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| import numpy as np | |
| def hli(irradiance : float, air_temperature : float, RH : float, wind_speed : float): | |
| """ | |
| Compute Heat Load Index (HLI), a thermal stress indicator for animals. | |
| Parameters | |
| ---------- | |
| irradiance : float | |
| Solar radiation [W.m-2] | |
| air_temperature : float | |
| Air temperature [°C] | |
| RH : float | |
| Relative humidity [%] | |
| wind_speed : float | |
| Wind speed [m.s-1] | |
| Returns | |
| ------- | |
| float | |
| Heat Load Index value. | |
| """ | |
| BGT = 0.01498*irradiance + 1.184*air_temperature - 0.0789*RH - 2.739 | |
| HLI = np.where(BGT >= 25, 1.55*BGT- 0.5*wind_speed + np.exp(2.4 - wind_speed)+8.62 + 0.38*RH, 1.30*BGT - wind_speed+10.66 + 0.28*RH) | |
| return HLI |