Wind Turbine Shadow Calculator
Do not operate the form until this page and its programme have loaded completely. Otherwise the program will complain about missing data, and you will have to click Reload. This calculator lets you experiment with your local conditions to determine the shape and size of the local area which may be affected by shade (light flicker) from a wind turbine. For an actual project you will probably want professional wind project software which will help you with a lot of other aspects as well. (See the
Links
section).
After changing data, use the tab key, click the Calculate button, or click anywhere on the page outside the field you have updated to get the results in the right column. To get a plot image, click on the Plot button. Click on the question marks for help. (If a plot windows disappears, it is probably hidden behind this window).
CALCULATOR
Location
Select:
Select Location
Amsterdam
Anchorage
Ankara
Athens
Beijing
Berlin
Bombay
Boston
Boulder
Brussels
Cairo
Canberra
Cape Town
Chicago
Christiansø *)
Copenhagen *)
Dallas
Dublin
Edinburgh
Esbjerg
Helsinki
Hong Kong
Honolulu
Lisboa
London
Madrid
Manila
Melbourne
Mexico City
Montreal
Moscow
New Delhi
New York
Nuuk
Oslo
Ottawa
Paris
Perth
Reykjavik
Rio de Janeiro
Rome
San Francisco
Seattle
Shanghai
Singapore
Stockholm
Thorshavn
Thule
Tokyo
Viborg *)
Warsaw
Wellington
Zurich
Other
or type
°
' latitude
North
South
°
' longitude
East
West
Time Zone
° time zone meridian
East
West
or GMT
+
-
0
1
2
3
4
5
6
7
8
9
10
11
12
:
00
30
Time
day
month
time (0:00-23:59)
:
Daylight saving time
Wind Turbine
m hub height,
m rotor diameter
Results this Day
Sunrise
:
Noon
:
Sunset
:
Declination
°
Sunrise/sunset duration
min.
sec.
Results this Minute
Solar azimuth
°
Solar altitude
°
Direction from the sun
(East, North, Up coordinates)
Shadow Plot
this...
minute
hour
day
month
year, step
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
20
30
40
60
minute(s)
Plot area height
width
pixels, resolution =
m per
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
pixels
Rotor direction (azimuth)
random
worst case (Darrieus)
facing azimuth
° =
N/S
NNW/SSE
NW/SE
WNW/ESE
W/E
WSW/ENE
SW/NE
SSW/NNE
Other
use wind rose table below
Turbine running
% of the daytime. Max. distance
m
Sunshine
% of the time OR check here
to use monthly sunshine hours from table below.
Include mouse sensitive shadow duration readout (only useful if used with an I.E. 4 browser)
*)= Cities marked with an asterisk in the city popup menu include sunshine and wind rose data for the tables below.
Bright Sunshine Table
Wind Rose Table
Month
Daytime
Hours
Bright
Sunshine
Hours
Bright
Sunshine
per cent
using
8
12
16
directions
wind rose sector (not azimuth) %
January
°
February
°
March
°
April
°
May
°
June
°
July
°
August
°
September
Total ... ... ...
October
Total must be 100%
November
December
Year Total
Daytime hours are computed automatically by this programme.
Source for bright sunshine hours:
To print the results of the plotter programme you should make a
screen dump
© Copyright 1997-2003 Danish Wind Industry Association
Updated 10 May 2003
http://www.windpower.org/en/tour/env/shadow/shadowc.htm
Please wait...