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( 0.151977 \cdot \sqrt{\phi + 8.313659})+ \arctan (T_{a} + \phi) - \arctan(\phi - 1.676331) + 0.00391838 \cdot \phi^{\frac{3}{2}} \arctan(0.023101 \cdot \phi) - 4.686935</math> | <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 \cdot \phi^{\frac{3}{2}} \arctan(0.023101 \cdot \phi) - 4.686935</math> | ||
where: | where: | ||
* | * <math>T_{w,t}</math> is the calculated wet-bulb temperature; | ||
* | * <math>T_{a,t}</math> is the calculated atmospheric temperature; | ||
* | * <math>\phi</math> is the [[Sun_altitude_(Heat_Overlay)|sun altitude angle]]; | ||
==See also== | ==See also== | ||
* [https://en.wikipedia.org/wiki/Wet-bulb_temperature Wet-bulb temperature] | * [https://en.wikipedia.org/wiki/Wet-bulb_temperature Wet-bulb temperature] | ||
{{Template:HeatOverlay_formula_nav}} | {{Template:HeatOverlay_formula_nav}} | ||
Revision as of 13:30, 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
where:
- is the calculated wet-bulb temperature;
- is the calculated atmospheric temperature;
- is the sun altitude angle;
See also
