Model
W03
Testimonials.
In
the end, it is what our customers say that really matters.
Here are the comments of some of them:
Johnny
Hanekom, Keetmanshoop, Namibia: The two (2) machines that I've bought, exceed all my expectations
as far as power generation is concerned. I am really pleased
with their performance, and I am planning to buy the third
unit.
Johnny
van der Linde, Groblershoop: We
are retired on our farm outside Groblershoop, and have
always experienced a shortage of electricity from the
solar panels we had. With our Winglette wind generator
now installed, we are seeking ways to utilize the abundance
of power that available now! |
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————Power
production...
At
this stage, one would like to ask oneself: "How much
power can I expect to generate with my Winglete wind
generator..?"
Because
power production of any wind generator is directly proportional wind
conditions, wind data can be helpful to answer this
question. Depending
on the size of the project you envision, you may want to
do a “wind resource assessment” at
the proposed site, since wind is affected by subtle variations
in landscape and tree growth.
On
one end of the scale, this wind resource assessment may involve
a simple visual inspection backed up by existing wind
data (e.g. from the Canadian, or American Wind Atlas, or
from data obtainable from the South African weather Bureau,
for the southern parts of Africa).
On
the other end of the scale you might want to purchase an
anemometer, that can take precise wind measurements for up
to a year. It depends on how much you want to spend and how
accurate you want your data to be.
For
our purposes, we will stay with the first approach, and find
data for the region where one wants to install the Winglette.
(Note: The figures in the following tables, represent only
a general indication of the power production that you may
expect. They are no guarantee of exact power generation values.)
Southern
Africa:
For all installations in the Southern parts of Africa,
a Wind Atlas has been prepared, that is display as follows.
From
this chart it can be seen that the area is divided into four
(4) wind zones. You can find the zone that complies to the
site where you want to install your Winglette wind
generator. The table below, summaries the expected daily
power production for the 3 kWatt Winglette,
for different tower heights.
For
example: If you want to install a machine on your farm in
the Beaufort West district, which is in zone 2,
the expected power production of your Winglette on
a 18m tower, will be 16.2 kWatt-hour per day.
EXPECTED
DAILY POWER PRODUCTION
FOR DIFFERENT TOWERS HEIGHTS in (kWatt-hours/day).
Zone |
12m |
15m |
18m |
24m |
30m |
1 |
21.7 |
24.0 |
26.6 |
29.1 |
33.4 |
2 |
12.1 |
13.5 |
16.2 |
18.6 |
20.6 |
3 |
9.0 |
10.0 |
12.0 |
13.8 |
15.3 |
4 |
7.6 |
8.4 |
10.2 |
11.7 |
12.9 |
Other
parts of the World:
Wind Atlases, exist for all other countries in the World. To
help your with power production estimates, we have prepared
the following table, with figures, for different average wind
speeds, in meters per second (m/s).
For
example: If you want to install a machine on your farm in
an area where the average wind speed is 6 m/s, the table
shows that the expected power production of your Winglette, on
a 18m tower, will be 15.7 kWatt-hour per day.
EXPECTED
DAILY POWER PRODUCTION
FOR
DIFFERENT TOWERS HEIGHTS in (kWatt-hours/day).
|
12m |
15m |
18m |
24m |
30m |
4 |
6.7 |
7.4 |
9.0 |
10.3 |
11.4 |
5 |
11.8 |
13.1 |
15.8 |
18.1 |
19.9 |
6 |
18.1 |
20.1 |
24.3 |
27.8 |
30.7 |
7 |
24.8 |
27.6 |
33.2 |
38.1 |
42.1 |
Practical
considerations:
Over
and above, looking at available wind data and a Wind Atlas,
a import aspect of your wind resource assessment, involve
a simple visual inspection of
the site, where that machine will be located. We therefore
want to remind you of the following factors that have been
dealt with, at the page on wind conditions:
- Surface
roughness. High
above the ground level, the wind is hardly influenced
by the surface of the earth. At lower levels the wind
is greatly retarded by surface conditions like trees,
buildings, and all kinds of vegetation. The more pronounced
the roughness of the surface, the more will the wind
be slowed down. If you site has rough surface areas, go
for a higher tower to
avoid gustier winds.
- Turbulence. Not
only surface conditions, like trees and buildings causes
turbulence, but changes in the weather patterns, day time
and night time, and uneven terrain. Turbulence decreases
the possibility of using the energy in the wind effectively
for your Winglette wind generator. It also
impose tear and wear on your machine. So,
minimize turbulence.
- Obstacles. Obstacles,
like buildings, and trees, decreases the wind speed down
stream from the obstacle. The slow down of the wind increases
with the height and width of such an obstacle. So, stay
upwind of any obstacles. If downwind side of
obstacles, consider a higher tower. Remember, trees keep
on growing taller, towers not.
These are some considerations to take into account when doing
a wind assessment for your Winglette wind
generator. Take your time to weigh all factors properly.
You will be rewarded with a system that takes the best
advantage of one of our free gifts on
Earth... the Wind.
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