勇发彩票

Wind turbine
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Factors affecting the quality of wind power gear lubricating oil
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wind power
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Installation

     Installation for wind turbines below 10KW   Installation for wind turbines above 15KW    (请点击查看动画)
 

                                                Relation of wind speed and wind scale

Force

Speed

Name

Conditions
at Sea

Conditions
on Land

m/s

km/h

mi/h

 

 

 

0

0-0.2

< 2

< 1

Calm

Sea like a mirror.

Smoke rises vertically.

1

0.3-1.5

1-5

1-4

Light air

Ripples only.

Smoke drifts and leaves rustle.

2

1.6-3.3

6-11

5-7

Light breeze

Small wavelets (0.2 m). Crests have a glassy appearance.

Wind felt on face.

3

3.4-5.4

12-19

 8-11

Gentle breeze

Large wavelets (0.6 m), crests begin to break.

Flags extended, leaves move.

4

5.5-7.9

20-29

12-18

Moderate breeze

Small waves (1 m), some whitecaps.

Dust and small branches move.

5

8.0-10.7

30-39

19-24

Fresh breeze

Moderate waves (1.8 m), many whitecaps.

Small trees begin to sway.

6

10.8-13.8

40-50

25-31

Strong breeze

Large waves (3 m), probably some spray.

Large branches move, wires whistle, umbrellas are difficult to control.

7

13.9-17.1

51-61

32-38

Near gale

Mounting sea (4 m) with foam blown in streaks downwind.

Whole trees in motion, inconvenience in walking.

8

17.2-20.7

62-74

39-46

Gale

Moderately high waves (5.5 m), crests break into spindrift.

Difficult to walk against wind. Twigs and small branches blown off trees.

9

20.8-24.4

76-87

47-54

Strong gale

High waves (7 m), dense foam, visibility affected.

Minor structural damage may occur (shingles blown off roofs).

10

24.5-28.4

88-102

55-63

Storm

Very high waves (9 m), heavy sea roll, visibility impaired. Surface generally white.

Trees uprooted, structural damage likely.

11

28.4-33

103-118

64-73

Violent storm

Exceptionally high waves (11 m), visibility poor.

Widespread damage to structures.

12

>33

119+

74+

Hurricane

14 m waves, air filled with foam and spray, visibility bad.

Severe structural damage to buildings, wide spread devastation

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