of various development tests that were conducted by the authors on the heat exchangers. The evaporator is a horizontal, shell-and-tube, pool-boiler with the titanium tubes enhanced by a flame-sprayed, porous copper coating on the outside. The condenser is a vertical shell-and-tube type with the titanium tubes fluted on the outside (working-fluid side). Overall heat transfer coefficients of approximately 4300 and 3000 W/m/sup 2/K for the evaporator and condenser, respectively, were achieved at the seawater design velocity of 2 m/s.

• Research Organization: Turbine Works, Toshiba Corporation, Yokohama
• OSTI ID: 6779815
• Journal Information: J. Sol. Energy Eng.; (United States), Journal Name: J. Sol. Energy Eng.; (United States) Vol. 106:2; ISSN JSEED
• Country of Publication: United States
• Language: English

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