Windchill

[Andrea75]

Hi Antoine, I saw that in the setup there is an option to calculate in every condition the heat index and the windchill. I tried to set both, but only heat index works. The windchill continues to be calculated only with temperatures below 5°C.
There i a bug?

[TiToine]

What is the plugin? If your history contains already WC, HI, it's normal.

[Andrea75]

What is the plugin? If your history contains already WC, HI, it's normal.

I use WS2300 plugin, and yes, the WC value is on the history, but the values are different: while the WC now is shown on history, and in presence of wind is different (more low) from out temperature, on Graph Weather it follow the value of temperature.

[TiToine]

No, the WS2300 history. dat does not store the WC or HI. It should work...I use the WS2300 plugin and WC/HI with or without weather norms, and it works.

[Andrea75]

No, the WS2300 history. dat does not store the WC or HI. It should work...I use the WS2300 plugin and WC/HI with or without weather norms, and it works.

Uhmmmm... see this graphic:

graph2.png

As you can see with wind over 25-30 km/h, the line of WC is not showed... but the values on history are different:

history.PNG

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There are another problem (or bug) with WsWin plugin: the wind on the rose graphic is not showed correctly:

graph.png

The graphic is taken from the same day.

[jturlier]

As far as I remember windchill factor is calculated below 10°C and above -50°C

[Andrea75]

As far as I remember windchill factor is calculated below 10°C and above -50°C

If you follow norms (that in any case are a little bit different)... but the WS2300 calculate WC in any condition (watch the history).

[TiToine]

Can you send me you history generated by WSWin? The file WSXXXX.DAT

[Andrea75]

Attached here the history.dat....
There is few data on it, because the old history was corrupted, so I have had to reset it today... anyway you can see on this the value of wc that is different from temperature.

history8.rar

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Here there is the the .dat of Wswin

WD_08_08.rar

[TiToine]

I use the following model to compute the wind chill:
WC = 13.13f+0.62f*OT-13.95f*powf(WS,0.16f)+0.486f*OT*powf(WS,0.16f);
The WC Twc computed for a temperature T gives Twc > T. It does not make sense, and internally GW set the Twc to T.
It seems HW use another model.
In all cases, I think to have WC and HI on the same graphic does not make sens.

For the wind direction WSWin encode the wind direction as integer and flush the decimal. A wind direction of 22.5 degrees is encoded as 22 degrees. I have to modify something to fix the problem, so in next release.

[Andrea75]

The problem of wind direction in Wswin plugin is solved with last version! Thanks Antoine.