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  by Phil Kopiske 23 February 2002

References: IEEE Transactions on Power Apparatus, V. PAS-102, No. 9, Sep 1983
Product: 100 kW shore-based OTEC
Cost: unknown
Cost Year: 1981
Output 1: 100 kW electricity net
Output 2: Cold nutrient-rich seawater for aquaculture and air conditioning
Input 1: 13.9 ft³/s surface seawater at 85.6 ºF (0.395 m³/s, 29.8 ºC)
Input 2: 13.5 ft³/s deep seawater at 44.6 ºF (0.382 m ³ /s, 7 ºC)
Size: unknown
Designer: Tokyo Electric Power Company / Toshiba Corporation
Technology: Closed Cycle Freon-22

Company: Tokyo Electric Power Company / Toshiba Corporation
Address: Tokyo, Japan
Phone: unknown
Web Site: unknown

In 1981, Tokyo Electric and Toshiba began construction on a 100 kW net OTEC. This third abstract is a brief description of the OTEC’s closed cycle design.

In operation, cold seawater at 5.9 ºC (42.6 ºF ) is drawn in through a 0.7 m (25.6 in) diameter, 945 m (1033 yard) long polyethylene pipe from a depth of 580 (634 yards) meters. The pipe is 3.5 cm (1.4 in) down to 270 m (886 ft) and 3.0 cm (1.2 in) from there down. Warm surface seawater at 29.8 ºC is used to evaporate Freon-22 in a shell and tube heat exchanger. The Freon vapor is expanded through a turbine to drive the electrical generator. An evaporator heat exchanger efficiency of 3500 kcal/m²hºC and a condenser efficiency of 2500 kcal/m ²hºC were achieved using copper sprayed titanium tubes in the evaporator, and fluted surface enhanced tubes in the condenser.

Data obtained during operation was used to design a 2.5 MW OTEC with the following characteristics:

References: IEEE Transactions on Power Apparatus, V. PAS-102, No. 9, Sep 1983
Product: 100 kW shore-based OTEC
Cost: unknown
Cost Year: unknown
Output 1: 2.5 MW electricity net
Output 2: Cold nutrient-rich seawater for aquaculture and air conditioning
Input 1: 259 ft³/s surface seawater at 85.6 ºF (7.33 m³/s, 29.8 ºC)
Input 2: 247 ft³/s deep seawater at 44.6 ºF (7 m ³ /s, 7 ºC)
Size: unknown
Designer: Tokyo Electric Power Company / Toshiba Corporation
Technology: Closed Cycle Freon-22

Company: Tokyo Electric Power Company / Toshiba Corporation
Address: Tokyo, Japan
Phone: unknown
Web Site: unknown

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