meteohub.de

Posted: **Tue Oct 24, 2023 3:11 pm**

Ι would like you to please inform me about the minimum values that Temperature, Humidity and Dew point must have in order to calculate the heat index from meteobridge.

I notice that in meteobridge the value of the Heat Index is almost always equal to the outside temperature!

I should stress that the Weatherlink program always calculates the Heat Index for every value of temperature, humidity, and dew point!

Thanks

My system is
Platform: Raspberry Pi 4 Model B (4GB RAM)
Storage: ATP SLC 2GB
SWversion: Meteobridge 5.7 (Oct 18 2023, build 3047), FW 1.3
Weather Station: Davis Vantage Vue with data logger and weatherlink software

Posted: **Wed Oct 25, 2023 1:28 am**

Code: Select all

double heatindexfloat (double temp, double hum)
{
  double t, t2;
  double h, h2;

  t = C2F (temp);
  t2 = t * t;
  h = hum;
  h2 = h * h;

  if ((t >= 80.0) && (hum >= 40.0))
    return F2C (-42.379 + (2.04901523 * t) + (10.14333127 * h) - (0.22475541 * h * t)
                - (0.00683783 * t2) - (0.05481717 * h2) + (0.00122874 * t2 * h)
                + (0.00085282 * t * h2) - (0.00000199 * t2 * h2));
  else
    return temp;
}

: Bildschirmfoto 2023-10-25 um 01.31.53.png (204.49 KiB) Viewed 900 times

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Heat Index calculation from meteobridge

Heat Index calculation from meteobridge

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