Created
May 27, 2014 16:08
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Heat Index
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| /// <summary> | |
| /// Calculates the heat index | |
| /// </summary> | |
| /// <param name="t">Temperature in Fahrenheit</param> | |
| /// <param name="rh">Relative humidity (0..1)</param> | |
| /// <returns>Heat Index in Fahrenheit</returns> | |
| public double GetHeatIndex(double t, double rh) | |
| { | |
| if (rh < 0 || rh > 1) | |
| throw new ArgumentOutOfRangeException("rh", "Relative Humidity must be between 0 and 1"); | |
| if (t >= 80 && rh >= .40) | |
| { | |
| //for temp>=80F and rh>=40%, this formula is +/- 1.3F accurate | |
| return -42.379 + 2.04901523 * t + 10.14333127 * rh - 0.22475541 * t * rh - 6.83783E-3 * t * t - | |
| 5.481717E-2 * rh * rh - 1.22874E-3 * t * t * rh + 8.5282E-4 * t * rh * rh - 1.99E-6 * t * t * rh * rh; | |
| } | |
| else | |
| { | |
| //An alternative set of constants for this equation that is within 3 degrees of the national weather service | |
| //for all humidities from 0 to 80% and all temperatures between 70 and 115 °F and all heat indexes < 150 °F is | |
| return -0.363445176 + .988622465 * t + 4.777114035 * rh - 0.114037667 * t * rh - 0.000850208 * t * t - | |
| 0.020716198 * rh * rh - 0.000687678 * t * t * rh + 0.000274954 * t * rh * rh; // - 0 * t * t * rh * rh; | |
| } | |
| } |
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