Hi to everybody.

It seems to me, that both Ecotect and Weather Tool calculate in a wrong way both wind speed and wind direction.
Please let me explain what I've done:

I've downloaded from EnergyPlus Web Site an EPW file for Treviso, S.Angelo, Italy, to build up my WEA file.

It is to notice that EPW files measure wind speed within fixed steps of 1 m/sec and wind speed is then stored in the file in km/h as unit in a way like this: 3.6 - 7.2 - 10.8 - 14.4 and so on... There are no intermediate results.

I've then exported my WEA file into an Excel file to make some cross-analysis and here's where the problems arises.

Let me notice that both WEA and EPW files have 8760 entries (365 days x 24 hours).

I've then scripted a excel macro to extract for each hour and for each day wind direction and wind speed to make up a matrix (like a wind rose). I've cross-checked the results of Weather Tool with Excel's ones and some things don't match.

I'll be more specific. For this purpose I've attached my WEA file and my Excel file so you can check them out.

First: the sum of the wind hours from North Direction in Weather Tool doesn't match my Excel file, but all the other directions match. Why? Isn't that strange? My checksum of all the entries in excel says 8760 hours, so nothing is missed. Percentage numbers are right as well. Consequently, somethin's wrong with the Weather Tool?

Second: Weather Tools doesn't express wind speed in m/sec but in km/h and groups in an erratic way wind speed as you can see from my excel file.

I'll make an example: Weather Tool Vs. my Excel file for Wind Speed, From East Direction, Whole Year.
They read this way:
05-10 km/h 461 hrs but Excel reads this way: less then 3,6 km/h
10-15 km/h 42 hrs but Excel reads this way: 3.6-7.2 km/h
15-20 km/h 51 hrs but Excel reads this way: 7.2-14.4 km/h
20-25 km/h 7 hrs but Excel reads this way: 14.4-18.0 km/h
25-30 km/h 9 hrs but Excel reads this way: 18.0-21.6 km/h
30-35 km/h 8 hrs but Excel reads this way: 21.6-28.8 km/h
35-40 km/h 0 hrs but Excel reads this way: 28.8-32.4 km/h
40-45 km/h 2 hrs but Excel reads this way: 32.4-39.6 km/h
45-50 km/h 1 hrs but Excel reads this way: 39.6-43.2 km/h
>50 km/h 1 hrs
Sums 582 hrs for WeaTool and my Excel file.

So, my question is: am I doing something wrong or is there a bug in Weather Tool?

Thank you four answering me.

Best
Arch Mauro Bonotto