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By Jacques Constans (Auth.)

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Example text

The main advantages of the Darrieus rotor are: simple tower construction which can be supported with guy wires from the top, delivers mechanical power at ground level, requires no pitch control for synchronous appli­ cation , exhibits a low center of gravity, which is a definite advantage for installation offshore on floating plat­ forms. The main disadvantages are: It has not yet been tested in large scale appli­ cations. The aerodynamic efficiency is conventional propeller. smaller than for a The biggest Darrieus rotor built is the 200 kw plant, which is installed in Isle Magdalene, about 24 available.

5. The rotor weight and the tower weight for a corresponding HA rotor 5. are Because of lower s t r e s s e s , t h e rotor and t h e tower weight a r e lower. higher. 6. U R /V = 5 - 1 0 Vj = V ( l - a) 6. 25 For definition of symbols, see figure 1 . 4 ( B ) . 4(A). of symbols see figure (continued) Table 1. 7. Rotor efficiency (77) = 0 . 6 . (Continued) 7. 60; e n e r g y e x ­ change is less efficient 8. The pitch varying wind angle ratio speed of to may be varied rotational extract the with speed t h a n for a HA r o t o r .

MARINE SOURCES OF ENERGY 44 turbine demister to generator ammonia warm water ■ inlet cold water inlet Fig. 6. In the open Closed Rankine Cycle System. cycle the operating fluid is the warm sea water itself, while in the closed cycle the working medium is a suitable fluid ( i . e . , ammonia, p r o p a n e ) .

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