Temperature formulas (Heat Overlay): Difference between revisions
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==Wet-bulb Temperature formula== | ==Wet-bulb Temperature formula== | ||
<math>T_{w,t} = T_{a,t} \cdot \arctan | <math>T_{w,t} = T_{a,t} \cdot \arctan( 0.151977 \cdot \sqrt{\phi + 8.313659}) + \arctan (T_{a} + \phi) - \arctan(\phi - 1.676331) + 0.00391838 · \phi^{\frac{3}{2}} \arctan(0.023101 \cdot \phi) - 4.686935</math> | ||
where: | where: | ||
* T<sub>w,t</sub> is the calculated wet-bulb temperature; | * T<sub>w,t</sub> is the calculated wet-bulb temperature; | ||
Revision as of 13:26, 20 September 2019
Two temperature formulas are used in the calculation of the PET value:
Atmospheric Temperature formula
where
- is the calculated atmospheric temperature at time t;
- is the temperature measured at a weather station at time t;
- is the calculated Urban Heat Island effect at time t;
- is the sun daily motion factor at time t;
Wet-bulb Temperature formula
Failed to parse (syntax error): {\displaystyle T_{w,t} = T_{a,t} \cdot \arctan( 0.151977 \cdot \sqrt{\phi + 8.313659}) + \arctan (T_{a} + \phi) - \arctan(\phi - 1.676331) + 0.00391838 · \phi^{\frac{3}{2}} \arctan(0.023101 \cdot \phi) - 4.686935} where:
- Tw,t is the calculated wet-bulb temperature;
- Ta,t is the calculated atmospheric temperature;
- ϕ is the sun altitude angle;
See also
